commit 5bccf5e32f010ac4d99e1eafb8669cfb35a0889a
author Marius Gröger <marius.groeger@googlemail.com> Tue Sep 21 21:30:59 2010 +0200
committer Dave Airlie <airlied@redhat.com> Wed Oct 06 11:46:20 2010 +1000
tree 9d1174cc1b0ff129edab3d380ba03d5cfcd2eed2
parent d0f8a854c340986359a3b0a97e380c71def7a440

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>

drivers/gpu/drm/radeon/radeon_display.c

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index b92d2f2..902f7ce 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -1002,6 +1002,24 @@
 				      radeon_underscan_enum_list[i].name);
 	}
 
+	rdev->mode_info.underscan_hborder_property =
+		drm_property_create(rdev->ddev,
+					DRM_MODE_PROP_RANGE,
+					"underscan hborder", 2);
+	if (!rdev->mode_info.underscan_hborder_property)
+		return -ENOMEM;
+	rdev->mode_info.underscan_hborder_property->values[0] = 0;
+	rdev->mode_info.underscan_hborder_property->values[1] = 128;
+
+	rdev->mode_info.underscan_vborder_property =
+		drm_property_create(rdev->ddev,
+					DRM_MODE_PROP_RANGE,
+					"underscan vborder", 2);
+	if (!rdev->mode_info.underscan_vborder_property)
+		return -ENOMEM;
+	rdev->mode_info.underscan_vborder_property->values[0] = 0;
+	rdev->mode_info.underscan_vborder_property->values[1] = 128;
+
 	return 0;
 }
 
@@ -1159,8 +1177,14 @@
 			     ((radeon_encoder->underscan_type == UNDERSCAN_AUTO) &&
 			      drm_detect_hdmi_monitor(radeon_connector->edid) &&
 			      is_hdtv_mode(mode)))) {
-				radeon_crtc->h_border = (mode->hdisplay >> 5) + 16;
-				radeon_crtc->v_border = (mode->vdisplay >> 5) + 16;
+				if (radeon_encoder->underscan_hborder != 0)
+					radeon_crtc->h_border = radeon_encoder->underscan_hborder;
+				else
+					radeon_crtc->h_border = (mode->hdisplay >> 5) + 16;
+				if (radeon_encoder->underscan_vborder != 0)
+					radeon_crtc->v_border = radeon_encoder->underscan_vborder;
+				else
+					radeon_crtc->v_border = (mode->vdisplay >> 5) + 16;
 				radeon_crtc->rmx_type = RMX_FULL;
 				src_v = crtc->mode.vdisplay;
 				dst_v = crtc->mode.vdisplay - (radeon_crtc->v_border * 2);