lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

drm/i915: Set persistent-mode for ILK/SNB framebuffer compression

Browse Source 
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>
This commit is contained in:
Chris Wilson
2011-07-08 12:22:40 +01:00
committed by Keith Packard
parent de568510cd
commit 9ce9d0695d
2 changed files with 3 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/i915/intel_display.c
View File

@@ -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);