Re: [PATCH 01/12] drm/i915: Add wait_for_us

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On 02/02/16 11:57, Chris Wilson wrote:
On Tue, Feb 02, 2016 at 11:06:19AM +0000, Tvrtko Ursulin wrote:
From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

This is for callers who want micro-second precision but are not
waiting from the atomic context.

linux/time.h provides us with USEC_PER_MSEC that would help to break up
these large numbers better for human consumption.

2000 -> 2*USEC_PER_SEC
10 -> 10*USEC_PER_MSEC

Maybe:

#define wait_for_seconds(x) ((x)*USEC_PER_SEC)
#define wait_for_milliseconds(x) ((x)*USEC_PER_MSEC)

if (_wait_for((I915_READ(pp_stat_reg) & mask) == value,
	      wait_for_seconds(5) /* timeout */,
	      wait_for_millseconds(10) /* interval */))

There are only two callers where it would be a bit interesting so it just feels like needless change to me at the moment. Better to keep the established conventions for these two macros.

@@ -55,7 +55,7 @@
  			break;						\
  		}							\
  		if ((W) && drm_can_sleep()) {				\

Note after the atomic conversion, we can also do the !atomic assert here
and kill the drm_can_sleep() check

Noted. Maybe I'll put a comment somewhere.

Regards,

Tvrtko
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