From c750bdd3e7e204cc88b32806c3864487a03cd84b Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Mon, 13 Feb 2017 19:58:18 +0200 Subject: [PATCH] drm/i915: Reject HDMI 12bpc if the sink doesn't indicate support MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Check that the sink really declared 12bpc support before we enable it. This should not actually never happen since it's mandatory for HDMI sinks to support 12bpc if they support any deep color modes. But reality disagrees with the theory and there are actually sinks in the wild that violate the spec. v2: Fix the output_types check Update commit message to state that these things are in fact real Cc: stable@vger.kernel.org Cc: Nicholas Sielicki Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99250 Signed-off-by: Ville Syrjälä Link: http://patchwork.freedesktop.org/patch/msgid/20170213175818.24958-1-ville.syrjala@linux.intel.com Reviewed-by: Shashank Sharma --- drivers/gpu/drm/i915/intel_hdmi.c | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c index c2184f755ec6..3eec74ca5116 100644 --- a/drivers/gpu/drm/i915/intel_hdmi.c +++ b/drivers/gpu/drm/i915/intel_hdmi.c @@ -1297,16 +1297,34 @@ intel_hdmi_mode_valid(struct drm_connector *connector, static bool hdmi_12bpc_possible(struct intel_crtc_state *crtc_state) { - struct drm_device *dev = crtc_state->base.crtc->dev; + struct drm_i915_private *dev_priv = + to_i915(crtc_state->base.crtc->dev); + struct drm_atomic_state *state = crtc_state->base.state; + struct drm_connector_state *connector_state; + struct drm_connector *connector; + int i; - if (HAS_GMCH_DISPLAY(to_i915(dev))) + if (HAS_GMCH_DISPLAY(dev_priv)) return false; /* * HDMI 12bpc affects the clocks, so it's only possible * when not cloning with other encoder types. */ - return crtc_state->output_types == 1 << INTEL_OUTPUT_HDMI; + if (crtc_state->output_types != 1 << INTEL_OUTPUT_HDMI) + return false; + + for_each_connector_in_state(state, connector, connector_state, i) { + const struct drm_display_info *info = &connector->display_info; + + if (connector_state->crtc != crtc_state->base.crtc) + continue; + + if ((info->edid_hdmi_dc_modes & DRM_EDID_HDMI_DC_36) == 0) + return false; + } + + return true; } bool intel_hdmi_compute_config(struct intel_encoder *encoder, -- 2.20.1