leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

drm/i915: Simplify VLV drain latency computation

Browse Source 
The current drain lantency computation relies on hardcoded limits to
determine when the to use the low vs. high precision multiplier.
Rewrite the code to use a more straightforward approach.

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2015-03-05 21:19:43 +02:00 committed by Daniel Vetter
parent 120305166a
commit abfc00b545
1 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/gpu/drm/i915/intel_pm.c
View File

@ -755,12 +755,15 @@ static bool vlv_compute_drain_latency(struct drm_crtc *crtc,
return false;
entries = DIV_ROUND_UP(clock, 1000) * pixel_size;
if (IS_CHERRYVIEW(dev))
*prec_mult = (entries > 32) ? 16 : 8;
else
*prec_mult = (entries > 128) ? 64 : 32;
*prec_mult = IS_CHERRYVIEW(dev) ? 16 : 64;
*drain_latency = (64 * (*prec_mult) * 4) / entries;
if (*drain_latency > DRAIN_LATENCY_MASK) {
*prec_mult /= 2;
*drain_latency = (64 * (*prec_mult) * 4) / entries;
}
if (*drain_latency > DRAIN_LATENCY_MASK)
*drain_latency = DRAIN_LATENCY_MASK;