drm/radeon: add get_backlight_level callback

Read back the backlight level from the hw.
Needed for proper backlight restoration on resume.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 4d67f0f5a5a3..de86b8e259ce 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -1174,6 +1174,8 @@ struct radeon_asic {
                 void (*wait_for_vblank)(struct radeon_device *rdev, int crtc);
                 /* set backlight level */
                 void (*set_backlight_level)(struct radeon_encoder *radeon_encoder, u8 level);
+                /* get backlight level */
+                u8 (*get_backlight_level)(struct radeon_encoder *radeon_encoder);
         } display;
         /* copy functions for bo handling */
         struct {
@@ -1767,6 +1769,7 @@ void radeon_ring_write(struct radeon_ring *ring, uint32_t v);
 #define radeon_irq_process(rdev) (rdev)->asic->irq.process((rdev))
 #define radeon_get_vblank_counter(rdev, crtc) (rdev)->asic->display.get_vblank_counter((rdev), (crtc))
 #define radeon_set_backlight_level(rdev, e, l) (rdev)->asic->display.set_backlight_level((e), (l))
+#define radeon_get_backlight_level(rdev, e) (rdev)->asic->display.get_backlight_level((e))
 #define radeon_fence_ring_emit(rdev, r, fence) (rdev)->asic->ring[(r)].emit_fence((rdev), (fence))
 #define radeon_semaphore_ring_emit(rdev, r, cp, semaphore, emit_wait) (rdev)->asic->ring[(r)].emit_semaphore((rdev), (cp), (semaphore), (emit_wait))
 #define radeon_copy_blit(rdev, s, d, np, f) (rdev)->asic->copy.blit((rdev), (s), (d), (np), (f))