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

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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
This commit is contained in:
Rodrigo Vivi 2017-07-06 14:08:15 -07:00
parent 17369ba08c
commit 75be7756bc
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/i915/intel_bios.c
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@ -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);
}