This is a note to let you know that I've just added the patch titled
drm/amd/display: Fix VRR cannot enable
to the 6.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-display-fix-vrr-cannot-enable.patch
and it can be found in the queue-6.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0bab536fec7ba5d5bc256828b9eda7e30e817f3c
Author: Tom Chung <chiahsuan.chung@xxxxxxx>
Date: Wed Jul 3 16:47:57 2024 +0800
drm/amd/display: Fix VRR cannot enable
[ Upstream commit f91a9af09dea850d83d4b217b8acbafd97b5c61f ]
[Why]
Sometimes the VRR cannot enable after login to the desktop.
User space may call the DRM_IOCTL_MODE_GETCONNECTOR right after
the DRM_IOCTL_MODE_RMFB.
After calling DRM_IOCTL_MODE_RMFB to remove all the frame buffer
and it will cause the driver to disable the crtc and disable the
link while calling the link_set_dpms_off().
It will cause the dpcd read failed in amdgpu_dm_update_freesync_caps()
while try to get the DP_MSA_TIMING_PAR_IGNORED capability and think
the sink side does not support VRR.
[How]
Use the dpcd_caps.allow_invalid_MSA_timing_param flag instead of
reading from dpcd directly.
dpcd_caps.allow_invalid_MSA_timing_param flag is updated during HPD.
It is safe to replace the original method.
Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@xxxxxxx>
Signed-off-by: Jerry Zuo <jerry.zuo@xxxxxxx>
Signed-off-by: Tom Chung <chiahsuan.chung@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index a705e7fa18c06..9ee54c5ce4a61 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -11812,25 +11812,6 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
return ret;
}
-static bool is_dp_capable_without_timing_msa(struct dc *dc,
- struct amdgpu_dm_connector *amdgpu_dm_connector)
-{
- u8 dpcd_data;
- bool capable = false;
-
- if (amdgpu_dm_connector->dc_link &&
- dm_helpers_dp_read_dpcd(
- NULL,
- amdgpu_dm_connector->dc_link,
- DP_DOWN_STREAM_PORT_COUNT,
- &dpcd_data,
- sizeof(dpcd_data))) {
- capable = (dpcd_data & DP_MSA_TIMING_PAR_IGNORED) ? true:false;
- }
-
- return capable;
-}
-
static bool dm_edid_parser_send_cea(struct amdgpu_display_manager *dm,
unsigned int offset,
unsigned int total_length,
@@ -12133,8 +12114,8 @@ void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
sink->sink_signal == SIGNAL_TYPE_EDP)) {
bool edid_check_required = false;
- if (is_dp_capable_without_timing_msa(adev->dm.dc,
- amdgpu_dm_connector)) {
+ if (amdgpu_dm_connector->dc_link &&
+ amdgpu_dm_connector->dc_link->dpcd_caps.allow_invalid_MSA_timing_param) {
if (edid->features & DRM_EDID_FEATURE_CONTINUOUS_FREQ) {
amdgpu_dm_connector->min_vfreq = connector->display_info.monitor_range.min_vfreq;
amdgpu_dm_connector->max_vfreq = connector->display_info.monitor_range.max_vfreq;
