drm/i915: Check VBT for port presence in addition to the strap on VLV/CHV

[firefly-linux-kernel-4.4.55.git] / drivers / gpu / drm / i915 / intel_display.c

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a95445fc46d61a37eb691139f26817894cd74ba0..a3254c3bcc7c0b28bf2b6f707b8377e62dde1343 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -14160,7 +14160,7 @@ static void intel_setup_outputs(struct drm_device *dev)
                if (I915_READ(PCH_DP_D) & DP_DETECTED)
                        intel_dp_init(dev, PCH_DP_D, PORT_D);
        } else if (IS_VALLEYVIEW(dev)) {
-               bool has_edp;
+               bool has_edp, has_port;
 
                /*
                 * The DP_DETECTED bit is the latched state of the DDC
@@ -14170,25 +14170,37 @@ static void intel_setup_outputs(struct drm_device *dev)
                 * Thus we can't rely on the DP_DETECTED bit alone to detect
                 * eDP ports. Consult the VBT as well as DP_DETECTED to
                 * detect eDP ports.
+                *
+                * Sadly the straps seem to be missing sometimes even for HDMI
+                * ports (eg. on Voyo V3 - CHT x7-Z8700), so check both strap
+                * and VBT for the presence of the port. Additionally we can't
+                * trust the port type the VBT declares as we've seen at least
+                * HDMI ports that the VBT claim are DP or eDP.
                 */
                has_edp = intel_dp_is_edp(dev, PORT_B);
-               if (I915_READ(VLV_DP_B) & DP_DETECTED || has_edp)
+               has_port = intel_bios_is_port_present(dev_priv, PORT_B);
+               if (I915_READ(VLV_DP_B) & DP_DETECTED || has_port)
                        has_edp &= intel_dp_init(dev, VLV_DP_B, PORT_B);
-               if (I915_READ(VLV_HDMIB) & SDVO_DETECTED && !has_edp)
+               if ((I915_READ(VLV_HDMIB) & SDVO_DETECTED || has_port) && !has_edp)
                        intel_hdmi_init(dev, VLV_HDMIB, PORT_B);
 
                has_edp = intel_dp_is_edp(dev, PORT_C);
-               if (I915_READ(VLV_DP_C) & DP_DETECTED || has_edp)
+               has_port = intel_bios_is_port_present(dev_priv, PORT_C);
+               if (I915_READ(VLV_DP_C) & DP_DETECTED || has_port)
                        has_edp &= intel_dp_init(dev, VLV_DP_C, PORT_C);
-               if (I915_READ(VLV_HDMIC) & SDVO_DETECTED && !has_edp)
+               if ((I915_READ(VLV_HDMIC) & SDVO_DETECTED || has_port) && !has_edp)
                        intel_hdmi_init(dev, VLV_HDMIC, PORT_C);
 
                if (IS_CHERRYVIEW(dev)) {
-                       /* eDP not supported on port D, so don't check VBT */
-                       if (I915_READ(CHV_HDMID) & SDVO_DETECTED)
-                               intel_hdmi_init(dev, CHV_HDMID, PORT_D);
-                       if (I915_READ(CHV_DP_D) & DP_DETECTED)
+                       /*
+                        * eDP not supported on port D,
+                        * so no need to worry about it
+                        */
+                       has_port = intel_bios_is_port_present(dev_priv, PORT_D);
+                       if (I915_READ(CHV_DP_D) & DP_DETECTED || has_port)
                                intel_dp_init(dev, CHV_DP_D, PORT_D);
+                       if (I915_READ(CHV_HDMID) & SDVO_DETECTED || has_port)
+                               intel_hdmi_init(dev, CHV_HDMID, PORT_D);
                }
 
                intel_dsi_init(dev);