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drm/i915: Use usleep_range() in wait_for()

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msleep() can sleep for way too long, so switch wait_for() to use
usleep_range() instead. Following a totally unscientific method
I just picked the range as W-2W.

This cuts the i915 init time on my BSW to almost half:
- initcall i915_init+0x0/0xa8 [i915] returned 0 after 419977 usecs
+ initcall i915_init+0x0/0xa8 [i915] returned 0 after 238419 usecs

Note that I didn't perform any other benchmarks on this so far.

Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2015-03-20 21:28:08 +02:00 committed by Daniel Vetter
parent 0b37a9a9eb
commit 9848de082f
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/intel_drv.h
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@ -56,8 +56,8 @@
ret__ = -ETIMEDOUT; \
break; \
} \
if (W && drm_can_sleep()) { \
msleep(W); \
if ((W) && drm_can_sleep()) { \
usleep_range((W)*1000, (W)*2000); \
} else { \
cpu_relax(); \
} \