diff options
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dp.c | 53 |
1 files changed, 52 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index fcab9de..a86af0d 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -35,6 +35,7 @@ #include "i915_drv.h" #include "intel_dp.h" + #define DP_LINK_STATUS_SIZE 6 #define DP_LINK_CHECK_TIMEOUT (10 * 1000) @@ -1228,7 +1229,53 @@ intel_dp_hot_plug(struct intel_output *intel_output) if (dp_priv->dpms_mode == DRM_MODE_DPMS_ON) intel_dp_check_link_status(intel_output); } - +/* + * Enumerate the child dev array parsed from VBT to check whether + * the given DP is present. + * If it is present, return 1. + * If it is not present, return false. + * If no child dev is parsed from VBT, it is assumed that the given + * DP is present. + */ +int dp_is_present_in_vbt(struct drm_device *dev, int dp_reg) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct child_device_config *p_child; + int i, dp_port, ret; + + if (!dev_priv->child_dev_num) + return 1; + + dp_port = 0; + if (dp_reg == DP_B || PCH_DP_B) + dp_port = PORT_IDPB; + else if (dp_reg == DP_C || PCH_DP_C) + dp_port = PORT_IDPC; + else if (dp_reg == DP_D || PCH_DP_D) + dp_port = PORT_IDPD; + + ret = 0; + for (i = 0; i < dev_priv->child_dev_num; i++) { + p_child = dev_priv->child_dev + i; + /* + * If the device type is not DP, continue. + */ + if (p_child->device_type != DEVICE_TYPE_DP && + p_child->device_type != DEVICE_TYPE_eDP) + continue; + /* Find the eDP port */ + if (dp_reg == DP_A && p_child->device_type == DEVICE_TYPE_eDP) { + ret = 1; + break; + } + /* Find the DP port */ + if (p_child->dvo_port == dp_port) { + ret = 1; + break; + } + } + return ret; +} void intel_dp_init(struct drm_device *dev, int output_reg) { @@ -1238,6 +1285,10 @@ intel_dp_init(struct drm_device *dev, int output_reg) struct intel_dp_priv *dp_priv; const char *name = NULL; + if (!dp_is_present_in_vbt(dev, output_reg)) { + DRM_DEBUG_KMS("DP is not present. Ignore it\n"); + return; + } intel_output = kcalloc(sizeof(struct intel_output) + sizeof(struct intel_dp_priv), 1, GFP_KERNEL); if (!intel_output) |
