amd/display: set backlight only if required

commit 4052287a75eb3fc0f487fcc5f768a38bede455c8 upstream.

[Why]
comparing pwm bl values (coverted) with user brightness(converted)
levels in commit_tail leads to continuous setting of backlight via dmub
as they don't to match.
This leads overdrive in queuing of commands to DMCU that sometimes lead
to depending on load on DMCU fw:

"[drm:dc_dmub_srv_wait_idle] *ERROR* Error waiting for DMUB idle: status=3"

[How]
Store last successfully set backlight value and compare with it instead
of pwm reads which is not what we should compare with.

Signed-off-by: Shirish S <shirish.s@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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 b9859e5..7e9e2eb 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3522,7 +3522,7 @@ static u32 convert_brightness_to_user(const struct amdgpu_dm_backlight_caps *cap
                                 max - min);
 }
 
-static int amdgpu_dm_backlight_set_level(struct amdgpu_display_manager *dm,
+static void amdgpu_dm_backlight_set_level(struct amdgpu_display_manager *dm,
                                         int bl_idx,
                                         u32 user_brightness)
 {
@@ -3550,7 +3550,8 @@ static int amdgpu_dm_backlight_set_level(struct amdgpu_display_manager *dm,
                        DRM_DEBUG("DM: Failed to update backlight on eDP[%d]\n", bl_idx);
        }
 
-       return rc ? 0 : 1;
+       if (rc)
+               dm->actual_brightness[bl_idx] = user_brightness;
 }
 
 static int amdgpu_dm_backlight_update_status(struct backlight_device *bd)
@@ -9316,7 +9317,7 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
        /* restore the backlight level */
        for (i = 0; i < dm->num_of_edps; i++) {
                if (dm->backlight_dev[i] &&
-                   (amdgpu_dm_backlight_get_level(dm, i) != dm->brightness[i]))
+                   (dm->actual_brightness[i] != dm->brightness[i]))
                        amdgpu_dm_backlight_set_level(dm, i, dm->brightness[i]);
        }
 #endif

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
index d1d353a..46d6e65 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
@@ -446,6 +446,12 @@ struct amdgpu_display_manager {
         * cached backlight values.
         */
        u32 brightness[AMDGPU_DM_MAX_NUM_EDP];
+       /**
+        * @actual_brightness:
+        *
+        * last successfully applied backlight values.
+        */
+       u32 actual_brightness[AMDGPU_DM_MAX_NUM_EDP];
 };
 
 enum dsc_clock_force_state {