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drm/amd/display: Restore correct backlight brightness after a GPU reset

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commit 5760388d9681ac743038b846b9082b9023969551 upstream.

[Why]
GPU reset will attempt to restore cached state, but brightness doesn't
get restored. It will come back at 100% brightness, but userspace thinks
it's the previous value.

[How]
When running resume sequence if GPU is in reset restore brightness
to previous value.

Acked-by: Wayne Lin <Wayne.Lin@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 5e19e2b57b6bb640d68dfc7991e1e182922cf867)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mario Limonciello
2025-02-23 00:04:35 -06:00
committed by Greg Kroah-Hartman
parent e8aeee0d12
commit 889e55f2fa
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -230,6 +230,10 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
static void handle_hpd_irq_helper(struct amdgpu_dm_connector *aconnector);
static void handle_hpd_rx_irq(void *param);
static void amdgpu_dm_backlight_set_level(struct amdgpu_display_manager *dm,
int bl_idx,
u32 user_brightness);
static bool
is_timing_unchanged_for_freesync(struct drm_crtc_state *old_crtc_state,
struct drm_crtc_state *new_crtc_state);
@@ -2885,6 +2889,12 @@ static int dm_resume(void *handle)
mutex_unlock(&dm->dc_lock);
/* set the backlight after a reset */
for (i = 0; i < dm->num_of_edps; i++) {
if (dm->backlight_dev[i])
amdgpu_dm_backlight_set_level(dm, i, dm->brightness[i]);
}
return 0;
}
/* Recreate dc_state - DC invalidates it when setting power state to S3. */