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drm/i915: Clean up DDI DDC/AUX CH sanitation

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Now that we use the AUX and GMBUS assignment from VBT for all ports,
let's clean up the sanitization of the port information a bit.
Previosuly we only did this for port E, and only complained about a
non-standard assignment for the other ports. But as we know that
non-standard assignments are a fact of life, let's expand the
sanitization to all the ports.

v2: Include a commit message, fix up the comments a bit
v3: Don't clobber other ports if the current port has no alternate aux ch/ddc pin

Cc: stable@vger.kernel.org
Cc: Maarten Maathuis <madman2003@gmail.com>
Tested-by: Maarten Maathuis <madman2003@gmail.com>
References: https://bugs.freedesktop.org/show_bug.cgi?id=97877
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1476208368-5710-4-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Jim Bride <jim.bride@linux.intel.com> (v2)
This commit is contained in:
Ville Syrjälä 2016-10-11 20:52:47 +03:00
parent e4ab73a132
commit 9454fa871e
1 changed files with 77 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

122
drivers/gpu/drm/i915/intel_bios.c
View File

@ -1035,6 +1035,77 @@ static u8 translate_iboost(u8 val)
return mapping[val];
}
static void sanitize_ddc_pin(struct drm_i915_private *dev_priv,
enum port port)
{
const struct ddi_vbt_port_info *info =
&dev_priv->vbt.ddi_port_info[port];
enum port p;
if (!info->alternate_ddc_pin)
return;
for_each_port_masked(p, (1 << port) - 1) {
struct ddi_vbt_port_info *i = &dev_priv->vbt.ddi_port_info[p];
if (info->alternate_ddc_pin != i->alternate_ddc_pin)
continue;
DRM_DEBUG_KMS("port %c trying to use the same DDC pin (0x%x) as port %c, "
"disabling port %c DVI/HDMI support\n",
port_name(p), i->alternate_ddc_pin,
port_name(port), port_name(p));
/*
* If we have multiple ports supposedly sharing the
* pin, then dvi/hdmi couldn't exist on the shared
* port. Otherwise they share the same ddc bin and
* system couldn't communicate with them separately.
*
* Due to parsing the ports in alphabetical order,
* a higher port will always clobber a lower one.
*/
i->supports_dvi = false;
i->supports_hdmi = false;
i->alternate_ddc_pin = 0;
}
}
static void sanitize_aux_ch(struct drm_i915_private *dev_priv,
enum port port)
{
const struct ddi_vbt_port_info *info =
&dev_priv->vbt.ddi_port_info[port];
enum port p;
if (!info->alternate_aux_channel)
return;
for_each_port_masked(p, (1 << port) - 1) {
struct ddi_vbt_port_info *i = &dev_priv->vbt.ddi_port_info[p];
if (info->alternate_aux_channel != i->alternate_aux_channel)
continue;
DRM_DEBUG_KMS("port %c trying to use the same AUX CH (0x%x) as port %c, "
"disabling port %c DP support\n",
port_name(p), i->alternate_aux_channel,
port_name(port), port_name(p));
/*
* If we have multiple ports supposedlt sharing the
* aux channel, then DP couldn't exist on the shared
* port. Otherwise they share the same aux channel
* and system couldn't communicate with them separately.
*
* Due to parsing the ports in alphabetical order,
* a higher port will always clobber a lower one.
*/
i->supports_dp = false;
i->alternate_aux_channel = 0;
}
}
static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
const struct bdb_header *bdb)
{
@ -1109,54 +1180,15 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
if (is_dvi) {
if (port == PORT_E) {
info->alternate_ddc_pin = ddc_pin;
/* if DDIE share ddc pin with other port, then
* dvi/hdmi couldn't exist on the shared port.
* Otherwise they share the same ddc bin and system
* couldn't communicate with them seperately. */
if (ddc_pin == DDC_PIN_B) {
dev_priv->vbt.ddi_port_info[PORT_B].supports_dvi = 0;
dev_priv->vbt.ddi_port_info[PORT_B].supports_hdmi = 0;
} else if (ddc_pin == DDC_PIN_C) {
dev_priv->vbt.ddi_port_info[PORT_C].supports_dvi = 0;
dev_priv->vbt.ddi_port_info[PORT_C].supports_hdmi = 0;
} else if (ddc_pin == DDC_PIN_D) {
dev_priv->vbt.ddi_port_info[PORT_D].supports_dvi = 0;
dev_priv->vbt.ddi_port_info[PORT_D].supports_hdmi = 0;
}
} else if (ddc_pin == DDC_PIN_B && port != PORT_B)
DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
else if (ddc_pin == DDC_PIN_C && port != PORT_C)
DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
else if (ddc_pin == DDC_PIN_D && port != PORT_D)
DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
info->alternate_ddc_pin = ddc_pin;
sanitize_ddc_pin(dev_priv, port);
}
if (is_dp) {
if (port == PORT_E) {
info->alternate_aux_channel = aux_channel;
/* if DDIE share aux channel with other port, then
* DP couldn't exist on the shared port. Otherwise
* they share the same aux channel and system
* couldn't communicate with them seperately. */
if (aux_channel == DP_AUX_A)
dev_priv->vbt.ddi_port_info[PORT_A].supports_dp = 0;
else if (aux_channel == DP_AUX_B)
dev_priv->vbt.ddi_port_info[PORT_B].supports_dp = 0;
else if (aux_channel == DP_AUX_C)
dev_priv->vbt.ddi_port_info[PORT_C].supports_dp = 0;
else if (aux_channel == DP_AUX_D)
dev_priv->vbt.ddi_port_info[PORT_D].supports_dp = 0;
}
else if (aux_channel == DP_AUX_A && port != PORT_A)
DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
else if (aux_channel == DP_AUX_B && port != PORT_B)
DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
else if (aux_channel == DP_AUX_C && port != PORT_C)
DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
else if (aux_channel == DP_AUX_D && port != PORT_D)
DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
info->alternate_aux_channel = aux_channel;
sanitize_aux_ch(dev_priv, port);
}
if (bdb->version >= 158) {