[Intel-gfx] [PATCH] drm/i915: Clear the VBT defaults for unused ports

[Manasi Navare]

If during VBT parsing we find that the port is unused,
the driver code just bails out without clearing the
defaults for that port. This can cause failures down
the path through link training for unused Port.
This patch fixes this issue by clearing the defaults
before bailing out from the VBT parsing function.

Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
---
 drivers/gpu/drm/i915/intel_bios.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index e144f03..3ac3d24 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -1148,9 +1148,15 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
 			}
 		}
 	}
-	if (!child)
-		return;
+	if (!child) {
+		/* Clear the DDI VBT Port info values */
+		info->supports_dvi = 0;
+		info->supports_hdmi = 0;
+		info->supports_dp = 0;
+		info->supports_edp = 0;
 
+		return;
+	}
 	aux_channel = child->common.aux_channel;
 	ddc_pin = child->common.ddc_pin;
 
-- 
2.1.4