drm/i915: Enable lspcon initialization

This patch adds initialization code for lspcon.
What we are doing here is:
	- Check if lspcon is configured in VBT for this port
	- If lspcon is configured, initialize it and configure it
          as DP port.

V2: Addressed Ville's review comments:
- Not adding AVI IF functions for LSPCON display now.
  This part will be added once the dig_port level AVI-IF series
  gets merged.

V3: Rebase
V4: Rebase
V5: Rebase
V6: Rebase

Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1476455212-27893-5-git-send-email-shashank.sharma@intel.com

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index a76afd7a6616bb4834ea32a7f67407ba6d4fded2..7f7741c1406dc1117972a286e757c89a0558cbc8 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -2438,7 +2438,7 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
        struct intel_digital_port *intel_dig_port;
        struct intel_encoder *intel_encoder;
        struct drm_encoder *encoder;
-       bool init_hdmi, init_dp;
+       bool init_hdmi, init_dp, init_lspcon = false;
        int max_lanes;
 
        if (I915_READ(DDI_BUF_CTL(PORT_A)) & DDI_A_4_LANES) {
@@ -2470,6 +2470,19 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
        init_hdmi = (dev_priv->vbt.ddi_port_info[port].supports_dvi ||
                     dev_priv->vbt.ddi_port_info[port].supports_hdmi);
        init_dp = dev_priv->vbt.ddi_port_info[port].supports_dp;
+
+       if (intel_bios_is_lspcon_present(dev_priv, port)) {
+               /*
+                * Lspcon device needs to be driven with DP connector
+                * with special detection sequence. So make sure DP
+                * is initialized before lspcon.
+                */
+               init_dp = true;
+               init_lspcon = true;
+               init_hdmi = false;
+               DRM_DEBUG_KMS("VBT says port %c has lspcon\n", port_name(port));
+       }
+
        if (!init_dp && !init_hdmi) {
                DRM_DEBUG_KMS("VBT says port %c is not DVI/HDMI/DP compatible, respect it\n",
                              port_name(port));
@@ -2546,6 +2559,20 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
                        goto err;
        }
 
+       if (init_lspcon) {
+               if (lspcon_init(intel_dig_port))
+                       /* TODO: handle hdmi info frame part */
+                       DRM_DEBUG_KMS("LSPCON init success on port %c\n",
+                               port_name(port));
+               else
+                       /*
+                        * LSPCON init faied, but DP init was success, so
+                        * lets try to drive as DP++ port.
+                        */
+                       DRM_ERROR("LSPCON init failed on port %c\n",
+                               port_name(port));
+       }
+
        return;
 
 err: