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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2011-07-08 12:22:40 +0100 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2011-07-08 10:23:12 -0700 |
| commit | 9ce9d0695d15da23ffe817516ba5d0b58caf8d05 (patch) | |
| tree | e836095751192032f732dceb94d9329f0c8b4121 /drivers/gpu | |
| parent | de568510cd410d82d370d3000808aca63ef28a22 (diff) | |
| download | op-kernel-dev-9ce9d0695d15da23ffe817516ba5d0b58caf8d05.zip op-kernel-dev-9ce9d0695d15da23ffe817516ba5d0b58caf8d05.tar.gz | |
drm/i915: Set persistent-mode for ILK/SNB framebuffer compression
Persistent mode is intended for use with front-buffer rendering, such as
X, where it is necessary to detect writes to the scanout either by the
GPU or through the CPU's fence, and recompress the dirty regions on the
fly. (By comparison to the back-buffer rendering, the scanout is always
recompressed after a page-flip.)
References: https://bugs.freedesktop.org/show_bug.cgi?id=33487
References: https://bugs.freedesktop.org/show_bug.cgi?id=31742
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_reg.h | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 2 |
2 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 4a446b1..96fb0fa 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -579,6 +579,7 @@ #define DPFC_CTL_PLANEA (0<<30) #define DPFC_CTL_PLANEB (1<<30) #define DPFC_CTL_FENCE_EN (1<<29) +#define DPFC_CTL_PERSISTENT_MODE (1<<25) #define DPFC_SR_EN (1<<10) #define DPFC_CTL_LIMIT_1X (0<<6) #define DPFC_CTL_LIMIT_2X (1<<6) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 31c7526..9df96bd 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -1581,6 +1581,8 @@ static void ironlake_enable_fbc(struct drm_crtc *crtc, unsigned long interval) dpfc_ctl &= DPFC_RESERVED; dpfc_ctl |= (plane | DPFC_CTL_LIMIT_1X); + /* Set persistent mode for front-buffer rendering, ala X. */ + dpfc_ctl |= DPFC_CTL_PERSISTENT_MODE; dpfc_ctl |= (DPFC_CTL_FENCE_EN | dev_priv->cfb_fence); I915_WRITE(ILK_DPFC_CHICKEN, DPFC_HT_MODIFY); |
