[Intel-gfx] [PATCH] drm/i915/skl: port A fuse straps don't work on early SKL steppings
Jesse Barnes
jbarnes at virtuousgeek.org
Fri Mar 6 15:53:32 PST 2015
So try to enumerate eDP unconditionally in those cases.
Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
---
drivers/gpu/drm/i915/intel_display.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 597c10b..8820e8a 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12563,10 +12563,15 @@ 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)
+ 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
--
1.9.1
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