In wait for vblank use usleep_range, which will use hrtimers instead of
msleep. Using msleep(1~20) there are more chances of sleeping for 20ms.
Using usleep_range uses hrtimers and hence are precise, worst case will
trigger an interrupt at the higher/max timeout.
As per kernel document "Documentation/timers/timers-howto.txt" sleeping
for 10us to 20ms its recomended to use usleep_range.
Signed-off-by: Arun R Murthy <arun.r.murthy@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_drv.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 44067bc..29a8664 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -52,7 +52,10 @@
break; \
} \
if (W && drm_can_sleep()) { \
- msleep(W); \
+ if (W > 20) \
+ msleep(W); \
+ else \
+ usleep_range(W * 1000, W * 2 * 1000); \
} else { \
cpu_relax(); \
} \
--
1.7.9.5
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