Commit 75be7756 authored Jul 06, 2017 by Rodrigo Vivi

drm/i915/cnl: Don't trust VBT's alternate pin for port D for now.



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@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Clinton Taylor <clinton.a.taylor@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1499375295-6454-1-git-send-email-rodrigo.vivi@intel.com

parent 17369ba0

drivers/gpu/drm/i915/intel_bios.c

+9 −0

Original line number	Original line	Diff line number	Diff line
	@@ -1187,6 +1187,15 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
	if (is_dvi) {		if (is_dvi) {
	info->alternate_ddc_pin = ddc_pin;		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);		sanitize_ddc_pin(dev_priv, port);
	}		}