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drm/i915: Check max number of lanes when registering DDI ports

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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.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1449597590-6971-3-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2015-12-08 19:59:37 +02:00
parent d919161b67
commit 10e7bec38b
1 changed files with 36 additions and 0 deletions
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36
drivers/gpu/drm/i915/intel_ddi.c
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@ -3282,6 +3282,33 @@ 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);
@ -3292,6 +3319,15 @@ 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;