drm/i915: Respect alternate_ddc_pin for all DDI ports
authorVille Syrjälä <ville.syrjala@linux.intel.com>
Tue, 11 Oct 2016 17:52:46 +0000 (20:52 +0300)
committerJani Nikula <jani.nikula@intel.com>
Mon, 7 Nov 2016 16:22:06 +0000 (18:22 +0200)
commit8d83bc22b259e5526625b6d298f637786c71129f
tree750f4096da98bf2b093a446f23593a7684d88364
parentbc33b0ca11e3df467777a4fa7639ba488c9d4911
drm/i915: Respect alternate_ddc_pin for all DDI ports

The VBT provides the platform a way to mix and match the DDI ports vs.
GMBUS pins. Currently we only trust the VBT for DDI E, which I suppose
has no standard GMBUS pin assignment. However, there are machines out
there that use a non-standard mapping for the other ports as well.
Let's start trusting the VBT on this one for all ports on DDI platforms.

I've structured the code such that other platforms could easily start
using this as well, by simply filling in the ddi_port_info. IIRC there
may be CHV system that might actually need this.

v2: Include a commit message, include a debug message during init

Cc: stable@vger.kernel.org
Cc: Maarten Maathuis <madman2003@gmail.com>
Tested-by: Maarten Maathuis <madman2003@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97877
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1476208368-5710-3-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Jim Bride <jim.bride@linux.intel.com>
(cherry picked from commit e4ab73a13291fc844c9e24d5c347bd95818544d2)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
drivers/gpu/drm/i915/intel_hdmi.c