drm/i915: Allow 27 bytes child_dev for VBT <109
authorVille Syrjälä <ville.syrjala@linux.intel.com>
Mon, 14 Dec 2015 16:23:46 +0000 (18:23 +0200)
committerVille Syrjälä <ville.syrjala@linux.intel.com>
Tue, 12 Jan 2016 14:12:12 +0000 (16:12 +0200)
commit52b69c849ab4a343e696a0e45d557550f15450a6
tree2cfc00525e7d7d8e1e3732994e10dba2b13db392
parentb7792d8b54cc0e66b94d625d70761d086cad1dd3
drm/i915: Allow 27 bytes child_dev for VBT <109

My 85x has VBT version 108 which has a child dev size of 27 bytes.
Let's allow that without printing an error.

We still want to reject the actual parsin since for that we need
the child device size to be at least 33 bytes. So we should still
check for that, but let's make it print a debug message only instead
of an error.

While at it, toss in a BUILD_BUG_ON() to verify our struct
old_child_dev_config is in fact 33 bytes.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1450110229-30450-8-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
drivers/gpu/drm/i915/intel_bios.c