drm/i915/skl: port A fuse straps don't work on early SKL steppings
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>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 43d3575..31eaa7c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12583,10 +12583,15 @@
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