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drm/i915: Add wait_for_us

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

v2:
  * Fix atomic waits. (Dave Gordon)
  * Use USEC_PER_SEC and USEC_PER_MSEC. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Dave Gordon <david.s.gordon@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Tvrtko Ursulin
2016-03-03 14:36:41 +00:00
parent 782d25cac6
commit 3f177625ee
3 changed files with 12 additions and 10 deletions
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15
drivers/gpu/drm/i915/intel_drv.h
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@@ -45,8 +45,8 @@
* having timed out, since the timeout could be due to preemption or similar and
* we've never had a chance to check the condition before the timeout.
*/
#define _wait_for(COND, MS, W) ({ \
unsigned long timeout__ = jiffies + msecs_to_jiffies(MS) + 1; \
#define _wait_for(COND, US, W) ({ \
unsigned long timeout__ = jiffies + usecs_to_jiffies(US) + 1; \
int ret__ = 0; \
while (!(COND)) { \
if (time_after(jiffies, timeout__)) { \
@@ -55,7 +55,7 @@
break; \
} \
if ((W) && drm_can_sleep()) { \
usleep_range((W)*1000, (W)*2000); \
usleep_range((W), (W)*2); \
} else { \
cpu_relax(); \
} \
@@ -63,10 +63,11 @@
ret__; \
})
#define wait_for(COND, MS) _wait_for(COND, MS, 1)
#define wait_for_atomic(COND, MS) _wait_for(COND, MS, 0)
#define wait_for_atomic_us(COND, US) _wait_for((COND), \
DIV_ROUND_UP((US), 1000), 0)
#define wait_for(COND, MS) _wait_for((COND), (MS) * 1000, 1000)
#define wait_for_us(COND, US) _wait_for((COND), (US), 1)
#define wait_for_atomic(COND, MS) _wait_for((COND), (MS) * 1000, 0)
#define wait_for_atomic_us(COND, US) _wait_for((COND), (US), 0)
#define KHz(x) (1000 * (x))
#define MHz(x) KHz(1000 * (x))