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drm/i915: Round-up clock and limit drain latency 

Round up clock computation and limit drain latency to maximum of 0x7F.

Signed-off-by: Gajanan Bhat <gajanan.bhat@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Gajanan Bhat 2014-08-05 23:15:54 +05:30 committed by Daniel Vetter
parent 0948c26514
commit a398e9c79e
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/i915/intel_pm.c
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@ -1285,11 +1285,14 @@ static bool vlv_compute_drain_latency(struct drm_crtc *crtc,
if (WARN(pixel_size == 0, "Pixel size is zero!\n"))
return false;
entries = (clock / 1000) * pixel_size;
entries = DIV_ROUND_UP(clock, 1000) * pixel_size;
*prec_mult = (entries > 128) ? DRAIN_LATENCY_PRECISION_64 :
DRAIN_LATENCY_PRECISION_32;
*drain_latency = (64 * (*prec_mult) * 4) / entries;
if (*drain_latency > DRAIN_LATENCY_MASK)
*drain_latency = DRAIN_LATENCY_MASK;
return true;
}