drm/i915: allow 945 to control self refresh (CxSR) automatically
authorAlexander Lam <lambchop468@gmail.com>
Mon, 3 Jan 2011 18:28:56 +0000 (13:28 -0500)
committerChris Wilson <chris@chris-wilson.co.uk>
Wed, 19 Jan 2011 12:38:48 +0000 (12:38 +0000)
commit18b2190ca5bd3f19717421b1591c79c9b0372428
treec55fc64a0ff773a98bbbfc366b8b9600064bd5b8
parentb0b544cd37c060e261afb2cf486296983fcb56da
drm/i915: allow 945 to control self refresh (CxSR) automatically

I changed 945's self refresh to work without the need for the driver to
enable/disable self refresh manually based on the idle state of the gpu.
This is much better than enabling/disabling self refresh for various
reasons, including staying in a lower power state for more time and
avoiding the need for cpu cycles.

This was originally done manually to workaround issues with the hardware
hanging. However, since 944001201: drm/i915: enable low power render
writes on GEN3 hardware, automatic CxSR seems stable.

Signed-off-by: Alexander Lam <lambchop468@gmail.com>
Acked-by : Li Peng <peng.li@linux.intel.com>
[ickle: play safe with the ordering and disable CxSR before tweaking any
watermark and enable afterwards.]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
drivers/gpu/drm/i915/intel_display.c