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Commit 039ed2d9 authored by Alex Deucher's avatar Alex Deucher Committed by Dave Airlie
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drm/radeon/kms: try to detect tv vs monitor for underscan 



When enabling underscan for hdmi monitors, attempt to detect
whether we are driving a TV or a monitor.  The should hopefully
prevent underscan from being enabled on monitors attached via
hdmi that do not overscan the image.  Only enable underscan
if the mode is a common hdtv mode (480p, 720p, etc.).

Signed-off-by: default avatarAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 4b80d954

drivers/gpu/drm/radeon/radeon_display.c

+14 −1
Original line number Diff line number Diff line
@@ -1094,6 +1094,18 @@ void radeon_modeset_fini(struct radeon_device *rdev) 
	radeon_i2c_fini(rdev);

}



static bool is_hdtv_mode(struct drm_display_mode *mode)

{

	/* try and guess if this is a tv or a monitor */

	if ((mode->vdisplay == 480 && mode->hdisplay == 720) || /* 480p */

	    (mode->vdisplay == 576) || /* 576p */

	    (mode->vdisplay == 720) || /* 720p */

	    (mode->vdisplay == 1080)) /* 1080p */

		return true;

	else

		return false;

}



bool radeon_crtc_scaling_mode_fixup(struct drm_crtc *crtc,

				struct drm_display_mode *mode,

				struct drm_display_mode *adjusted_mode)
@@ -1141,7 +1153,8 @@ bool radeon_crtc_scaling_mode_fixup(struct drm_crtc *crtc, 
			if (ASIC_IS_AVIVO(rdev) &&

			    ((radeon_encoder->underscan_type == UNDERSCAN_ON) ||

			     ((radeon_encoder->underscan_type == UNDERSCAN_AUTO) &&

			      drm_detect_hdmi_monitor(radeon_connector->edid)))) {

			      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;

				radeon_crtc->rmx_type = RMX_FULL;