diff options
| author | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-09-10 15:28:06 -0700 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2009-09-10 19:46:07 -0700 |
| commit | 8082400327d8d2ca54254b593644942bed0edd25 (patch) | |
| tree | 43a32ac4e56e985341e2109d2c4d545d3d6df6cb /drivers/gpu/drm/i915/i915_reg.h | |
| parent | 06324194eee97a51b5f172270df49ec39192d6cc (diff) | |
drm/i915: framebuffer compression for pre-GM45
This patch adds framebuffer compression (good for about ~0.5W power
savings in the best case) support for pre-GM45 chips. GM45+ have a new,
more flexible FBC scheme that will be added in a separate patch.
FBC can't always be enabled: the compressed buffer must be physically
contiguous and reside in stolen space. So if you have a large display
and a small amount of stolen memory, you may not be able to take
advantage of FBC. In some cases, a BIOS setting controls how much
stolen space is available. Increasing this to 8 or 16M can help.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_reg.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_reg.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index e38cd21161c8..f7c2de8fdf09 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -343,6 +343,7 @@ #define FBC_CTL_PLANEA (0<<0) #define FBC_CTL_PLANEB (1<<0) #define FBC_FENCE_OFF 0x0321b +#define FBC_TAG 0x03300 #define FBC_LL_SIZE (1536) |