drm/amdgpu/display: restore the backlight on modeset (v2)

To stay consistent with the user's setting.

v2: rebase on multi-eDP support

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1337
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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 8a27666..1896086 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -9093,6 +9093,12 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
        /* Update audio instances for each connector. */
        amdgpu_dm_commit_audio(dev, state);
 
+#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) ||          \
+       defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
+       /* restore the backlight level */
+       if (dm->backlight_dev)
+               amdgpu_dm_backlight_set_level(dm, dm->brightness[0]);
+#endif
        /*
         * send vblank event on all events not handled in flip and
         * mark consumed event for drm_atomic_helper_commit_hw_done