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Commit 9848de08 authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Daniel Vetter
Browse files

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



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: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 0b37a9a9

drivers/gpu/drm/i915/intel_drv.h

+2 −2
Original line number Diff line number Diff line
@@ -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();					\

		}							\