From: Ben Widawsky Date: Sun, 2 Sep 2012 05:59:50 +0000 (-0700) Subject: drm/i915: Never read FORCEWAKE X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~20^2~15^2~5 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8dee3eea3ccd3b6c00a8d3a08dd715d6adf737dd;p=pandora-kernel.git drm/i915: Never read FORCEWAKE The same designer from the previous patch has told us to never read FORCEWAKE. We only do this for the POSTING_READ(), so simply change that to something within the same cacheline (for no reason in particular other than it sounds nice). In the _mt case we can leverage the gtfifodbg check for the POSTING_READ. This partially reverts commit 6af2d180f82151cf3d58952e35a4f96e45bc453a Author: Daniel Vetter Date: Thu Jul 26 16:24:50 2012 +0200 drm/i915: fix forcewake related hangs on snb v2: commit message, comments about posting read from (Daniel) Note: vlv forcewake doesn't need any changes for this special treatment since FORCEWAKE_VLV is in a totally different register range, and the readback FORCEWAKE_ACK_VLV readback that follows is in the same range. Signed-off-by: Ben Widawsky Acked-by: Chris Wilson [danvet: Added note.] Signed-off-by: Daniel Vetter --- Reading git-diff-tree failed