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 --- drivers/gpu/drm/radeon/radeon_display.c | 15 ++++++++++++++- 1 files changed, 14 insertions(+), 1 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c index d49a148..5ca8ce7 100644 --- a/drivers/gpu/drm/radeon/radeon_display.c +++ b/drivers/gpu/drm/radeon/radeon_display.c @@ -1099,6 +1099,18 @@ 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) @@ -1146,7 +1158,8 @@ 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;