Cannon Lake's VBT that is currently available for B0 stepping
states that port D uses alternate pin 3 messing up with the
default pin-port mapping table. Using that information we cannot
get HDMI working properly. So for now we don't relly on VBT for
this information.
Cc: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_bios.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 639d45c..82b144c 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -1187,6 +1187,15 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
if (is_dvi) {
info->alternate_ddc_pin = ddc_pin;
+ /*
+ * All VBTs that we got so far for B Stepping has this
+ * information wrong for Port D. So, let's just ignore for now.
+ */
+ if (IS_CNL_REVID(dev_priv, CNL_REVID_B0, CNL_REVID_B0) &&
+ port == PORT_D) {
+ info->alternate_ddc_pin = 0;
+ }
+
sanitize_ddc_pin(dev_priv, port);
}
--
1.9.1
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