From: Paulo Zanoni Date: Fri, 2 Aug 2013 19:22:24 +0000 (-0300) Subject: drm/i915: check the power well when redisabling VGA X-Git-Tag: v3.12-rc1~136^2~14^2~36 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8dc8a27c9733a41cda84e8c70da8313e1d54c4ae;p=pandora-kernel.git drm/i915: check the power well when redisabling VGA If the power well is disabled VGA is guaranteed to be disabled. This fixes unclaimed register messages that happen on suspend/resume. v2: Check the actual hw power well state instead of our own tracking to make sure VGA is _really_ off (in case the BIOS/KVMr has just its own request bit set). Requested by Ville. Note: Ville suggested whether it wouldn't be better to just enable the power well over a slightly longer time in our resume code, since we already do that. I tend to agree, but there's also the modeset force code in the lid notifier which _also_ eventually calls redisable_vga. We shouldn't ever need this on somewhat modern hw (everything with opregion essentially) but the code to bail out isn't there. Hence stick with this simple approach here for now. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=67517 Signed-off-by: Paulo Zanoni [danvet: Summarize the discussion around the resume sequence and lid notifier a bit.] Signed-off-by: Daniel Vetter --- Reading git-diff-tree failed