[PATCH 1/2] drm/dp: Add quirk to disable Panel Replay on certain panels

[Jouni Högander <jouni.hogander@intel.com>]

We are currently observing problems with LG panel when Panel Replay is
enabled. Add new quirk DP_DPCD_QUIRK_NO_PANEL_REPLAY and set it for
the problematic panel model.

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
---
 drivers/gpu/drm/display/drm_dp_helper.c | 2 ++
 include/drm/display/drm_dp_helper.h     | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c
index a697cc227e28..96c8b53ba4e4 100644
--- a/drivers/gpu/drm/display/drm_dp_helper.c
+++ b/drivers/gpu/drm/display/drm_dp_helper.c
@@ -2540,6 +2540,8 @@ static const struct dpcd_quirk dpcd_quirk_list[] = {
 	{ OUI(0x00, 0x22, 0xb9), DEVICE_ID_ANY, true, BIT(DP_DPCD_QUIRK_CONSTANT_N) },
 	/* LG LP140WF6-SPM1 eDP panel */
 	{ OUI(0x00, 0x22, 0xb9), DEVICE_ID('s', 'i', 'v', 'a', 'r', 'T'), false, BIT(DP_DPCD_QUIRK_CONSTANT_N) },
+	/* Problems observed with LG panel */
+	{ OUI(0x00, 0x22, 0xb9), DEVICE_ID_ANY, false, BIT(DP_DPCD_QUIRK_NO_PANEL_REPLAY) },
 	/* Apple panels need some additional handling to support PSR */
 	{ OUI(0x00, 0x10, 0xfa), DEVICE_ID_ANY, false, BIT(DP_DPCD_QUIRK_NO_PSR) },
 	/* CH7511 seems to leave SINK_COUNT zeroed */
diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h
index 1d0acd58f486..ca36b5a9c1b6 100644
--- a/include/drm/display/drm_dp_helper.h
+++ b/include/drm/display/drm_dp_helper.h
@@ -824,6 +824,14 @@ enum drm_dp_quirk {
 	 * driver still need to implement proper handling for such device.
 	 */
 	DP_DPCD_QUIRK_NO_PSR,
+	/**
+	 * @DP_DPCD_QUIRK_NO_PANEL_REPLAY:
+	 *
+	 * The device does not support Panel Replay even if reports
+	 * that it supports or driver still need to implement proper
+	 * handling for such device.
+	 */
+	DP_DPCD_QUIRK_NO_PANEL_REPLAY,
 	/**
 	 * @DP_DPCD_QUIRK_NO_SINK_COUNT:
 	 *
-- 
2.43.0