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 <[email protected]> --- 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 _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
