drm/i915: Workaround to bump rc6 voltage to 450
authorBen Widawsky <ben@bwidawsk.net>
Wed, 26 Sep 2012 17:34:01 +0000 (10:34 -0700)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Tue, 16 Oct 2012 07:23:52 +0000 (09:23 +0200)
commit31643d54a739382626c27c0f2a12b3bbc22d1a38
tree196ed22098e3f2a3890ff53165c038e264b7f85b
parent42c0526c930523425ff6edc95b7235ce7ab9308d
drm/i915: Workaround to bump rc6 voltage to 450

BIOS should be setting the minimum voltage for rc6 to be 450mV. Old or
buggy BIOSen may not be doing this, so we correct it for them. Ideally
customers should update the BIOS as only it would know the optimal
values for the platform, so we leave that fact as a DRM_ERROR for the
user to see.

Unfortunately this isn't fixing any of the issues it was targeted to
fix, but it is documented that we must do it.

CC: Jesse Barnes <jbarnes@virtuousgeek.org>
CC: Matt Turner <mattst88@gmail.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: bikeshedded loglevel of the "your bios is broken message" to
debug.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drivers/gpu/drm/i915/i915_reg.h
drivers/gpu/drm/i915/intel_pm.c