drm/radeon/kms: use LCD physical size from vbios tables if available

Some systems have the LCD width and height in mm available in the
LCD info table.  Use this info if there is no EDID to provide it.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index ac882639b3ed..35c5ff09040d 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1500,6 +1500,9 @@ struct radeon_encoder_atom_dig *radeon_atombios_get_lvds_info(struct
                 if (misc & ATOM_DOUBLE_CLOCK_MODE)
                         lvds->native_mode.flags |= DRM_MODE_FLAG_DBLSCAN;
 
+                lvds->native_mode.width_mm = lvds_info->info.sLCDTiming.usImageHSize;
+                lvds->native_mode.height_mm = lvds_info->info.sLCDTiming.usImageVSize;
+
                 /* set crtc values */
                 drm_mode_set_crtcinfo(&lvds->native_mode, CRTC_INTERLACE_HALVE_V);