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drm/i915: use cpu_relax() in wait_for_atomic 

As part of the advice given to us from the hardware designers regarding
the maximum wait time on the forcewake handshake we need to move from us
granularity to ms granularity. In earlier patches to do this, Jani
noticed that wait_for_us was properly converted to use cpu_relax(), but
wait_for was not.

The issue has existed since the introduction of the macro:
commit 913d8d1100
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Sat Aug 7 11:01:35 2010 +0100

    drm/i915: Ensure that while(INREG()) are bounded (v2)

CC: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Chris Wilson <chris@chris-wilson.oc.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2012-09-01 22:59:48 -07:00 committed by Daniel Vetter
parent b67a4376d5
commit 0cc2764cc4
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/i915/intel_drv.h
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@ -41,7 +41,11 @@
ret__ = -ETIMEDOUT; \ ret__ = -ETIMEDOUT; \
break; \ break; \
} \ } \
if (W && drm_can_sleep()) msleep(W); \ if (W && drm_can_sleep()) { \
msleep(W); \
} else { \
cpu_relax(); \
} \
} \ } \
ret__; \ ret__; \
}) })