Re: [PATCH 2/2] drm/i915: fall back to bit-banging if GMBUS fails in CRT EDID reads

On Mon, Aug 13, 2012 at 01:22:35PM +0300, Jani Nikula wrote:

GMBUS was enabled over bit-banging as the default in commits:

commit c3dfefa0a6d235bd465309e12f4c56ea16e71111 Author: Daniel Vetter daniel.vetter@ffwll.ch Date: Tue Feb 14 22:37:25 2012 +0100

drm/i915: reenable gmbus on gen3+ again

and

commit 0fb3f969c8683505fb7323c06bf8a999a5a45a15 Author: Daniel Vetter daniel.vetter@ffwll.ch Date: Fri Mar 2 19:38:30 2012 +0100

drm/i915: enable gmbus on gen2

Unfortunately, GMBUS seems to fail on some CRT displays. Add a bit-banging fallback to CRT EDID reads.

LKML-Reference: 201207251020.47637.maciej.rutecki@gmail.com Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=45881 Signed-off-by: Jani Nikula jani.nikula@intel.com

Patches applied to -fixes with the tested-by result from the bug report. I've also put a cc: stable on both of them, since the regression is already in 3.4.

Thanks, Daniel