tree 9262c62e16108554fb626cb04189d17e449bb938
parent 99a2008d0b32d72dfc2a54e7be1eb698dd2e3bd6
author Wang Xingchao <xingchao.wang@linux.intel.com> 1369922831 +0800
committer Daniel Vetter <daniel.vetter@ffwll.ch> 1370532736 +0200

i915/drm: Add private api for power well usage

Haswell Display audio depends on power well in graphic side, it should
request power well before use it and release power well after use.
I915 will not shutdown power well if it detects audio is using.
This patch protects display audio crash for Intel Haswell C3 stepping board.

Signed-off-by: Wang Xingchao <xingchao.wang@linux.intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>