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platform/chrome: cros_ec_typec: Add Displayport Alternatemode 2.1 Support

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Displayport Alternatemode 2.1 requires cable capabilities such as cable
signalling, cable type, DPAM version which then will be used by mux
driver for displayport configuration. These capabilities can be derived
from the Cable VDO.

Acked-by: Prashant Malani <pmalani@chromium.org>
Signed-off-by: Utkarsh Patel <utkarsh.h.patel@intel.com>
Link: https://lore.kernel.org/r/20230920023243.2494410-5-utkarsh.h.patel@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Utkarsh Patel 2023-09-19 19:32:42 -07:00 committed by Greg Kroah-Hartman
parent f9ee604328
commit 70ca6c7312
1 changed files with 28 additions and 0 deletions
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28
drivers/platform/chrome/cros_ec_typec.c
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@ -492,6 +492,8 @@ static int cros_typec_enable_dp(struct cros_typec_data *typec,
{
struct cros_typec_port *port = typec->ports[port_num];
struct typec_displayport_data dp_data;
u32 cable_tbt_vdo;
u32 cable_dp_vdo;
int ret;
if (typec->pd_ctrl_ver < 2) {
@ -524,6 +526,32 @@ static int cros_typec_enable_dp(struct cros_typec_data *typec,
port->state.data = &dp_data;
port->state.mode = TYPEC_MODAL_STATE(ffs(pd_ctrl->dp_mode));
/* Get cable VDO for cables with DPSID to check DPAM2.1 is supported */
cable_dp_vdo = cros_typec_get_cable_vdo(port, USB_TYPEC_DP_SID);
/**
* Get cable VDO for thunderbolt cables and cables with DPSID but does not
* support DPAM2.1.
*/
cable_tbt_vdo = cros_typec_get_cable_vdo(port, USB_TYPEC_TBT_SID);
if (cable_dp_vdo & DP_CAP_DPAM_VERSION) {
dp_data.conf |= cable_dp_vdo;
} else if (cable_tbt_vdo) {
dp_data.conf |= TBT_CABLE_SPEED(cable_tbt_vdo) << DP_CONF_SIGNALLING_SHIFT;
/* Cable Type */
if (cable_tbt_vdo & TBT_CABLE_OPTICAL)
dp_data.conf |= DP_CONF_CABLE_TYPE_OPTICAL << DP_CONF_CABLE_TYPE_SHIFT;
else if (cable_tbt_vdo & TBT_CABLE_RETIMER)
dp_data.conf |= DP_CONF_CABLE_TYPE_RE_TIMER << DP_CONF_CABLE_TYPE_SHIFT;
else if (cable_tbt_vdo & TBT_CABLE_ACTIVE_PASSIVE)
dp_data.conf |= DP_CONF_CABLE_TYPE_RE_DRIVER << DP_CONF_CABLE_TYPE_SHIFT;
} else if (PD_IDH_PTYPE(port->c_identity.id_header) == IDH_PTYPE_PCABLE) {
dp_data.conf |= VDO_TYPEC_CABLE_SPEED(port->c_identity.vdo[0]) <<
DP_CONF_SIGNALLING_SHIFT;
}
ret = cros_typec_retimer_set(port->retimer, port->state);
if (!ret)
ret = typec_mux_set(port->mux, &port->state);