drm/radeon: add properties to configure the width of the underscan borders

This allows for a more exact fitting on the physical
display. The new properties default to zero which corresponds to the
previous underscan border width[height] formula:
(display_width[display_width] >> 5) + 16.

Example to set a horizontal border width of 30 and a vertikal border
height of 22:

   xrandr --output HDMI-0 --set underscan on --set "underscan hborder" 30 --set "underscan vborder" 22

Signed-off-by: Marius Gröger <marius.groeger@googlemail.com>
Reviewed-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index 17a6602b5885..8e071bf5e250 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -241,6 +241,8 @@ struct radeon_mode_info {
         struct drm_property *tmds_pll_property;
         /* underscan */
         struct drm_property *underscan_property;
+        struct drm_property *underscan_hborder_property;
+        struct drm_property *underscan_vborder_property;
         /* hardcoded DFP edid from BIOS */
         struct edid *bios_hardcoded_edid;
 
@@ -370,6 +372,8 @@ struct radeon_encoder {
         uint32_t pixel_clock;
         enum radeon_rmx_type rmx_type;
         enum radeon_underscan_type underscan_type;
+        uint32_t underscan_hborder;
+        uint32_t underscan_vborder;
         struct drm_display_mode native_mode;
         void *enc_priv;
         int audio_polling_active;