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Add HDCP support to i915 drm driver.

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Merge tag 'topic/hdcp-2018-02-13' of git://anongit.freedesktop.org/drm/drm-misc into drm-next

Add HDCP support to i915 drm driver.

* tag 'topic/hdcp-2018-02-13' of git://anongit.freedesktop.org/drm/drm-misc: (26 commits)
  drm/i915: fix misalignment in HDCP register def
  drm/i915: Reauthenticate HDCP on failure
  drm/i915: Detect panel's hdcp capability
  drm/i915: Optimize HDCP key load
  drm/i915: Retry HDCP bksv read
  drm/i915: Connector info in HDCP debug msgs
  drm/i915: Stop encryption for repeater with no sink
  drm/i915: Handle failure from 2nd stage HDCP auth
  drm/i915: Downgrade hdcp logs from INFO to DEBUG_KMS
  drm/i915: Restore HDCP DRM_INFO when with no downstream
  drm/i915: Check for downstream topology errors
  drm/i915: Start repeater auth on READY/CP_IRQ
  drm/i915: II stage HDCP auth for repeater only
  drm/i915: Extending HDCP for HSW, BDW and BXT+
  drm/i915/dp: Fix compilation of intel_dp_hdcp_check_link
  drm/i915: Only disable HDCP when it's active
  drm/i915: Don't allow HDCP on PORT E/F
  drm/i915: Implement HDCP for DisplayPort
  drm/i915: Implement HDCP for HDMI
  drm/i915: Add function to output Aksv over GMBUS
  ...
This commit is contained in:
Dave Airlie 2018-02-16 09:36:04 +10:00
commit 933519a5a2
19 changed files with 1820 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/drm/drm_atomic.c
View File

@ -1224,6 +1224,12 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector,
state->picture_aspect_ratio = val;
} else if (property == connector->scaling_mode_property) {
state->scaling_mode = val;
} else if (property == connector->content_protection_property) {
if (val == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
DRM_DEBUG_KMS("only drivers can set CP Enabled\n");
return -EINVAL;
}
state->content_protection = val;
} else if (connector->funcs->atomic_set_property) {
return connector->funcs->atomic_set_property(connector,
state, property, val);
@ -1303,6 +1309,8 @@ drm_atomic_connector_get_property(struct drm_connector *connector,
*val = state->picture_aspect_ratio;
} else if (property == connector->scaling_mode_property) {
*val = state->scaling_mode;
} else if (property == connector->content_protection_property) {
*val = state->content_protection;
} else if (connector->funcs->atomic_get_property) {
return connector->funcs->atomic_get_property(connector,
state, property, val);

87
drivers/gpu/drm/drm_connector.c
View File

@ -761,6 +761,13 @@ static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] = {
DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name,
drm_tv_subconnector_enum_list)
static struct drm_prop_enum_list drm_cp_enum_list[] = {
{ DRM_MODE_CONTENT_PROTECTION_UNDESIRED, "Undesired" },
{ DRM_MODE_CONTENT_PROTECTION_DESIRED, "Desired" },
{ DRM_MODE_CONTENT_PROTECTION_ENABLED, "Enabled" },
};
DRM_ENUM_NAME_FN(drm_get_content_protection_name, drm_cp_enum_list)
/**
* DOC: standard connector properties
*
@ -822,14 +829,50 @@ DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name,
* should update this value using drm_mode_connector_set_tile_property().
* Userspace cannot change this property.
* link-status:
* Connector link-status property to indicate the status of link. The default
* value of link-status is "GOOD". If something fails during or after modeset,
* the kernel driver may set this to "BAD" and issue a hotplug uevent. Drivers
* should update this value using drm_mode_connector_set_link_status_property().
* Connector link-status property to indicate the status of link. The
* default value of link-status is "GOOD". If something fails during or
* after modeset, the kernel driver may set this to "BAD" and issue a
* hotplug uevent. Drivers should update this value using
* drm_mode_connector_set_link_status_property().
* non_desktop:
* Indicates the output should be ignored for purposes of displaying a
* standard desktop environment or console. This is most likely because
* the output device is not rectilinear.
* Content Protection:
* This property is used by userspace to request the kernel protect future
* content communicated over the link. When requested, kernel will apply
* the appropriate means of protection (most often HDCP), and use the
* property to tell userspace the protection is active.
*
* Drivers can set this up by calling
* drm_connector_attach_content_protection_property() on initialization.
*
* The value of this property can be one of the following:
*
* - DRM_MODE_CONTENT_PROTECTION_UNDESIRED = 0
* The link is not protected, content is transmitted in the clear.
* - DRM_MODE_CONTENT_PROTECTION_DESIRED = 1
* Userspace has requested content protection, but the link is not
* currently protected. When in this state, kernel should enable
* Content Protection as soon as possible.
* - DRM_MODE_CONTENT_PROTECTION_ENABLED = 2
* Userspace has requested content protection, and the link is
* protected. Only the driver can set the property to this value.
* If userspace attempts to set to ENABLED, kernel will return
* -EINVAL.
*
* A few guidelines:
*
* - DESIRED state should be preserved until userspace de-asserts it by
* setting the property to UNDESIRED. This means ENABLED should only
* transition to UNDESIRED when the user explicitly requests it.
* - If the state is DESIRED, kernel should attempt to re-authenticate the
* link whenever possible. This includes across disable/enable, dpms,
* hotplug, downstream device changes, link status failures, etc..
* - Userspace is responsible for polling the property to determine when
* the value transitions from ENABLED to DESIRED. This signifies the link
* is no longer protected and userspace should take appropriate action
* (whatever that might be).
*
* Connectors also have one standardized atomic property:
*
@ -1130,6 +1173,42 @@ int drm_connector_attach_scaling_mode_property(struct drm_connector *connector,
}
EXPORT_SYMBOL(drm_connector_attach_scaling_mode_property);
/**
* drm_connector_attach_content_protection_property - attach content protection
* property
*
* @connector: connector to attach CP property on.
*
* This is used to add support for content protection on select connectors.
* Content Protection is intentionally vague to allow for different underlying
* technologies, however it is most implemented by HDCP.
*
* The content protection will be set to &drm_connector_state.content_protection
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_connector_attach_content_protection_property(
struct drm_connector *connector)
{
struct drm_device *dev = connector->dev;
struct drm_property *prop;
prop = drm_property_create_enum(dev, 0, "Content Protection",
drm_cp_enum_list,
ARRAY_SIZE(drm_cp_enum_list));
if (!prop)
return -ENOMEM;
drm_object_attach_property(&connector->base, prop,
DRM_MODE_CONTENT_PROTECTION_UNDESIRED);
connector->content_protection_property = prop;
return 0;
}
EXPORT_SYMBOL(drm_connector_attach_content_protection_property);
/**
* drm_mode_create_aspect_ratio_property - create aspect ratio property
* @dev: DRM device

1
drivers/gpu/drm/i915/Makefile
View File

@ -109,6 +109,7 @@ i915-y += intel_audio.o \
intel_fbc.o \
intel_fifo_underrun.o \
intel_frontbuffer.o \
intel_hdcp.o \
intel_hotplug.o \
intel_modes.o \
intel_overlay.o \

1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -3661,6 +3661,7 @@ extern int intel_setup_gmbus(struct drm_i915_private *dev_priv);
extern void intel_teardown_gmbus(struct drm_i915_private *dev_priv);
extern bool intel_gmbus_is_valid_pin(struct drm_i915_private *dev_priv,
unsigned int pin);
extern int intel_gmbus_output_aksv(struct i2c_adapter *adapter);
extern struct i2c_adapter *
intel_gmbus_get_adapter(struct drm_i915_private *dev_priv, unsigned int pin);

85
drivers/gpu/drm/i915/i915_reg.h
View File

@ -3074,6 +3074,7 @@ enum i915_power_well_id {
# define GPIO_DATA_PULLUP_DISABLE (1 << 13)
#define GMBUS0 _MMIO(dev_priv->gpio_mmio_base + 0x5100) /* clock/port select */
#define GMBUS_AKSV_SELECT (1<<11)
#define GMBUS_RATE_100KHZ (0<<8)
#define GMBUS_RATE_50KHZ (1<<8)
#define GMBUS_RATE_400KHZ (2<<8) /* reserved on Pineview */
@ -8165,6 +8166,7 @@ enum {
#define GEN9_MEM_LATENCY_LEVEL_1_5_SHIFT 8
#define GEN9_MEM_LATENCY_LEVEL_2_6_SHIFT 16
#define GEN9_MEM_LATENCY_LEVEL_3_7_SHIFT 24
#define SKL_PCODE_LOAD_HDCP_KEYS 0x5
#define SKL_PCODE_CDCLK_CONTROL 0x7
#define SKL_CDCLK_PREPARE_FOR_CHANGE 0x3
#define SKL_CDCLK_READY_FOR_CHANGE 0x1
@ -8480,6 +8482,88 @@ enum skl_power_gate {
#define CNL_AUX_ANAOVRD1_ENABLE (1<<16)
#define CNL_AUX_ANAOVRD1_LDO_BYPASS (1<<23)
/* HDCP Key Registers */
#define HDCP_KEY_CONF _MMIO(0x66c00)
#define HDCP_AKSV_SEND_TRIGGER BIT(31)
#define HDCP_CLEAR_KEYS_TRIGGER BIT(30)
#define HDCP_KEY_LOAD_TRIGGER BIT(8)
#define HDCP_KEY_STATUS _MMIO(0x66c04)
#define HDCP_FUSE_IN_PROGRESS BIT(7)
#define HDCP_FUSE_ERROR BIT(6)
#define HDCP_FUSE_DONE BIT(5)
#define HDCP_KEY_LOAD_STATUS BIT(1)
#define HDCP_KEY_LOAD_DONE BIT(0)
#define HDCP_AKSV_LO _MMIO(0x66c10)
#define HDCP_AKSV_HI _MMIO(0x66c14)
/* HDCP Repeater Registers */
#define HDCP_REP_CTL _MMIO(0x66d00)
#define HDCP_DDIB_REP_PRESENT BIT(30)
#define HDCP_DDIA_REP_PRESENT BIT(29)
#define HDCP_DDIC_REP_PRESENT BIT(28)
#define HDCP_DDID_REP_PRESENT BIT(27)
#define HDCP_DDIF_REP_PRESENT BIT(26)
#define HDCP_DDIE_REP_PRESENT BIT(25)
#define HDCP_DDIB_SHA1_M0 (1 << 20)
#define HDCP_DDIA_SHA1_M0 (2 << 20)
#define HDCP_DDIC_SHA1_M0 (3 << 20)
#define HDCP_DDID_SHA1_M0 (4 << 20)
#define HDCP_DDIF_SHA1_M0 (5 << 20)
#define HDCP_DDIE_SHA1_M0 (6 << 20) /* Bspec says 5? */
#define HDCP_SHA1_BUSY BIT(16)
#define HDCP_SHA1_READY BIT(17)
#define HDCP_SHA1_COMPLETE BIT(18)
#define HDCP_SHA1_V_MATCH BIT(19)
#define HDCP_SHA1_TEXT_32 (1 << 1)
#define HDCP_SHA1_COMPLETE_HASH (2 << 1)
#define HDCP_SHA1_TEXT_24 (4 << 1)
#define HDCP_SHA1_TEXT_16 (5 << 1)
#define HDCP_SHA1_TEXT_8 (6 << 1)
#define HDCP_SHA1_TEXT_0 (7 << 1)
#define HDCP_SHA_V_PRIME_H0 _MMIO(0x66d04)
#define HDCP_SHA_V_PRIME_H1 _MMIO(0x66d08)
#define HDCP_SHA_V_PRIME_H2 _MMIO(0x66d0C)
#define HDCP_SHA_V_PRIME_H3 _MMIO(0x66d10)
#define HDCP_SHA_V_PRIME_H4 _MMIO(0x66d14)
#define HDCP_SHA_V_PRIME(h) _MMIO((0x66d04 + h * 4))
#define HDCP_SHA_TEXT _MMIO(0x66d18)
/* HDCP Auth Registers */
#define _PORTA_HDCP_AUTHENC 0x66800
#define _PORTB_HDCP_AUTHENC 0x66500
#define _PORTC_HDCP_AUTHENC 0x66600
#define _PORTD_HDCP_AUTHENC 0x66700
#define _PORTE_HDCP_AUTHENC 0x66A00
#define _PORTF_HDCP_AUTHENC 0x66900
#define _PORT_HDCP_AUTHENC(port, x) _MMIO(_PICK(port, \
_PORTA_HDCP_AUTHENC, \
_PORTB_HDCP_AUTHENC, \
_PORTC_HDCP_AUTHENC, \
_PORTD_HDCP_AUTHENC, \
_PORTE_HDCP_AUTHENC, \
_PORTF_HDCP_AUTHENC) + x)
#define PORT_HDCP_CONF(port) _PORT_HDCP_AUTHENC(port, 0x0)
#define HDCP_CONF_CAPTURE_AN BIT(0)
#define HDCP_CONF_AUTH_AND_ENC (BIT(1) | BIT(0))
#define PORT_HDCP_ANINIT(port) _PORT_HDCP_AUTHENC(port, 0x4)
#define PORT_HDCP_ANLO(port) _PORT_HDCP_AUTHENC(port, 0x8)
#define PORT_HDCP_ANHI(port) _PORT_HDCP_AUTHENC(port, 0xC)
#define PORT_HDCP_BKSVLO(port) _PORT_HDCP_AUTHENC(port, 0x10)
#define PORT_HDCP_BKSVHI(port) _PORT_HDCP_AUTHENC(port, 0x14)
#define PORT_HDCP_RPRIME(port) _PORT_HDCP_AUTHENC(port, 0x18)
#define PORT_HDCP_STATUS(port) _PORT_HDCP_AUTHENC(port, 0x1C)
#define HDCP_STATUS_STREAM_A_ENC BIT(31)
#define HDCP_STATUS_STREAM_B_ENC BIT(30)
#define HDCP_STATUS_STREAM_C_ENC BIT(29)
#define HDCP_STATUS_STREAM_D_ENC BIT(28)
#define HDCP_STATUS_AUTH BIT(21)
#define HDCP_STATUS_ENC BIT(20)
#define HDCP_STATUS_RI_MATCH BIT(19)
#define HDCP_STATUS_R0_READY BIT(18)
#define HDCP_STATUS_AN_READY BIT(17)
#define HDCP_STATUS_CIPHER BIT(16)
#define HDCP_STATUS_FRAME_CNT(x) ((x >> 8) & 0xff)
/* Per-pipe DDI Function Control */
#define _TRANS_DDI_FUNC_CTL_A 0x60400
#define _TRANS_DDI_FUNC_CTL_B 0x61400
@ -8511,6 +8595,7 @@ enum skl_power_gate {
#define TRANS_DDI_EDP_INPUT_A_ONOFF (4<<12)
#define TRANS_DDI_EDP_INPUT_B_ONOFF (5<<12)
#define TRANS_DDI_EDP_INPUT_C_ONOFF (6<<12)
#define TRANS_DDI_HDCP_SIGNALLING (1<<9)
#define TRANS_DDI_DP_VC_PAYLOAD_ALLOC (1<<8)
#define TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE (1<<7)
#define TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ (1<<6)

2
drivers/gpu/drm/i915/intel_atomic.c
View File

@ -110,6 +110,8 @@ int intel_digital_connector_atomic_check(struct drm_connector *conn,
to_intel_digital_connector_state(old_state);
struct drm_crtc_state *crtc_state;
intel_hdcp_atomic_check(conn, old_state, new_state);
if (!new_state->crtc)
return 0;

36
drivers/gpu/drm/i915/intel_ddi.c
View File

@ -1615,6 +1615,35 @@ void intel_ddi_disable_transcoder_func(struct drm_i915_private *dev_priv,
I915_WRITE(reg, val);
}
int intel_ddi_toggle_hdcp_signalling(struct intel_encoder *intel_encoder,
bool enable)
{
struct drm_device *dev = intel_encoder->base.dev;
struct drm_i915_private *dev_priv = to_i915(dev);
enum pipe pipe = 0;
int ret = 0;
uint32_t tmp;
if (WARN_ON(!intel_display_power_get_if_enabled(dev_priv,
intel_encoder->power_domain)))
return -ENXIO;
if (WARN_ON(!intel_encoder->get_hw_state(intel_encoder, &pipe))) {
ret = -EIO;
goto out;
}
tmp = I915_READ(TRANS_DDI_FUNC_CTL(pipe));
if (enable)
tmp |= TRANS_DDI_HDCP_SIGNALLING;
else
tmp &= ~TRANS_DDI_HDCP_SIGNALLING;
I915_WRITE(TRANS_DDI_FUNC_CTL(pipe), tmp);
out:
intel_display_power_put(dev_priv, intel_encoder->power_domain);
return ret;
}
bool intel_ddi_connector_get_hw_state(struct intel_connector *intel_connector)
{
struct drm_device *dev = intel_connector->base.dev;
@ -2465,6 +2494,11 @@ static void intel_enable_ddi(struct intel_encoder *encoder,
intel_enable_ddi_hdmi(encoder, crtc_state, conn_state);
else
intel_enable_ddi_dp(encoder, crtc_state, conn_state);
/* Enable hdcp if it's desired */
if (conn_state->content_protection ==
DRM_MODE_CONTENT_PROTECTION_DESIRED)
intel_hdcp_enable(to_intel_connector(conn_state->connector));
}
static void intel_disable_ddi_dp(struct intel_encoder *encoder,
@ -2499,6 +2533,8 @@ static void intel_disable_ddi(struct intel_encoder *encoder,
const struct intel_crtc_state *old_crtc_state,
const struct drm_connector_state *old_conn_state)
{
intel_hdcp_disable(to_intel_connector(old_conn_state->connector));
if (intel_crtc_has_type(old_crtc_state, INTEL_OUTPUT_HDMI))
intel_disable_ddi_hdmi(encoder, old_crtc_state, old_conn_state);
else

4
drivers/gpu/drm/i915/intel_display.c
View File

@ -15297,6 +15297,10 @@ static void intel_hpd_poll_fini(struct drm_device *dev)
for_each_intel_connector_iter(connector, &conn_iter) {
if (connector->modeset_retry_work.func)
cancel_work_sync(&connector->modeset_retry_work);
if (connector->hdcp_shim) {
cancel_delayed_work_sync(&connector->hdcp_check_work);
cancel_work_sync(&connector->hdcp_prop_work);
}
}
drm_connector_list_iter_end(&conn_iter);
}

277
drivers/gpu/drm/i915/intel_dp.c
View File

@ -36,7 +36,9 @@
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_hdcp.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"
@ -1060,10 +1062,29 @@ static uint32_t skl_get_aux_send_ctl(struct intel_dp *intel_dp,
DP_AUX_CH_CTL_SYNC_PULSE_SKL(32);
}
static uint32_t intel_dp_get_aux_send_ctl(struct intel_dp *intel_dp,
bool has_aux_irq,
int send_bytes,
uint32_t aux_clock_divider,
bool aksv_write)
{
uint32_t val = 0;
if (aksv_write) {
send_bytes += 5;
val |= DP_AUX_CH_CTL_AUX_AKSV_SELECT;
}
return val | intel_dp->get_aux_send_ctl(intel_dp,
has_aux_irq,
send_bytes,
aux_clock_divider);
}
static int
intel_dp_aux_ch(struct intel_dp *intel_dp,
const uint8_t *send, int send_bytes,
uint8_t *recv, int recv_size)
uint8_t *recv, int recv_size, bool aksv_write)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_i915_private *dev_priv =
@ -1123,10 +1144,11 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
}
while ((aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, clock++))) {
u32 send_ctl = intel_dp->get_aux_send_ctl(intel_dp,
has_aux_irq,
send_bytes,
aux_clock_divider);
u32 send_ctl = intel_dp_get_aux_send_ctl(intel_dp,
has_aux_irq,
send_bytes,
aux_clock_divider,
aksv_write);
/* Must try at least 3 times according to DP spec */
for (try = 0; try < 5; try++) {
@ -1263,7 +1285,8 @@ intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
if (msg->buffer)
memcpy(txbuf + HEADER_SIZE, msg->buffer, msg->size);
ret = intel_dp_aux_ch(intel_dp, txbuf, txsize, rxbuf, rxsize);
ret = intel_dp_aux_ch(intel_dp, txbuf, txsize, rxbuf, rxsize,
false);
if (ret > 0) {
msg->reply = rxbuf[0] >> 4;
@ -1285,7 +1308,8 @@ intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
if (WARN_ON(rxsize > 20))
return -E2BIG;
ret = intel_dp_aux_ch(intel_dp, txbuf, txsize, rxbuf, rxsize);
ret = intel_dp_aux_ch(intel_dp, txbuf, txsize, rxbuf, rxsize,
false);
if (ret > 0) {
msg->reply = rxbuf[0] >> 4;
/*
@ -5025,6 +5049,236 @@ void intel_dp_encoder_suspend(struct intel_encoder *intel_encoder)
pps_unlock(intel_dp);
}
static
int intel_dp_hdcp_write_an_aksv(struct intel_digital_port *intel_dig_port,
u8 *an)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&intel_dig_port->base.base);
uint8_t txbuf[4], rxbuf[2], reply = 0;
ssize_t dpcd_ret;
int ret;
/* Output An first, that's easy */
dpcd_ret = drm_dp_dpcd_write(&intel_dig_port->dp.aux, DP_AUX_HDCP_AN,
an, DRM_HDCP_AN_LEN);
if (dpcd_ret != DRM_HDCP_AN_LEN) {
DRM_ERROR("Failed to write An over DP/AUX (%zd)\n", dpcd_ret);
return dpcd_ret >= 0 ? -EIO : dpcd_ret;
}
/*
* Since Aksv is Oh-So-Secret, we can't access it in software. So in
* order to get it on the wire, we need to create the AUX header as if
* we were writing the data, and then tickle the hardware to output the
* data once the header is sent out.
*/
txbuf[0] = (DP_AUX_NATIVE_WRITE << 4) |
((DP_AUX_HDCP_AKSV >> 16) & 0xf);
txbuf[1] = (DP_AUX_HDCP_AKSV >> 8) & 0xff;
txbuf[2] = DP_AUX_HDCP_AKSV & 0xff;
txbuf[3] = DRM_HDCP_KSV_LEN - 1;
ret = intel_dp_aux_ch(intel_dp, txbuf, sizeof(txbuf), rxbuf,
sizeof(rxbuf), true);
if (ret < 0) {
DRM_ERROR("Write Aksv over DP/AUX failed (%d)\n", ret);
return ret;
} else if (ret == 0) {
DRM_ERROR("Aksv write over DP/AUX was empty\n");
return -EIO;
}
reply = (rxbuf[0] >> 4) & DP_AUX_NATIVE_REPLY_MASK;
return reply == DP_AUX_NATIVE_REPLY_ACK ? 0 : -EIO;
}
static int intel_dp_hdcp_read_bksv(struct intel_digital_port *intel_dig_port,
u8 *bksv)
{
ssize_t ret;
ret = drm_dp_dpcd_read(&intel_dig_port->dp.aux, DP_AUX_HDCP_BKSV, bksv,
DRM_HDCP_KSV_LEN);
if (ret != DRM_HDCP_KSV_LEN) {
DRM_ERROR("Read Bksv from DP/AUX failed (%zd)\n", ret);
return ret >= 0 ? -EIO : ret;
}
return 0;
}
static int intel_dp_hdcp_read_bstatus(struct intel_digital_port *intel_dig_port,
u8 *bstatus)
{
ssize_t ret;
/*
* For some reason the HDMI and DP HDCP specs call this register
* definition by different names. In the HDMI spec, it's called BSTATUS,
* but in DP it's called BINFO.
*/
ret = drm_dp_dpcd_read(&intel_dig_port->dp.aux, DP_AUX_HDCP_BINFO,
bstatus, DRM_HDCP_BSTATUS_LEN);
if (ret != DRM_HDCP_BSTATUS_LEN) {
DRM_ERROR("Read bstatus from DP/AUX failed (%zd)\n", ret);
return ret >= 0 ? -EIO : ret;
}
return 0;
}
static
int intel_dp_hdcp_read_bcaps(struct intel_digital_port *intel_dig_port,
u8 *bcaps)
{
ssize_t ret;
ret = drm_dp_dpcd_read(&intel_dig_port->dp.aux, DP_AUX_HDCP_BCAPS,
bcaps, 1);
if (ret != 1) {
DRM_ERROR("Read bcaps from DP/AUX failed (%zd)\n", ret);
return ret >= 0 ? -EIO : ret;
}
return 0;
}
static
int intel_dp_hdcp_repeater_present(struct intel_digital_port *intel_dig_port,
bool *repeater_present)
{
ssize_t ret;
u8 bcaps;
ret = intel_dp_hdcp_read_bcaps(intel_dig_port, &bcaps);
if (ret)
return ret;
*repeater_present = bcaps & DP_BCAPS_REPEATER_PRESENT;
return 0;
}
static
int intel_dp_hdcp_read_ri_prime(struct intel_digital_port *intel_dig_port,
u8 *ri_prime)
{
ssize_t ret;
ret = drm_dp_dpcd_read(&intel_dig_port->dp.aux, DP_AUX_HDCP_RI_PRIME,
ri_prime, DRM_HDCP_RI_LEN);
if (ret != DRM_HDCP_RI_LEN) {
DRM_ERROR("Read Ri' from DP/AUX failed (%zd)\n", ret);
return ret >= 0 ? -EIO : ret;
}
return 0;
}
static
int intel_dp_hdcp_read_ksv_ready(struct intel_digital_port *intel_dig_port,
bool *ksv_ready)
{
ssize_t ret;
u8 bstatus;
ret = drm_dp_dpcd_read(&intel_dig_port->dp.aux, DP_AUX_HDCP_BSTATUS,
&bstatus, 1);
if (ret != 1) {
DRM_ERROR("Read bstatus from DP/AUX failed (%zd)\n", ret);
return ret >= 0 ? -EIO : ret;
}
*ksv_ready = bstatus & DP_BSTATUS_READY;
return 0;
}
static
int intel_dp_hdcp_read_ksv_fifo(struct intel_digital_port *intel_dig_port,
int num_downstream, u8 *ksv_fifo)
{
ssize_t ret;
int i;
/* KSV list is read via 15 byte window (3 entries @ 5 bytes each) */
for (i = 0; i < num_downstream; i += 3) {
size_t len = min(num_downstream - i, 3) * DRM_HDCP_KSV_LEN;
ret = drm_dp_dpcd_read(&intel_dig_port->dp.aux,
DP_AUX_HDCP_KSV_FIFO,
ksv_fifo + i * DRM_HDCP_KSV_LEN,
len);
if (ret != len) {
DRM_ERROR("Read ksv[%d] from DP/AUX failed (%zd)\n", i,
ret);
return ret >= 0 ? -EIO : ret;
}
}
return 0;
}
static
int intel_dp_hdcp_read_v_prime_part(struct intel_digital_port *intel_dig_port,
int i, u32 *part)
{
ssize_t ret;
if (i >= DRM_HDCP_V_PRIME_NUM_PARTS)
return -EINVAL;
ret = drm_dp_dpcd_read(&intel_dig_port->dp.aux,
DP_AUX_HDCP_V_PRIME(i), part,
DRM_HDCP_V_PRIME_PART_LEN);
if (ret != DRM_HDCP_V_PRIME_PART_LEN) {
DRM_ERROR("Read v'[%d] from DP/AUX failed (%zd)\n", i, ret);
return ret >= 0 ? -EIO : ret;
}
return 0;
}
static
int intel_dp_hdcp_toggle_signalling(struct intel_digital_port *intel_dig_port,
bool enable)
{
/* Not used for single stream DisplayPort setups */
return 0;
}
static
bool intel_dp_hdcp_check_link(struct intel_digital_port *intel_dig_port)
{
ssize_t ret;
u8 bstatus;
ret = drm_dp_dpcd_read(&intel_dig_port->dp.aux, DP_AUX_HDCP_BSTATUS,
&bstatus, 1);
if (ret != 1) {
DRM_ERROR("Read bstatus from DP/AUX failed (%zd)\n", ret);
return false;
}
return !(bstatus & (DP_BSTATUS_LINK_FAILURE | DP_BSTATUS_REAUTH_REQ));
}
static
int intel_dp_hdcp_capable(struct intel_digital_port *intel_dig_port,
bool *hdcp_capable)
{
ssize_t ret;
u8 bcaps;
ret = intel_dp_hdcp_read_bcaps(intel_dig_port, &bcaps);
if (ret)
return ret;
*hdcp_capable = bcaps & DP_BCAPS_HDCP_CAPABLE;
return 0;
}
static const struct intel_hdcp_shim intel_dp_hdcp_shim = {
.write_an_aksv = intel_dp_hdcp_write_an_aksv,
.read_bksv = intel_dp_hdcp_read_bksv,
.read_bstatus = intel_dp_hdcp_read_bstatus,
.repeater_present = intel_dp_hdcp_repeater_present,
.read_ri_prime = intel_dp_hdcp_read_ri_prime,
.read_ksv_ready = intel_dp_hdcp_read_ksv_ready,
.read_ksv_fifo = intel_dp_hdcp_read_ksv_fifo,
.read_v_prime_part = intel_dp_hdcp_read_v_prime_part,
.toggle_signalling = intel_dp_hdcp_toggle_signalling,
.check_link = intel_dp_hdcp_check_link,
.hdcp_capable = intel_dp_hdcp_capable,
};
static void intel_edp_panel_vdd_sanitize(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = to_i915(intel_dp_to_dev(intel_dp));
@ -5190,6 +5444,9 @@ err:
drm_modeset_acquire_fini(&ctx);
WARN(iret, "Acquiring modeset locks failed with %i\n", iret);
/* Short pulse can signify loss of hdcp authentication */
intel_hdcp_check_link(intel_dp->attached_connector);
if (!handled) {
intel_dp->detect_done = false;
goto put_power;
@ -6179,6 +6436,12 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
intel_dp_add_properties(intel_dp, connector);
if (is_hdcp_supported(dev_priv, port) && !intel_dp_is_edp(intel_dp)) {
int ret = intel_hdcp_init(intel_connector, &intel_dp_hdcp_shim);
if (ret)
DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
}
/* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
* 0xd. Failure to do so will result in spurious interrupts being
* generated on the port when a cable is not attached.

109
drivers/gpu/drm/i915/intel_drv.h
View File

@ -41,20 +41,21 @@
#include <drm/drm_atomic.h>
/**
* _wait_for - magic (register) wait macro
* __wait_for - magic wait macro
*
* Does the right thing for modeset paths when run under kdgb or similar atomic
* contexts. Note that it's important that we check the condition again after
* having timed out, since the timeout could be due to preemption or similar and
* we've never had a chance to check the condition before the timeout.
* Macro to help avoid open coding check/wait/timeout patterns. Note that it's
* important that we check the condition again after having timed out, since the
* timeout could be due to preemption or similar and we've never had a chance to
* check the condition before the timeout.
*/
#define _wait_for(COND, US, Wmin, Wmax) ({ \
#define __wait_for(OP, COND, US, Wmin, Wmax) ({ \
unsigned long timeout__ = jiffies + usecs_to_jiffies(US) + 1; \
long wait__ = (Wmin); /* recommended min for usleep is 10 us */ \
int ret__; \
might_sleep(); \
for (;;) { \
bool expired__ = time_after(jiffies, timeout__); \
OP; \
if (COND) { \
ret__ = 0; \
break; \
@ -70,7 +71,9 @@
ret__; \
})
#define wait_for(COND, MS) _wait_for((COND), (MS) * 1000, 10, 1000)
#define _wait_for(COND, US, Wmin, Wmax) __wait_for(, (COND), (US), (Wmin), \
(Wmax))
#define wait_for(COND, MS) _wait_for((COND), (MS) * 1000, 10, 1000)
/* If CONFIG_PREEMPT_COUNT is disabled, in_atomic() always reports false. */
#if defined(CONFIG_DRM_I915_DEBUG) && defined(CONFIG_PREEMPT_COUNT)
@ -298,6 +301,80 @@ struct intel_panel {
} backlight;
};
/*
* This structure serves as a translation layer between the generic HDCP code
* and the bus-specific code. What that means is that HDCP over HDMI differs
* from HDCP over DP, so to account for these differences, we need to
* communicate with the receiver through this shim.
*
* For completeness, the 2 buses differ in the following ways:
* - DP AUX vs. DDC
* HDCP registers on the receiver are set via DP AUX for DP, and
* they are set via DDC for HDMI.
* - Receiver register offsets
* The offsets of the registers are different for DP vs. HDMI
* - Receiver register masks/offsets
* For instance, the ready bit for the KSV fifo is in a different
* place on DP vs HDMI
* - Receiver register names
* Seriously. In the DP spec, the 16-bit register containing
* downstream information is called BINFO, on HDMI it's called
* BSTATUS. To confuse matters further, DP has a BSTATUS register
* with a completely different definition.
* - KSV FIFO
* On HDMI, the ksv fifo is read all at once, whereas on DP it must
* be read 3 keys at a time
* - Aksv output
* Since Aksv is hidden in hardware, there's different procedures
* to send it over DP AUX vs DDC
*/
struct intel_hdcp_shim {
/* Outputs the transmitter's An and Aksv values to the receiver. */
int (*write_an_aksv)(struct intel_digital_port *intel_dig_port, u8 *an);
/* Reads the receiver's key selection vector */
int (*read_bksv)(struct intel_digital_port *intel_dig_port, u8 *bksv);
/*
* Reads BINFO from DP receivers and BSTATUS from HDMI receivers. The
* definitions are the same in the respective specs, but the names are
* different. Call it BSTATUS since that's the name the HDMI spec
* uses and it was there first.
*/
int (*read_bstatus)(struct intel_digital_port *intel_dig_port,
u8 *bstatus);
/* Determines whether a repeater is present downstream */
int (*repeater_present)(struct intel_digital_port *intel_dig_port,
bool *repeater_present);
/* Reads the receiver's Ri' value */
int (*read_ri_prime)(struct intel_digital_port *intel_dig_port, u8 *ri);
/* Determines if the receiver's KSV FIFO is ready for consumption */
int (*read_ksv_ready)(struct intel_digital_port *intel_dig_port,
bool *ksv_ready);
/* Reads the ksv fifo for num_downstream devices */
int (*read_ksv_fifo)(struct intel_digital_port *intel_dig_port,
int num_downstream, u8 *ksv_fifo);
/* Reads a 32-bit part of V' from the receiver */
int (*read_v_prime_part)(struct intel_digital_port *intel_dig_port,
int i, u32 *part);
/* Enables HDCP signalling on the port */
int (*toggle_signalling)(struct intel_digital_port *intel_dig_port,
bool enable);
/* Ensures the link is still protected */
bool (*check_link)(struct intel_digital_port *intel_dig_port);
/* Detects panel's hdcp capability. This is optional for HDMI. */
int (*hdcp_capable)(struct intel_digital_port *intel_dig_port,
bool *hdcp_capable);
};
struct intel_connector {
struct drm_connector base;
/*
@ -329,6 +406,12 @@ struct intel_connector {
/* Work struct to schedule a uevent on link train failure */
struct work_struct modeset_retry_work;
const struct intel_hdcp_shim *hdcp_shim;
struct mutex hdcp_mutex;
uint64_t hdcp_value; /* protected by hdcp_mutex */
struct delayed_work hdcp_check_work;
struct work_struct hdcp_prop_work;
};
struct intel_digital_connector_state {
@ -1297,6 +1380,8 @@ void intel_ddi_compute_min_voltage_level(struct drm_i915_private *dev_priv,
u32 bxt_signal_levels(struct intel_dp *intel_dp);
uint32_t ddi_signal_levels(struct intel_dp *intel_dp);
u8 intel_ddi_dp_voltage_max(struct intel_encoder *encoder);
int intel_ddi_toggle_hdcp_signalling(struct intel_encoder *intel_encoder,
bool enable);
unsigned int intel_fb_align_height(const struct drm_framebuffer *fb,
int plane, unsigned int height);
@ -1757,6 +1842,16 @@ static inline void intel_backlight_device_unregister(struct intel_connector *con
}
#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
/* intel_hdcp.c */
void intel_hdcp_atomic_check(struct drm_connector *connector,
struct drm_connector_state *old_state,
struct drm_connector_state *new_state);
int intel_hdcp_init(struct intel_connector *connector,
const struct intel_hdcp_shim *hdcp_shim);
int intel_hdcp_enable(struct intel_connector *connector);
int intel_hdcp_disable(struct intel_connector *connector);
int intel_hdcp_check_link(struct intel_connector *connector);
bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port);
/* intel_psr.c */
#define CAN_PSR(dev_priv) (HAS_PSR(dev_priv) && dev_priv->psr.sink_support)

807
drivers/gpu/drm/i915/intel_hdcp.c Normal file
View File

@ -0,0 +1,807 @@
/* SPDX-License-Identifier: MIT */
/*
* Copyright (C) 2017 Google, Inc.
*
* Authors:
* Sean Paul <seanpaul@chromium.org>
*/
#include <drm/drmP.h>
#include <drm/drm_hdcp.h>
#include <linux/i2c.h>
#include <linux/random.h>
#include "intel_drv.h"
#include "i915_reg.h"
#define KEY_LOAD_TRIES 5
static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port,
const struct intel_hdcp_shim *shim)
{
int ret, read_ret;
bool ksv_ready;
/* Poll for ksv list ready (spec says max time allowed is 5s) */
ret = __wait_for(read_ret = shim->read_ksv_ready(intel_dig_port,
&ksv_ready),
read_ret || ksv_ready, 5 * 1000 * 1000, 1000,
100 * 1000);
if (ret)
return ret;
if (read_ret)
return read_ret;
if (!ksv_ready)
return -ETIMEDOUT;
return 0;
}
static void intel_hdcp_clear_keys(struct drm_i915_private *dev_priv)
{
I915_WRITE(HDCP_KEY_CONF, HDCP_CLEAR_KEYS_TRIGGER);
I915_WRITE(HDCP_KEY_STATUS, HDCP_KEY_LOAD_DONE | HDCP_KEY_LOAD_STATUS |
HDCP_FUSE_IN_PROGRESS | HDCP_FUSE_ERROR | HDCP_FUSE_DONE);
}
static int intel_hdcp_load_keys(struct drm_i915_private *dev_priv)
{
int ret;
u32 val;
val = I915_READ(HDCP_KEY_STATUS);
if ((val & HDCP_KEY_LOAD_DONE) && (val & HDCP_KEY_LOAD_STATUS))
return 0;
/*
* On HSW and BDW HW loads the HDCP1.4 Key when Display comes
* out of reset. So if Key is not already loaded, its an error state.
*/
if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
if (!(I915_READ(HDCP_KEY_STATUS) & HDCP_KEY_LOAD_DONE))
return -ENXIO;
/*
* Initiate loading the HDCP key from fuses.
*
* BXT+ platforms, HDCP key needs to be loaded by SW. Only SKL and KBL
* differ in the key load trigger process from other platforms.
*/
if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) {
mutex_lock(&dev_priv->pcu_lock);
ret = sandybridge_pcode_write(dev_priv,
SKL_PCODE_LOAD_HDCP_KEYS, 1);
mutex_unlock(&dev_priv->pcu_lock);
if (ret) {
DRM_ERROR("Failed to initiate HDCP key load (%d)\n",
ret);
return ret;
}
} else {
I915_WRITE(HDCP_KEY_CONF, HDCP_KEY_LOAD_TRIGGER);
}
/* Wait for the keys to load (500us) */
ret = __intel_wait_for_register(dev_priv, HDCP_KEY_STATUS,
HDCP_KEY_LOAD_DONE, HDCP_KEY_LOAD_DONE,
10, 1, &val);
if (ret)
return ret;
else if (!(val & HDCP_KEY_LOAD_STATUS))
return -ENXIO;
/* Send Aksv over to PCH display for use in authentication */
I915_WRITE(HDCP_KEY_CONF, HDCP_AKSV_SEND_TRIGGER);
return 0;
}
/* Returns updated SHA-1 index */
static int intel_write_sha_text(struct drm_i915_private *dev_priv, u32 sha_text)
{
I915_WRITE(HDCP_SHA_TEXT, sha_text);
if (intel_wait_for_register(dev_priv, HDCP_REP_CTL,
HDCP_SHA1_READY, HDCP_SHA1_READY, 1)) {
DRM_ERROR("Timed out waiting for SHA1 ready\n");
return -ETIMEDOUT;
}
return 0;
}
static
u32 intel_hdcp_get_repeater_ctl(struct intel_digital_port *intel_dig_port)
{
enum port port = intel_dig_port->base.port;
switch (port) {
case PORT_A:
return HDCP_DDIA_REP_PRESENT | HDCP_DDIA_SHA1_M0;
case PORT_B:
return HDCP_DDIB_REP_PRESENT | HDCP_DDIB_SHA1_M0;
case PORT_C:
return HDCP_DDIC_REP_PRESENT | HDCP_DDIC_SHA1_M0;
case PORT_D:
return HDCP_DDID_REP_PRESENT | HDCP_DDID_SHA1_M0;
case PORT_E:
return HDCP_DDIE_REP_PRESENT | HDCP_DDIE_SHA1_M0;
default:
break;
}
DRM_ERROR("Unknown port %d\n", port);
return -EINVAL;
}
static
bool intel_hdcp_is_ksv_valid(u8 *ksv)
{
int i, ones = 0;
/* KSV has 20 1's and 20 0's */
for (i = 0; i < DRM_HDCP_KSV_LEN; i++)
ones += hweight8(ksv[i]);
if (ones != 20)
return false;
return true;
}
/* Implements Part 2 of the HDCP authorization procedure */
static
int intel_hdcp_auth_downstream(struct intel_digital_port *intel_dig_port,
const struct intel_hdcp_shim *shim)
{
struct drm_i915_private *dev_priv;
u32 vprime, sha_text, sha_leftovers, rep_ctl;
u8 bstatus[2], num_downstream, *ksv_fifo;
int ret, i, j, sha_idx;
dev_priv = intel_dig_port->base.base.dev->dev_private;
ret = intel_hdcp_poll_ksv_fifo(intel_dig_port, shim);
if (ret) {
DRM_ERROR("KSV list failed to become ready (%d)\n", ret);
return ret;
}
ret = shim->read_bstatus(intel_dig_port, bstatus);
if (ret)
return ret;
if (DRM_HDCP_MAX_DEVICE_EXCEEDED(bstatus[0]) ||
DRM_HDCP_MAX_CASCADE_EXCEEDED(bstatus[1])) {
DRM_ERROR("Max Topology Limit Exceeded\n");
return -EPERM;
}
/*
* When repeater reports 0 device count, HDCP1.4 spec allows disabling
* the HDCP encryption. That implies that repeater can't have its own
* display. As there is no consumption of encrypted content in the
* repeater with 0 downstream devices, we are failing the
* authentication.
*/
num_downstream = DRM_HDCP_NUM_DOWNSTREAM(bstatus[0]);
if (num_downstream == 0)
return -EINVAL;
ksv_fifo = kzalloc(num_downstream * DRM_HDCP_KSV_LEN, GFP_KERNEL);
if (!ksv_fifo)
return -ENOMEM;
ret = shim->read_ksv_fifo(intel_dig_port, num_downstream, ksv_fifo);
if (ret)
return ret;
/* Process V' values from the receiver */
for (i = 0; i < DRM_HDCP_V_PRIME_NUM_PARTS; i++) {
ret = shim->read_v_prime_part(intel_dig_port, i, &vprime);
if (ret)
return ret;
I915_WRITE(HDCP_SHA_V_PRIME(i), vprime);
}
/*
* We need to write the concatenation of all device KSVs, BINFO (DP) ||
* BSTATUS (HDMI), and M0 (which is added via HDCP_REP_CTL). This byte
* stream is written via the HDCP_SHA_TEXT register in 32-bit
* increments. Every 64 bytes, we need to write HDCP_REP_CTL again. This
* index will keep track of our progress through the 64 bytes as well as
* helping us work the 40-bit KSVs through our 32-bit register.
*
* NOTE: data passed via HDCP_SHA_TEXT should be big-endian
*/
sha_idx = 0;
sha_text = 0;
sha_leftovers = 0;
rep_ctl = intel_hdcp_get_repeater_ctl(intel_dig_port);
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_32);
for (i = 0; i < num_downstream; i++) {
unsigned int sha_empty;
u8 *ksv = &ksv_fifo[i * DRM_HDCP_KSV_LEN];
/* Fill up the empty slots in sha_text and write it out */
sha_empty = sizeof(sha_text) - sha_leftovers;
for (j = 0; j < sha_empty; j++)
sha_text |= ksv[j] << ((sizeof(sha_text) - j - 1) * 8);
ret = intel_write_sha_text(dev_priv, sha_text);
if (ret < 0)
return ret;
/* Programming guide writes this every 64 bytes */
sha_idx += sizeof(sha_text);
if (!(sha_idx % 64))
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_32);
/* Store the leftover bytes from the ksv in sha_text */
sha_leftovers = DRM_HDCP_KSV_LEN - sha_empty;
sha_text = 0;
for (j = 0; j < sha_leftovers; j++)
sha_text |= ksv[sha_empty + j] <<
((sizeof(sha_text) - j - 1) * 8);
/*
* If we still have room in sha_text for more data, continue.
* Otherwise, write it out immediately.
*/
if (sizeof(sha_text) > sha_leftovers)
continue;
ret = intel_write_sha_text(dev_priv, sha_text);
if (ret < 0)
return ret;
sha_leftovers = 0;
sha_text = 0;
sha_idx += sizeof(sha_text);
}
/*
* We need to write BINFO/BSTATUS, and M0 now. Depending on how many
* bytes are leftover from the last ksv, we might be able to fit them
* all in sha_text (first 2 cases), or we might need to split them up
* into 2 writes (last 2 cases).
*/
if (sha_leftovers == 0) {
/* Write 16 bits of text, 16 bits of M0 */
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_16);
ret = intel_write_sha_text(dev_priv,
bstatus[0] << 8 | bstatus[1]);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
/* Write 32 bits of M0 */
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_0);
ret = intel_write_sha_text(dev_priv, 0);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
/* Write 16 bits of M0 */
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_16);
ret = intel_write_sha_text(dev_priv, 0);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
} else if (sha_leftovers == 1) {
/* Write 24 bits of text, 8 bits of M0 */
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_24);
sha_text |= bstatus[0] << 16 | bstatus[1] << 8;
/* Only 24-bits of data, must be in the LSB */
sha_text = (sha_text & 0xffffff00) >> 8;
ret = intel_write_sha_text(dev_priv, sha_text);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
/* Write 32 bits of M0 */
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_0);
ret = intel_write_sha_text(dev_priv, 0);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
/* Write 24 bits of M0 */
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_8);
ret = intel_write_sha_text(dev_priv, 0);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
} else if (sha_leftovers == 2) {
/* Write 32 bits of text */
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_32);
sha_text |= bstatus[0] << 24 | bstatus[1] << 16;
ret = intel_write_sha_text(dev_priv, sha_text);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
/* Write 64 bits of M0 */
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_0);
for (i = 0; i < 2; i++) {
ret = intel_write_sha_text(dev_priv, 0);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
}
} else if (sha_leftovers == 3) {
/* Write 32 bits of text */
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_32);
sha_text |= bstatus[0] << 24;
ret = intel_write_sha_text(dev_priv, sha_text);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
/* Write 8 bits of text, 24 bits of M0 */
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_8);
ret = intel_write_sha_text(dev_priv, bstatus[1]);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
/* Write 32 bits of M0 */
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_0);
ret = intel_write_sha_text(dev_priv, 0);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
/* Write 8 bits of M0 */
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_24);
ret = intel_write_sha_text(dev_priv, 0);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
} else {
DRM_ERROR("Invalid number of leftovers %d\n", sha_leftovers);
return -EINVAL;
}
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_32);
/* Fill up to 64-4 bytes with zeros (leave the last write for length) */
while ((sha_idx % 64) < (64 - sizeof(sha_text))) {
ret = intel_write_sha_text(dev_priv, 0);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
}
/*
* Last write gets the length of the concatenation in bits. That is:
* - 5 bytes per device
* - 10 bytes for BINFO/BSTATUS(2), M0(8)
*/
sha_text = (num_downstream * 5 + 10) * 8;
ret = intel_write_sha_text(dev_priv, sha_text);
if (ret < 0)
return ret;
/* Tell the HW we're done with the hash and wait for it to ACK */
I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_COMPLETE_HASH);
if (intel_wait_for_register(dev_priv, HDCP_REP_CTL,
HDCP_SHA1_COMPLETE,
HDCP_SHA1_COMPLETE, 1)) {
DRM_ERROR("Timed out waiting for SHA1 complete\n");
return -ETIMEDOUT;
}
if (!(I915_READ(HDCP_REP_CTL) & HDCP_SHA1_V_MATCH)) {
DRM_ERROR("SHA-1 mismatch, HDCP failed\n");
return -ENXIO;
}
DRM_DEBUG_KMS("HDCP is enabled (%d downstream devices)\n",
num_downstream);
return 0;
}
/* Implements Part 1 of the HDCP authorization procedure */
static int intel_hdcp_auth(struct intel_digital_port *intel_dig_port,
const struct intel_hdcp_shim *shim)
{
struct drm_i915_private *dev_priv;
enum port port;
unsigned long r0_prime_gen_start;
int ret, i, tries = 2;
union {
u32 reg[2];
u8 shim[DRM_HDCP_AN_LEN];
} an;
union {
u32 reg[2];
u8 shim[DRM_HDCP_KSV_LEN];
} bksv;
union {
u32 reg;
u8 shim[DRM_HDCP_RI_LEN];
} ri;
bool repeater_present, hdcp_capable;
dev_priv = intel_dig_port->base.base.dev->dev_private;
port = intel_dig_port->base.port;
/*
* Detects whether the display is HDCP capable. Although we check for
* valid Bksv below, the HDCP over DP spec requires that we check
* whether the display supports HDCP before we write An. For HDMI
* displays, this is not necessary.
*/
if (shim->hdcp_capable) {
ret = shim->hdcp_capable(intel_dig_port, &hdcp_capable);
if (ret)
return ret;
if (!hdcp_capable) {
DRM_ERROR("Panel is not HDCP capable\n");
return -EINVAL;
}
}
/* Initialize An with 2 random values and acquire it */
for (i = 0; i < 2; i++)
I915_WRITE(PORT_HDCP_ANINIT(port), get_random_u32());
I915_WRITE(PORT_HDCP_CONF(port), HDCP_CONF_CAPTURE_AN);
/* Wait for An to be acquired */
if (intel_wait_for_register(dev_priv, PORT_HDCP_STATUS(port),
HDCP_STATUS_AN_READY,
HDCP_STATUS_AN_READY, 1)) {
DRM_ERROR("Timed out waiting for An\n");
return -ETIMEDOUT;
}
an.reg[0] = I915_READ(PORT_HDCP_ANLO(port));
an.reg[1] = I915_READ(PORT_HDCP_ANHI(port));
ret = shim->write_an_aksv(intel_dig_port, an.shim);
if (ret)
return ret;
r0_prime_gen_start = jiffies;
memset(&bksv, 0, sizeof(bksv));
/* HDCP spec states that we must retry the bksv if it is invalid */
for (i = 0; i < tries; i++) {
ret = shim->read_bksv(intel_dig_port, bksv.shim);
if (ret)
return ret;
if (intel_hdcp_is_ksv_valid(bksv.shim))
break;
}
if (i == tries) {
DRM_ERROR("HDCP failed, Bksv is invalid\n");
return -ENODEV;
}
I915_WRITE(PORT_HDCP_BKSVLO(port), bksv.reg[0]);
I915_WRITE(PORT_HDCP_BKSVHI(port), bksv.reg[1]);
ret = shim->repeater_present(intel_dig_port, &repeater_present);
if (ret)
return ret;
if (repeater_present)
I915_WRITE(HDCP_REP_CTL,
intel_hdcp_get_repeater_ctl(intel_dig_port));
ret = shim->toggle_signalling(intel_dig_port, true);
if (ret)
return ret;
I915_WRITE(PORT_HDCP_CONF(port), HDCP_CONF_AUTH_AND_ENC);
/* Wait for R0 ready */
if (wait_for(I915_READ(PORT_HDCP_STATUS(port)) &
(HDCP_STATUS_R0_READY | HDCP_STATUS_ENC), 1)) {
DRM_ERROR("Timed out waiting for R0 ready\n");
return -ETIMEDOUT;
}
/*
* Wait for R0' to become available. The spec says 100ms from Aksv, but
* some monitors can take longer than this. We'll set the timeout at
* 300ms just to be sure.
*
* On DP, there's an R0_READY bit available but no such bit
* exists on HDMI. Since the upper-bound is the same, we'll just do
* the stupid thing instead of polling on one and not the other.
*/
wait_remaining_ms_from_jiffies(r0_prime_gen_start, 300);
ri.reg = 0;
ret = shim->read_ri_prime(intel_dig_port, ri.shim);
if (ret)
return ret;
I915_WRITE(PORT_HDCP_RPRIME(port), ri.reg);
/* Wait for Ri prime match */
if (wait_for(I915_READ(PORT_HDCP_STATUS(port)) &
(HDCP_STATUS_RI_MATCH | HDCP_STATUS_ENC), 1)) {
DRM_ERROR("Timed out waiting for Ri prime match (%x)\n",
I915_READ(PORT_HDCP_STATUS(port)));
return -ETIMEDOUT;
}
/* Wait for encryption confirmation */
if (intel_wait_for_register(dev_priv, PORT_HDCP_STATUS(port),
HDCP_STATUS_ENC, HDCP_STATUS_ENC, 20)) {
DRM_ERROR("Timed out waiting for encryption\n");
return -ETIMEDOUT;
}
/*
* XXX: If we have MST-connected devices, we need to enable encryption
* on those as well.
*/
if (repeater_present)
return intel_hdcp_auth_downstream(intel_dig_port, shim);
DRM_DEBUG_KMS("HDCP is enabled (no repeater present)\n");
return 0;
}
static
struct intel_digital_port *conn_to_dig_port(struct intel_connector *connector)
{
return enc_to_dig_port(&intel_attached_encoder(&connector->base)->base);
}
static int _intel_hdcp_disable(struct intel_connector *connector)
{
struct drm_i915_private *dev_priv = connector->base.dev->dev_private;
struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
enum port port = intel_dig_port->base.port;
int ret;
DRM_DEBUG_KMS("[%s:%d] HDCP is being disabled...\n",
connector->base.name, connector->base.base.id);
I915_WRITE(PORT_HDCP_CONF(port), 0);
if (intel_wait_for_register(dev_priv, PORT_HDCP_STATUS(port), ~0, 0,
20)) {
DRM_ERROR("Failed to disable HDCP, timeout clearing status\n");
return -ETIMEDOUT;
}
ret = connector->hdcp_shim->toggle_signalling(intel_dig_port, false);
if (ret) {
DRM_ERROR("Failed to disable HDCP signalling\n");
return ret;
}
DRM_DEBUG_KMS("HDCP is disabled\n");
return 0;
}
static int _intel_hdcp_enable(struct intel_connector *connector)
{
struct drm_i915_private *dev_priv = connector->base.dev->dev_private;
int i, ret, tries = 3;
DRM_DEBUG_KMS("[%s:%d] HDCP is being enabled...\n",
connector->base.name, connector->base.base.id);
if (!(I915_READ(SKL_FUSE_STATUS) & SKL_FUSE_PG_DIST_STATUS(1))) {
DRM_ERROR("PG1 is disabled, cannot load keys\n");
return -ENXIO;
}
for (i = 0; i < KEY_LOAD_TRIES; i++) {
ret = intel_hdcp_load_keys(dev_priv);
if (!ret)
break;
intel_hdcp_clear_keys(dev_priv);
}
if (ret) {
DRM_ERROR("Could not load HDCP keys, (%d)\n", ret);
return ret;
}
/* Incase of authentication failures, HDCP spec expects reauth. */
for (i = 0; i < tries; i++) {
ret = intel_hdcp_auth(conn_to_dig_port(connector),
connector->hdcp_shim);
if (!ret)
return 0;
DRM_DEBUG_KMS("HDCP Auth failure (%d)\n", ret);
/* Ensuring HDCP encryption and signalling are stopped. */
_intel_hdcp_disable(connector);
}
DRM_ERROR("HDCP authentication failed (%d tries/%d)\n", tries, ret);
return ret;
}
static void intel_hdcp_check_work(struct work_struct *work)
{
struct intel_connector *connector = container_of(to_delayed_work(work),
struct intel_connector,
hdcp_check_work);
if (!intel_hdcp_check_link(connector))
schedule_delayed_work(&connector->hdcp_check_work,
DRM_HDCP_CHECK_PERIOD_MS);
}
static void intel_hdcp_prop_work(struct work_struct *work)
{
struct intel_connector *connector = container_of(work,
struct intel_connector,
hdcp_prop_work);
struct drm_device *dev = connector->base.dev;
struct drm_connector_state *state;
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
mutex_lock(&connector->hdcp_mutex);
/*
* This worker is only used to flip between ENABLED/DESIRED. Either of
* those to UNDESIRED is handled by core. If hdcp_value == UNDESIRED,
* we're running just after hdcp has been disabled, so just exit
*/
if (connector->hdcp_value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
state = connector->base.state;
state->content_protection = connector->hdcp_value;
}
mutex_unlock(&connector->hdcp_mutex);
drm_modeset_unlock(&dev->mode_config.connection_mutex);
}
bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port)
{
/* PORT E doesn't have HDCP, and PORT F is disabled */
return ((INTEL_GEN(dev_priv) >= 8 || IS_HASWELL(dev_priv)) &&
!IS_CHERRYVIEW(dev_priv) && port < PORT_E);
}
int intel_hdcp_init(struct intel_connector *connector,
const struct intel_hdcp_shim *hdcp_shim)
{
int ret;
ret = drm_connector_attach_content_protection_property(
&connector->base);
if (ret)
return ret;
connector->hdcp_shim = hdcp_shim;
mutex_init(&connector->hdcp_mutex);
INIT_DELAYED_WORK(&connector->hdcp_check_work, intel_hdcp_check_work);
INIT_WORK(&connector->hdcp_prop_work, intel_hdcp_prop_work);
return 0;
}
int intel_hdcp_enable(struct intel_connector *connector)
{
int ret;
if (!connector->hdcp_shim)
return -ENOENT;
mutex_lock(&connector->hdcp_mutex);
ret = _intel_hdcp_enable(connector);
if (ret)
goto out;
connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_ENABLED;
schedule_work(&connector->hdcp_prop_work);
schedule_delayed_work(&connector->hdcp_check_work,
DRM_HDCP_CHECK_PERIOD_MS);
out:
mutex_unlock(&connector->hdcp_mutex);
return ret;
}
int intel_hdcp_disable(struct intel_connector *connector)
{
int ret = 0;
if (!connector->hdcp_shim)
return -ENOENT;
mutex_lock(&connector->hdcp_mutex);
if (connector->hdcp_value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
ret = _intel_hdcp_disable(connector);
}
mutex_unlock(&connector->hdcp_mutex);
cancel_delayed_work_sync(&connector->hdcp_check_work);
return ret;
}
void intel_hdcp_atomic_check(struct drm_connector *connector,
struct drm_connector_state *old_state,
struct drm_connector_state *new_state)
{
uint64_t old_cp = old_state->content_protection;
uint64_t new_cp = new_state->content_protection;
struct drm_crtc_state *crtc_state;
if (!new_state->crtc) {
/*
* If the connector is being disabled with CP enabled, mark it
* desired so it's re-enabled when the connector is brought back
*/
if (old_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)
new_state->content_protection =
DRM_MODE_CONTENT_PROTECTION_DESIRED;
return;
}
/*
* Nothing to do if the state didn't change, or HDCP was activated since
* the last commit
*/
if (old_cp == new_cp ||
(old_cp == DRM_MODE_CONTENT_PROTECTION_DESIRED &&
new_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED))
return;
crtc_state = drm_atomic_get_new_crtc_state(new_state->state,
new_state->crtc);
crtc_state->mode_changed = true;
}
/* Implements Part 3 of the HDCP authorization procedure */
int intel_hdcp_check_link(struct intel_connector *connector)
{
struct drm_i915_private *dev_priv = connector->base.dev->dev_private;
struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
enum port port = intel_dig_port->base.port;
int ret = 0;
if (!connector->hdcp_shim)
return -ENOENT;
mutex_lock(&connector->hdcp_mutex);
if (connector->hdcp_value == DRM_MODE_CONTENT_PROTECTION_UNDESIRED)
goto out;
if (!(I915_READ(PORT_HDCP_STATUS(port)) & HDCP_STATUS_ENC)) {
DRM_ERROR("%s:%d HDCP check failed: link is not encrypted,%x\n",
connector->base.name, connector->base.base.id,
I915_READ(PORT_HDCP_STATUS(port)));
ret = -ENXIO;
connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
schedule_work(&connector->hdcp_prop_work);
goto out;
}
if (connector->hdcp_shim->check_link(intel_dig_port)) {
if (connector->hdcp_value !=
DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
connector->hdcp_value =
DRM_MODE_CONTENT_PROTECTION_ENABLED;
schedule_work(&connector->hdcp_prop_work);
}
goto out;
}
DRM_DEBUG_KMS("[%s:%d] HDCP link failed, retrying authentication\n",
connector->base.name, connector->base.base.id);
ret = _intel_hdcp_disable(connector);
if (ret) {
DRM_ERROR("Failed to disable hdcp (%d)\n", ret);
connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
schedule_work(&connector->hdcp_prop_work);
goto out;
}
ret = _intel_hdcp_enable(connector);
if (ret) {
DRM_ERROR("Failed to enable hdcp (%d)\n", ret);
connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
schedule_work(&connector->hdcp_prop_work);
goto out;
}
out:
mutex_unlock(&connector->hdcp_mutex);
return ret;
}

250
drivers/gpu/drm/i915/intel_hdmi.c
View File

@ -34,6 +34,7 @@
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include <drm/drm_hdcp.h>
#include <drm/drm_scdc_helper.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
@ -876,6 +877,248 @@ void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, bool enable)
adapter, enable);
}
static int intel_hdmi_hdcp_read(struct intel_digital_port *intel_dig_port,
unsigned int offset, void *buffer, size_t size)
{
struct intel_hdmi *hdmi = &intel_dig_port->hdmi;
struct drm_i915_private *dev_priv =
intel_dig_port->base.base.dev->dev_private;
struct i2c_adapter *adapter = intel_gmbus_get_adapter(dev_priv,
hdmi->ddc_bus);
int ret;
u8 start = offset & 0xff;
struct i2c_msg msgs[] = {
{
.addr = DRM_HDCP_DDC_ADDR,
.flags = 0,
.len = 1,
.buf = &start,
},
{
.addr = DRM_HDCP_DDC_ADDR,
.flags = I2C_M_RD,
.len = size,
.buf = buffer
}
};
ret = i2c_transfer(adapter, msgs, ARRAY_SIZE(msgs));
if (ret == ARRAY_SIZE(msgs))
return 0;
return ret >= 0 ? -EIO : ret;
}
static int intel_hdmi_hdcp_write(struct intel_digital_port *intel_dig_port,
unsigned int offset, void *buffer, size_t size)
{
struct intel_hdmi *hdmi = &intel_dig_port->hdmi;
struct drm_i915_private *dev_priv =
intel_dig_port->base.base.dev->dev_private;
struct i2c_adapter *adapter = intel_gmbus_get_adapter(dev_priv,
hdmi->ddc_bus);
int ret;
u8 *write_buf;
struct i2c_msg msg;
write_buf = kzalloc(size + 1, GFP_KERNEL);
if (!write_buf)
return -ENOMEM;
write_buf[0] = offset & 0xff;
memcpy(&write_buf[1], buffer, size);
msg.addr = DRM_HDCP_DDC_ADDR;
msg.flags = 0,
msg.len = size + 1,
msg.buf = write_buf;
ret = i2c_transfer(adapter, &msg, 1);
if (ret == 1)
return 0;
return ret >= 0 ? -EIO : ret;
}
static
int intel_hdmi_hdcp_write_an_aksv(struct intel_digital_port *intel_dig_port,
u8 *an)
{
struct intel_hdmi *hdmi = &intel_dig_port->hdmi;
struct drm_i915_private *dev_priv =
intel_dig_port->base.base.dev->dev_private;
struct i2c_adapter *adapter = intel_gmbus_get_adapter(dev_priv,
hdmi->ddc_bus);
int ret;
ret = intel_hdmi_hdcp_write(intel_dig_port, DRM_HDCP_DDC_AN, an,
DRM_HDCP_AN_LEN);
if (ret) {
DRM_ERROR("Write An over DDC failed (%d)\n", ret);
return ret;
}
ret = intel_gmbus_output_aksv(adapter);
if (ret < 0) {
DRM_ERROR("Failed to output aksv (%d)\n", ret);
return ret;
}
return 0;
}
static int intel_hdmi_hdcp_read_bksv(struct intel_digital_port *intel_dig_port,
u8 *bksv)
{
int ret;
ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_BKSV, bksv,
DRM_HDCP_KSV_LEN);
if (ret)
DRM_ERROR("Read Bksv over DDC failed (%d)\n", ret);
return ret;
}
static
int intel_hdmi_hdcp_read_bstatus(struct intel_digital_port *intel_dig_port,
u8 *bstatus)
{
int ret;
ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_BSTATUS,
bstatus, DRM_HDCP_BSTATUS_LEN);
if (ret)
DRM_ERROR("Read bstatus over DDC failed (%d)\n", ret);
return ret;
}
static
int intel_hdmi_hdcp_repeater_present(struct intel_digital_port *intel_dig_port,
bool *repeater_present)
{
int ret;
u8 val;
ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_BCAPS, &val, 1);
if (ret) {
DRM_ERROR("Read bcaps over DDC failed (%d)\n", ret);
return ret;
}
*repeater_present = val & DRM_HDCP_DDC_BCAPS_REPEATER_PRESENT;
return 0;
}
static
int intel_hdmi_hdcp_read_ri_prime(struct intel_digital_port *intel_dig_port,
u8 *ri_prime)
{
int ret;
ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_RI_PRIME,
ri_prime, DRM_HDCP_RI_LEN);
if (ret)
DRM_ERROR("Read Ri' over DDC failed (%d)\n", ret);
return ret;
}
static
int intel_hdmi_hdcp_read_ksv_ready(struct intel_digital_port *intel_dig_port,
bool *ksv_ready)
{
int ret;
u8 val;
ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_BCAPS, &val, 1);
if (ret) {
DRM_ERROR("Read bcaps over DDC failed (%d)\n", ret);
return ret;
}
*ksv_ready = val & DRM_HDCP_DDC_BCAPS_KSV_FIFO_READY;
return 0;
}
static
int intel_hdmi_hdcp_read_ksv_fifo(struct intel_digital_port *intel_dig_port,
int num_downstream, u8 *ksv_fifo)
{
int ret;
ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_KSV_FIFO,
ksv_fifo, num_downstream * DRM_HDCP_KSV_LEN);
if (ret) {
DRM_ERROR("Read ksv fifo over DDC failed (%d)\n", ret);
return ret;
}
return 0;
}
static
int intel_hdmi_hdcp_read_v_prime_part(struct intel_digital_port *intel_dig_port,
int i, u32 *part)
{
int ret;
if (i >= DRM_HDCP_V_PRIME_NUM_PARTS)
return -EINVAL;
ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_V_PRIME(i),
part, DRM_HDCP_V_PRIME_PART_LEN);
if (ret)
DRM_ERROR("Read V'[%d] over DDC failed (%d)\n", i, ret);
return ret;
}
static
int intel_hdmi_hdcp_toggle_signalling(struct intel_digital_port *intel_dig_port,
bool enable)
{
int ret;
if (!enable)
usleep_range(6, 60); /* Bspec says >= 6us */
ret = intel_ddi_toggle_hdcp_signalling(&intel_dig_port->base, enable);
if (ret) {
DRM_ERROR("%s HDCP signalling failed (%d)\n",
enable ? "Enable" : "Disable", ret);
return ret;
}
return 0;
}
static
bool intel_hdmi_hdcp_check_link(struct intel_digital_port *intel_dig_port)
{
struct drm_i915_private *dev_priv =
intel_dig_port->base.base.dev->dev_private;
enum port port = intel_dig_port->base.port;
int ret;
union {
u32 reg;
u8 shim[DRM_HDCP_RI_LEN];
} ri;
ret = intel_hdmi_hdcp_read_ri_prime(intel_dig_port, ri.shim);
if (ret)
return false;
I915_WRITE(PORT_HDCP_RPRIME(port), ri.reg);
/* Wait for Ri prime match */
if (wait_for(I915_READ(PORT_HDCP_STATUS(port)) &
(HDCP_STATUS_RI_MATCH | HDCP_STATUS_ENC), 1)) {
DRM_ERROR("Ri' mismatch detected, link check failed (%x)\n",
I915_READ(PORT_HDCP_STATUS(port)));
return false;
}
return true;
}
static const struct intel_hdcp_shim intel_hdmi_hdcp_shim = {
.write_an_aksv = intel_hdmi_hdcp_write_an_aksv,
.read_bksv = intel_hdmi_hdcp_read_bksv,
.read_bstatus = intel_hdmi_hdcp_read_bstatus,
.repeater_present = intel_hdmi_hdcp_repeater_present,
.read_ri_prime = intel_hdmi_hdcp_read_ri_prime,
.read_ksv_ready = intel_hdmi_hdcp_read_ksv_ready,
.read_ksv_fifo = intel_hdmi_hdcp_read_ksv_fifo,
.read_v_prime_part = intel_hdmi_hdcp_read_v_prime_part,
.toggle_signalling = intel_hdmi_hdcp_toggle_signalling,
.check_link = intel_hdmi_hdcp_check_link,
};
static void intel_hdmi_prepare(struct intel_encoder *encoder,
const struct intel_crtc_state *crtc_state)
{
@ -2097,6 +2340,13 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
intel_hdmi_add_properties(intel_hdmi, connector);
if (is_hdcp_supported(dev_priv, port)) {
int ret = intel_hdcp_init(intel_connector,
&intel_hdmi_hdcp_shim);
if (ret)
DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
}
intel_connector_attach_encoder(intel_connector, intel_encoder);
intel_hdmi->attached_connector = intel_connector;

81
drivers/gpu/drm/i915/intel_i2c.c
View File

@ -30,6 +30,7 @@
#include <linux/i2c-algo-bit.h>
#include <linux/export.h>
#include <drm/drmP.h>
#include <drm/drm_hdcp.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"
@ -415,7 +416,8 @@ gmbus_xfer_read(struct drm_i915_private *dev_priv, struct i2c_msg *msg,
static int
gmbus_xfer_write_chunk(struct drm_i915_private *dev_priv,
unsigned short addr, u8 *buf, unsigned int len)
unsigned short addr, u8 *buf, unsigned int len,
u32 gmbus1_index)
{
unsigned int chunk_size = len;
u32 val, loop;
@ -428,7 +430,7 @@ gmbus_xfer_write_chunk(struct drm_i915_private *dev_priv,
I915_WRITE_FW(GMBUS3, val);
I915_WRITE_FW(GMBUS1,
GMBUS_CYCLE_WAIT |
gmbus1_index | GMBUS_CYCLE_WAIT |
(chunk_size << GMBUS_BYTE_COUNT_SHIFT) |
(addr << GMBUS_SLAVE_ADDR_SHIFT) |
GMBUS_SLAVE_WRITE | GMBUS_SW_RDY);
@ -451,7 +453,8 @@ gmbus_xfer_write_chunk(struct drm_i915_private *dev_priv,
}
static int
gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg)
gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg,
u32 gmbus1_index)
{
u8 *buf = msg->buf;
unsigned int tx_size = msg->len;
@ -461,7 +464,8 @@ gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg)
do {
len = min(tx_size, GMBUS_BYTE_COUNT_MAX);
ret = gmbus_xfer_write_chunk(dev_priv, msg->addr, buf, len);
ret = gmbus_xfer_write_chunk(dev_priv, msg->addr, buf, len,
gmbus1_index);
if (ret)
return ret;
@ -473,21 +477,21 @@ gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg)
}
/*
* The gmbus controller can combine a 1 or 2 byte write with a read that
* immediately follows it by using an "INDEX" cycle.
* The gmbus controller can combine a 1 or 2 byte write with another read/write
* that immediately follows it by using an "INDEX" cycle.
*/
static bool
gmbus_is_index_read(struct i2c_msg *msgs, int i, int num)
gmbus_is_index_xfer(struct i2c_msg *msgs, int i, int num)
{
return (i + 1 < num &&
msgs[i].addr == msgs[i + 1].addr &&
!(msgs[i].flags & I2C_M_RD) &&
(msgs[i].len == 1 || msgs[i].len == 2) &&
(msgs[i + 1].flags & I2C_M_RD));
msgs[i + 1].len > 0);
}
static int
gmbus_xfer_index_read(struct drm_i915_private *dev_priv, struct i2c_msg *msgs)
gmbus_index_xfer(struct drm_i915_private *dev_priv, struct i2c_msg *msgs)
{
u32 gmbus1_index = 0;
u32 gmbus5 = 0;
@ -504,7 +508,10 @@ gmbus_xfer_index_read(struct drm_i915_private *dev_priv, struct i2c_msg *msgs)
if (gmbus5)
I915_WRITE_FW(GMBUS5, gmbus5);
ret = gmbus_xfer_read(dev_priv, &msgs[1], gmbus1_index);
if (msgs[1].flags & I2C_M_RD)
ret = gmbus_xfer_read(dev_priv, &msgs[1], gmbus1_index);
else
ret = gmbus_xfer_write(dev_priv, &msgs[1], gmbus1_index);
/* Clear GMBUS5 after each index transfer */
if (gmbus5)
@ -514,7 +521,8 @@ gmbus_xfer_index_read(struct drm_i915_private *dev_priv, struct i2c_msg *msgs)
}
static int
do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num,
u32 gmbus0_source)
{
struct intel_gmbus *bus = container_of(adapter,
struct intel_gmbus,
@ -531,17 +539,17 @@ do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
pch_gmbus_clock_gating(dev_priv, false);
retry:
I915_WRITE_FW(GMBUS0, bus->reg0);
I915_WRITE_FW(GMBUS0, gmbus0_source | bus->reg0);
for (; i < num; i += inc) {
inc = 1;
if (gmbus_is_index_read(msgs, i, num)) {
ret = gmbus_xfer_index_read(dev_priv, &msgs[i]);
inc = 2; /* an index read is two msgs */
if (gmbus_is_index_xfer(msgs, i, num)) {
ret = gmbus_index_xfer(dev_priv, &msgs[i]);
inc = 2; /* an index transmission is two msgs */
} else if (msgs[i].flags & I2C_M_RD) {
ret = gmbus_xfer_read(dev_priv, &msgs[i], 0);
} else {
ret = gmbus_xfer_write(dev_priv, &msgs[i]);
ret = gmbus_xfer_write(dev_priv, &msgs[i], 0);
}
if (!ret)
@ -656,7 +664,7 @@ gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
if (ret < 0)
bus->force_bit &= ~GMBUS_FORCE_BIT_RETRY;
} else {
ret = do_gmbus_xfer(adapter, msgs, num);
ret = do_gmbus_xfer(adapter, msgs, num, 0);
if (ret == -EAGAIN)
bus->force_bit |= GMBUS_FORCE_BIT_RETRY;
}
@ -666,6 +674,45 @@ gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
return ret;
}
int intel_gmbus_output_aksv(struct i2c_adapter *adapter)
{
struct intel_gmbus *bus = container_of(adapter, struct intel_gmbus,
adapter);
struct drm_i915_private *dev_priv = bus->dev_priv;
int ret;
u8 cmd = DRM_HDCP_DDC_AKSV;
u8 buf[DRM_HDCP_KSV_LEN] = { 0 };
struct i2c_msg msgs[] = {
{
.addr = DRM_HDCP_DDC_ADDR,
.flags = 0,
.len = sizeof(cmd),
.buf = &cmd,
},
{
.addr = DRM_HDCP_DDC_ADDR,
.flags = 0,
.len = sizeof(buf),
.buf = buf,
}
};
intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);
mutex_lock(&dev_priv->gmbus_mutex);
/*
* In order to output Aksv to the receiver, use an indexed write to
* pass the i2c command, and tell GMBUS to use the HW-provided value
* instead of sourcing GMBUS3 for the data.
*/
ret = do_gmbus_xfer(adapter, msgs, ARRAY_SIZE(msgs), GMBUS_AKSV_SELECT);
mutex_unlock(&dev_priv->gmbus_mutex);
intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);
return ret;
}
static u32 gmbus_func(struct i2c_adapter *adapter)
{
return i2c_bit_algo.functionality(adapter) &

23
drivers/gpu/drm/i915/intel_uncore.c
View File

@ -1767,12 +1767,14 @@ int __intel_wait_for_register_fw(struct drm_i915_private *dev_priv,
}
/**
* intel_wait_for_register - wait until register matches expected state
* __intel_wait_for_register - wait until register matches expected state
* @dev_priv: the i915 device
* @reg: the register to read
* @mask: mask to apply to register value
* @value: expected value
* @timeout_ms: timeout in millisecond
* @fast_timeout_us: fast timeout in microsecond for atomic/tight wait
* @slow_timeout_ms: slow timeout in millisecond
* @out_value: optional placeholder to hold registry value
*
* This routine waits until the target register @reg contains the expected
* @value after applying the @mask, i.e. it waits until ::
@ -1783,14 +1785,17 @@ int __intel_wait_for_register_fw(struct drm_i915_private *dev_priv,
*
* Returns 0 if the register matches the desired condition, or -ETIMEOUT.
*/
int intel_wait_for_register(struct drm_i915_private *dev_priv,
int __intel_wait_for_register(struct drm_i915_private *dev_priv,
i915_reg_t reg,
u32 mask,
u32 value,
unsigned int timeout_ms)
unsigned int fast_timeout_us,
unsigned int slow_timeout_ms,
u32 *out_value)
{
unsigned fw =
intel_uncore_forcewake_for_reg(dev_priv, reg, FW_REG_READ);
u32 reg_value;
int ret;
might_sleep();
@ -1800,14 +1805,18 @@ int intel_wait_for_register(struct drm_i915_private *dev_priv,
ret = __intel_wait_for_register_fw(dev_priv,
reg, mask, value,
2, 0, NULL);
fast_timeout_us, 0, &reg_value);
intel_uncore_forcewake_put__locked(dev_priv, fw);
spin_unlock_irq(&dev_priv->uncore.lock);
if (ret)
ret = wait_for((I915_READ_NOTRACE(reg) & mask) == value,
timeout_ms);
ret = __wait_for(reg_value = I915_READ_NOTRACE(reg),
(reg_value & mask) == value,
slow_timeout_ms * 1000, 10, 1000);
if (out_value)
*out_value = reg_value;
return ret;
}

14
drivers/gpu/drm/i915/intel_uncore.h
View File

@ -163,11 +163,23 @@ void intel_uncore_forcewake_put__locked(struct drm_i915_private *dev_priv,
void intel_uncore_forcewake_user_get(struct drm_i915_private *dev_priv);
void intel_uncore_forcewake_user_put(struct drm_i915_private *dev_priv);
int __intel_wait_for_register(struct drm_i915_private *dev_priv,
i915_reg_t reg,
u32 mask,
u32 value,
unsigned int fast_timeout_us,
unsigned int slow_timeout_ms,
u32 *out_value);
static inline
int intel_wait_for_register(struct drm_i915_private *dev_priv,
i915_reg_t reg,
u32 mask,
u32 value,
unsigned int timeout_ms);
unsigned int timeout_ms)
{
return __intel_wait_for_register(dev_priv, reg, mask, value, 2,
timeout_ms, NULL);
}
int __intel_wait_for_register_fw(struct drm_i915_private *dev_priv,
i915_reg_t reg,
u32 mask,

16
include/drm/drm_connector.h
View File

@ -419,6 +419,12 @@ struct drm_connector_state {
* upscaling, mostly used for built-in panels.
*/
unsigned int scaling_mode;
/**
* @content_protection: Connector property to request content
* protection. This is most commonly used for HDCP.
*/
unsigned int content_protection;
};
/**
@ -766,6 +772,7 @@ struct drm_cmdline_mode {
* @tile_h_size: horizontal size of this tile.
* @tile_v_size: vertical size of this tile.
* @scaling_mode_property: Optional atomic property to control the upscaling.
* @content_protection_property: Optional property to control content protection
*
* Each connector may be connected to one or more CRTCs, or may be clonable by
* another connector if they can share a CRTC. Each connector also has a specific
@ -856,6 +863,12 @@ struct drm_connector {
struct drm_property *scaling_mode_property;
/**
* @content_protection_property: DRM ENUM property for content
* protection
*/
struct drm_property *content_protection_property;
/**
* @path_blob_ptr:
*
@ -1065,6 +1078,7 @@ const char *drm_get_dvi_i_subconnector_name(int val);
const char *drm_get_dvi_i_select_name(int val);
const char *drm_get_tv_subconnector_name(int val);
const char *drm_get_tv_select_name(int val);
const char *drm_get_content_protection_name(int val);
int drm_mode_create_dvi_i_properties(struct drm_device *dev);
int drm_mode_create_tv_properties(struct drm_device *dev,
@ -1073,6 +1087,8 @@ int drm_mode_create_tv_properties(struct drm_device *dev,
int drm_mode_create_scaling_mode_property(struct drm_device *dev);
int drm_connector_attach_scaling_mode_property(struct drm_connector *connector,
u32 scaling_mode_mask);
int drm_connector_attach_content_protection_property(
struct drm_connector *connector);
int drm_mode_create_aspect_ratio_property(struct drm_device *dev);
int drm_mode_create_suggested_offset_properties(struct drm_device *dev);

17
include/drm/drm_dp_helper.h
View File

@ -840,6 +840,23 @@
#define DP_CEC_TX_MESSAGE_BUFFER 0x3020
#define DP_CEC_MESSAGE_BUFFER_LENGTH 0x10
#define DP_AUX_HDCP_BKSV 0x68000
#define DP_AUX_HDCP_RI_PRIME 0x68005
#define DP_AUX_HDCP_AKSV 0x68007
#define DP_AUX_HDCP_AN 0x6800C
#define DP_AUX_HDCP_V_PRIME(h) (0x68014 + h * 4)
#define DP_AUX_HDCP_BCAPS 0x68028
# define DP_BCAPS_REPEATER_PRESENT BIT(1)
# define DP_BCAPS_HDCP_CAPABLE BIT(0)
#define DP_AUX_HDCP_BSTATUS 0x68029
# define DP_BSTATUS_REAUTH_REQ BIT(3)
# define DP_BSTATUS_LINK_FAILURE BIT(2)
# define DP_BSTATUS_R0_PRIME_READY BIT(1)
# define DP_BSTATUS_READY BIT(0)
#define DP_AUX_HDCP_BINFO 0x6802A
#define DP_AUX_HDCP_KSV_FIFO 0x6802C
#define DP_AUX_HDCP_AINFO 0x6803B
/* DP 1.2 Sideband message defines */
/* peer device type - DP 1.2a Table 2-92 */
#define DP_PEER_DEVICE_NONE 0x0

41
include/drm/drm_hdcp.h Normal file
View File

@ -0,0 +1,41 @@
/* SPDX-License-Identifier: MIT */
/*
* Copyright (C) 2017 Google, Inc.
*
* Authors:
* Sean Paul <seanpaul@chromium.org>
*/
#ifndef _DRM_HDCP_H_INCLUDED_
#define _DRM_HDCP_H_INCLUDED_
/* Period of hdcp checks (to ensure we're still authenticated) */
#define DRM_HDCP_CHECK_PERIOD_MS (128 * 16)
/* Shared lengths/masks between HDMI/DVI/DisplayPort */
#define DRM_HDCP_AN_LEN 8
#define DRM_HDCP_BSTATUS_LEN 2
#define DRM_HDCP_KSV_LEN 5
#define DRM_HDCP_RI_LEN 2
#define DRM_HDCP_V_PRIME_PART_LEN 4
#define DRM_HDCP_V_PRIME_NUM_PARTS 5
#define DRM_HDCP_NUM_DOWNSTREAM(x) (x & 0x3f)
#define DRM_HDCP_MAX_CASCADE_EXCEEDED(x) (x & BIT(3))
#define DRM_HDCP_MAX_DEVICE_EXCEEDED(x) (x & BIT(7))
/* Slave address for the HDCP registers in the receiver */
#define DRM_HDCP_DDC_ADDR 0x3A
/* HDCP register offsets for HDMI/DVI devices */
#define DRM_HDCP_DDC_BKSV 0x00
#define DRM_HDCP_DDC_RI_PRIME 0x08
#define DRM_HDCP_DDC_AKSV 0x10
#define DRM_HDCP_DDC_AN 0x18
#define DRM_HDCP_DDC_V_PRIME(h) (0x20 + h * 4)
#define DRM_HDCP_DDC_BCAPS 0x40
#define DRM_HDCP_DDC_BCAPS_REPEATER_PRESENT BIT(6)
#define DRM_HDCP_DDC_BCAPS_KSV_FIFO_READY BIT(5)
#define DRM_HDCP_DDC_BSTATUS 0x41
#define DRM_HDCP_DDC_KSV_FIFO 0x43
#endif

4
include/uapi/drm/drm_mode.h
View File

@ -191,6 +191,10 @@ extern "C" {
DRM_MODE_REFLECT_X | \
DRM_MODE_REFLECT_Y)
/* Content Protection Flags */
#define DRM_MODE_CONTENT_PROTECTION_UNDESIRED 0
#define DRM_MODE_CONTENT_PROTECTION_DESIRED 1
#define DRM_MODE_CONTENT_PROTECTION_ENABLED 2
struct drm_mode_modeinfo {
__u32 clock;