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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/drm/i915/intel_display.c | |
| parent | de568510cd410d82d370d3000808aca63ef28a22 (diff) | |
| download | lwn-9ce9d0695d15da23ffe817516ba5d0b58caf8d05.tar.gz lwn-9ce9d0695d15da23ffe817516ba5d0b58caf8d05.zip | |
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/drm/i915/intel_display.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 31c75266a456..9df96bdc002e 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); |