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drm/i915/skl: WaIgnoreDDIAStrap is forever, always init DDI A

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There is currently conflicting documentation on which steppings the
workaround is needed, up to C vs. forever. However there is post-C
stepping hardware that doesn't report port presence on DDI A, leading to
black screen on eDP. Assume the strap isn't connected, and try to enable
DDI A on these machines. (We'll still check the VBT for the info in DDI
init.)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Mika Westerberg <mika.westerberg@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jani Nikula 2015-08-14 10:53:17 +03:00 committed by Daniel Vetter
parent f79b468eca
commit 5a2376d136
1 changed files with 1 additions and 2 deletions
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3
drivers/gpu/drm/i915/intel_display.c
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@ -13945,8 +13945,7 @@ static void intel_setup_outputs(struct drm_device *dev)
*/
found = I915_READ(DDI_BUF_CTL_A) & DDI_INIT_DISPLAY_DETECTED;
/* WaIgnoreDDIAStrap: skl */
if (found ||
(IS_SKYLAKE(dev) && INTEL_REVID(dev) < SKL_REVID_D0))
if (found || IS_SKYLAKE(dev))
intel_ddi_init(dev, PORT_A);
/* DDI B, C and D detection is indicated by the SFUSE_STRAP