github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-30 10:04:04 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

drm/amd/pm: Disable MCLK switching on SI at high pixel clocks

Browse Source 
On various SI GPUs, a flickering can be observed near the bottom
edge of the screen when using a single 4K 60Hz monitor over DP.
Disabling MCLK switching works around this problem.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Timur Kristóf 2025-09-26 20:26:12 +02:00 committed by Alex Deucher
parent 9858ea4c29
commit 5c05bcf6ae
1 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpu/drm/amd/pm/legacy-dpm/si_dpm.c
View File

@ -3500,6 +3500,11 @@ static void si_apply_state_adjust_rules(struct amdgpu_device *adev,
* for these GPUs to calculate bandwidth requirements.
*/
if (high_pixelclock_count) {
/* Work around flickering lines at the bottom edge
* of the screen when using a single 4K 60Hz monitor.
*/
disable_mclk_switching = true;
/* On Oland, we observe some flickering when two 4K 60Hz
* displays are connected, possibly because voltage is too low.
* Raise the voltage by requiring a higher SCLK.