drm/i915/skl: port A fuse straps don't work on early SKL steppings
authorJesse Barnes <jbarnes@virtuousgeek.org>
Fri, 6 Mar 2015 23:53:32 +0000 (15:53 -0800)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Tue, 17 Mar 2015 21:30:09 +0000 (22:30 +0100)
So try to enumerate eDP unconditionally in those cases.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: Add wa tag Damien dug out.]
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drivers/gpu/drm/i915/intel_display.c

index 43d3575d7d20e3e719fcd940a6f7e8e14b47c921..31eaa7caf12751bf226be2781f44ff293ad4d1a5 100644 (file)
@@ -12583,10 +12583,15 @@ static void intel_setup_outputs(struct drm_device *dev)
        if (HAS_DDI(dev)) {
                int found;
 
-               /* Haswell uses DDI functions to detect digital outputs */
+               /*
+                * Haswell uses DDI functions to detect digital outputs.
+                * On SKL pre-D0 the strap isn't connected, so we assume
+                * it's there.
+                */
                found = I915_READ(DDI_BUF_CTL_A) & DDI_INIT_DISPLAY_DETECTED;
-               /* DDI A only supports eDP */
-               if (found)
+               /* WaIgnoreDDIAStrap: skl */
+               if (found ||
+                   (IS_SKYLAKE(dev) && INTEL_REVID(dev) < SKL_REVID_D0))
                        intel_ddi_init(dev, PORT_A);
 
                /* DDI B, C and D detection is indicated by the SFUSE_STRAP