From: Ville Syrjälä <ville.syrj...@linux.intel.com>
DDI A and E share some of the lanes, so check that we have enough
lanes for the purpose we need before registering the encoders.
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
drivers/gpu/drm/i915/intel_ddi.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index b9d6b038ea0c..e903d9c87680 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -3278,6 +3278,33 @@ void intel_ddi_init(struct drm_device *dev, enum port
port)
struct intel_encoder *intel_encoder;
struct drm_encoder *encoder;
bool init_hdmi, init_dp;
+ int max_lanes;
+
+ if (I915_READ(DDI_BUF_CTL(PORT_A)) & DDI_A_4_LANES) {
+ switch (port) {
+ case PORT_A:
+ max_lanes = 4;
+ break;
+ case PORT_E:
+ max_lanes = 0;
+ break;
+ default:
+ max_lanes = 4;
+ break;
+ }
+ } else {
+ switch (port) {
+ case PORT_A:
+ max_lanes = 2;
+ break;
+ case PORT_E:
+ max_lanes = 2;
+ break;
+ default:
+ max_lanes = 4;
+ break;
+ }
+ }
init_hdmi = (dev_priv->vbt.ddi_port_info[port].supports_dvi ||
dev_priv->vbt.ddi_port_info[port].supports_hdmi);
@@ -3288,6 +3315,15 @@ void intel_ddi_init(struct drm_device *dev, enum port
port)
return;
}
+ if (WARN(max_lanes == 0,
+ "No lanes for port %c\n", port_name(port)))
+ return;
+
+ if (WARN(init_hdmi && max_lanes < 4,
+ "Not enough lanes (%d) for HDMI on port %c\n",
+ max_lanes, port_name(port)))
+ init_hdmi = false;
+
intel_dig_port = kzalloc(sizeof(*intel_dig_port), GFP_KERNEL);
if (!intel_dig_port)
return;
--
2.4.10
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