diff options
| author | Timur Kristóf <timur.kristof@gmail.com> | 2025-09-26 20:26:12 +0200 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2025-10-13 14:14:14 -0400 |
| commit | 5c05bcf6ae7732da1bd4dc1958d527b5f07f216a (patch) | |
| tree | b56e989aef61dffa37f739ef9cdf237c9c946e6c | |
| parent | 9858ea4c29c283f0a8a3cdbb42108d464ece90a8 (diff) | |
drm/amd/pm: Disable MCLK switching on SI at high pixel clocks
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>
| -rw-r--r-- | drivers/gpu/drm/amd/pm/legacy-dpm/si_dpm.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/pm/legacy-dpm/si_dpm.c b/drivers/gpu/drm/amd/pm/legacy-dpm/si_dpm.c index cf9932e68055..3a9522c17fee 100644 --- a/drivers/gpu/drm/amd/pm/legacy-dpm/si_dpm.c +++ b/drivers/gpu/drm/amd/pm/legacy-dpm/si_dpm.c @@ -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. |