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drm/dp: Add DP_DPCD_QUIRK_NO_SINK_COUNT

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CH7511 eDP->LVDS bridge doesn't seem to set SINK_COUNT properly
causing i915 to detect it as disconnected. Add a quirk to ignore
SINK_COUNT on these devices.

Cc: David S. <david@majinbuu.com>
Cc: Peteris Rudzusiks <peteris.rudzusiks@gmail.com>
Tested-by: Peteris Rudzusiks <peteris.rudzusiks@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105406
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190528140650.19230-1-ville.syrjala@linux.intel.com
Acked-by: Jani Nikula <jani.nikula@intel.com> #irc
This commit is contained in:
Ville Syrjälä 2019-05-28 17:06:49 +03:00
parent 41ff5bd834
commit 7974033e52
2 changed files with 10 additions and 1 deletions
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4
drivers/gpu/drm/drm_dp_helper.c
View File

@ -1280,7 +1280,9 @@ static const struct dpcd_quirk dpcd_quirk_list[] = {
/* LG LP140WF6-SPM1 eDP panel */
{ OUI(0x00, 0x22, 0xb9), DEVICE_ID('s', 'i', 'v', 'a', 'r', 'T'), false, BIT(DP_DPCD_QUIRK_CONSTANT_N) },
/* Apple panels need some additional handling to support PSR */
{ OUI(0x00, 0x10, 0xfa), DEVICE_ID_ANY, false, BIT(DP_DPCD_QUIRK_NO_PSR) }
{ OUI(0x00, 0x10, 0xfa), DEVICE_ID_ANY, false, BIT(DP_DPCD_QUIRK_NO_PSR) },
/* CH7511 seems to leave SINK_COUNT zeroed */
{ OUI(0x00, 0x00, 0x00), DEVICE_ID('C', 'H', '7', '5', '1', '1'), false, BIT(DP_DPCD_QUIRK_NO_SINK_COUNT) },
};
#undef OUI

7
include/drm/drm_dp_helper.h
View File

@ -1414,6 +1414,13 @@ enum drm_dp_quirk {
* driver still need to implement proper handling for such device.
*/
DP_DPCD_QUIRK_NO_PSR,
/**
* @DP_DPCD_QUIRK_NO_SINK_COUNT:
*
* The device does not set SINK_COUNT to a non-zero value.
* The driver should ignore SINK_COUNT during detection.
*/
DP_DPCD_QUIRK_NO_SINK_COUNT,
};
/**