From 477321e0130c58f7fc3e41753ad95e934aaa7abc Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Thu, 28 Jul 2016 17:50:40 +0300 Subject: [PATCH] drm/i915: Reject mixing MST and SST/HDMI on the same digital port MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit We can't mix MST with SST/HDMI on the same physical port, so we'll need to reject such configurations in check_digital_port_conflicts(). Nothing else will prevent this as MST has its fake encoders and its own connectors so the cloning checks won't catch this. The same digital port can be used multiple times, but only if all the encoders involved are MST encoders, so we only want to check MST vs. SST/HDMI, not MST vs. MST. And SST/HDMI vs. SST/HDMI we already check. Cc: Maarten Lankhorst Signed-off-by: Ville Syrjälä Link: http://patchwork.freedesktop.org/patch/msgid/1469717448-4297-5-git-send-email-ville.syrjala@linux.intel.com Reviewed-by: Maarten Lankhorst Reviewed-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_display.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index da9dcacd49d5..483ddfe957f4 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -12300,6 +12300,7 @@ static bool check_digital_port_conflicts(struct drm_atomic_state *state) struct drm_device *dev = state->dev; struct drm_connector *connector; unsigned int used_ports = 0; + unsigned int used_mst_ports = 0; /* * Walk the connector list instead of the encoder @@ -12336,11 +12337,20 @@ static bool check_digital_port_conflicts(struct drm_atomic_state *state) return false; used_ports |= port_mask; + break; + case INTEL_OUTPUT_DP_MST: + used_mst_ports |= + 1 << enc_to_mst(&encoder->base)->primary->port; + break; default: break; } } + /* can't mix MST and SST/HDMI on the same port */ + if (used_ports & used_mst_ports) + return false; + return true; } -- 2.39.2