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drm/radeon/kms: try to detect tv vs monitor for underscan

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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: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher
2010-08-20 11:57:19 -04:00
committed by Dave Airlie
parent 4b80d954a7
commit 039ed2d9a2
1 changed files with 14 additions and 1 deletions
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15
drivers/gpu/drm/radeon/radeon_display.c
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@ -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;