From: Guenter Roeck Date: Tue, 9 Jul 2013 23:00:31 +0000 (-0700) Subject: Partially revert "drm/i915: unconditionally use mt forcewake on hsw/ivb" X-Git-Tag: v3.11-rc2~17^2~2^2~3 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c11e5f35ab490bd30591563816fbc83526521777;p=pandora-kernel.git Partially revert "drm/i915: unconditionally use mt forcewake on hsw/ivb" This patch partially reverts commit 36ec8f877481449bdfa072e6adf2060869e2b970 for IvyBridge CPUs. The original commit results in repeated 'Timed out waiting for forcewake old ack to clear' messages on a Supermicro C7H61 board (BIOS version 2.00 and 2.00b) with i7-3770K CPU. It ultimately results in a hangup if the system is highly loaded. Reverting the commit for IvyBridge CPUs fixes the issue. Issue a warning if the CPU is IvyBridge and mt forcewake is disabled, since this condition can result in secondary issues. v2: Only revert patch for Ivybridge CPUs Issue info message if mt forcewake is disabled on Ivybridge Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=60541 Cc: Jesse Barnes Cc: Daniel Vetter Cc: Mika Kuoppala Signed-off-by: Guenter Roeck Cc: stable@vger.kernel.org Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=66139 Signed-off-by: Daniel Vetter --- Reading git-diff-tree failed