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drm/i915: Reject 'Center' scaling mode for eDP/DSI on GMCH platforms

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We don't have a LVDS_BORDER_ENABLE type of bit for either eDP or DSI,
and just trying to frob the display timings to include borders results
in a corrupted picture. So reject the 'Center' scaling mode on GMCH
platforms for eDP and DSI.

TODO: Should really filter out the unsupported modes from the prop,
but that would be fairly invasive since the prop is now created and
stored by drm core. So leave it for a rainy day.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1460488478-18311-6-git-send-email-ville.syrjala@linux.intel.com
Tested-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä 2016-04-12 22:14:38 +03:00
parent f4ee265f2f
commit 234126c6c9
2 changed files with 10 additions and 0 deletions
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5
drivers/gpu/drm/i915/intel_dp.c
View File

@ -4821,6 +4821,11 @@ intel_dp_set_property(struct drm_connector *connector,
DRM_DEBUG_KMS("no scaling not supported\n");
return -EINVAL;
}
if (HAS_GMCH_DISPLAY(dev_priv) &&
val == DRM_MODE_SCALE_CENTER) {
DRM_DEBUG_KMS("centering not supported\n");
return -EINVAL;
}
if (intel_connector->panel.fitting_mode == val) {
/* the eDP scaling property is not changed */

5
drivers/gpu/drm/i915/intel_dsi.c
View File

@ -1205,6 +1205,11 @@ static int intel_dsi_set_property(struct drm_connector *connector,
DRM_DEBUG_KMS("no scaling not supported\n");
return -EINVAL;
}
if (HAS_GMCH_DISPLAY(dev) &&
val == DRM_MODE_SCALE_CENTER) {
DRM_DEBUG_KMS("centering not supported\n");
return -EINVAL;
}
if (intel_connector->panel.fitting_mode == val)
return 0;