drm/radeon: track whether the GPU controls the backlight (v2)

A table in the vbios tells us whether the GPU backlight controller
is used or not.  If the bit is set, the GPU backlight controller is
used; if it is not set, an off-chip backlight controller is used.

v2: store all the firmware flags, not just BL control

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

2 files changed, 6 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index d67d4f3eb6f4..e368b3027cba 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1254,6 +1254,10 @@ bool radeon_atom_get_clock_info(struct drm_device *dev)
                 if (rdev->clock.max_pixel_clock == 0)
                         rdev->clock.max_pixel_clock = 40000;
 
+                /* not technically a clock, but... */
+                rdev->mode_info.firmware_flags =
+                        le16_to_cpu(firmware_info->info.usFirmwareCapability.susAccess);
+
                 return true;
         }
 
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index d56978949f34..806140d32b5d 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -252,6 +252,8 @@ struct radeon_mode_info {
 
         /* pointer to fbdev info structure */
         struct radeon_fbdev *rfbdev;
+        /* firmware flags */
+        u16 firmware_flags;
 };
 
 #define MAX_H_CODE_TIMING_LEN 32