diff options
| author | Gajanan Bhat <gajanan.bhat@intel.com> | 2014-08-05 23:15:54 +0530 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-08-08 17:44:00 +0200 |
| commit | a398e9c79eea74ba2f3f24ac08902661682f008c (patch) | |
| tree | 43cb0ab75a3ea8947b4a50a380219223b93abb9b /drivers/gpu/drm/i915/intel_pm.c | |
| parent | 0948c2651413d56c90d7ee9c99d75bef82d4c351 (diff) | |
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>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_pm.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_pm.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index de27439636e..19bd7212f4a 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -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; } |