xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drm/radeon/dpm: Disable sclk switching on Oland when two 4K 60Hz monitors are connected

Browse Source 
commit 227545b9a08c68778ddd89428f99c351fc9315ac upstream.

Screen flickers rapidly when two 4K 60Hz monitors are in use. This issue
doesn't happen when one monitor is 4K 60Hz (pixelclock 594MHz) and
another one is 4K 30Hz (pixelclock 297MHz).

The issue is gone after setting "power_dpm_force_performance_level" to
"high". Following the indication, we found that the issue occurs when
sclk is too low.

So resolve the issue by disabling sclk switching when there are two
monitors requires high pixelclock (> 297MHz).

v2:
 - Only apply the fix to Oland.
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kai-Heng Feng
2021-04-30 12:56:56 +08:00
committed by Greg Kroah-Hartman
parent bccb7dd137
commit 5a6fe45a3a
3 changed files with 12 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/drm/radeon/radeon_pm.c
View File

@@ -1747,6 +1747,7 @@ static void radeon_pm_compute_clocks_dpm(struct radeon_device *rdev)
struct drm_device *ddev = rdev->ddev;
struct drm_crtc *crtc;
struct radeon_crtc *radeon_crtc;
struct radeon_connector *radeon_connector;
if (!rdev->pm.dpm_enabled)
return;
@@ -1756,6 +1757,7 @@ static void radeon_pm_compute_clocks_dpm(struct radeon_device *rdev)
/* update active crtc counts */
rdev->pm.dpm.new_active_crtcs = 0;
rdev->pm.dpm.new_active_crtc_count = 0;
rdev->pm.dpm.high_pixelclock_count = 0;
if (rdev->num_crtc && rdev->mode_info.mode_config_initialized) {
list_for_each_entry(crtc,
&ddev->mode_config.crtc_list, head) {
@@ -1763,6 +1765,12 @@ static void radeon_pm_compute_clocks_dpm(struct radeon_device *rdev)
if (crtc->enabled) {
rdev->pm.dpm.new_active_crtcs |= (1 << radeon_crtc->crtc_id);
rdev->pm.dpm.new_active_crtc_count++;
if (!radeon_crtc->connector)
continue;
radeon_connector = to_radeon_connector(radeon_crtc->connector);
if (radeon_connector->pixelclock_for_modeset > 297000)
rdev->pm.dpm.high_pixelclock_count++;
}
}
}