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drm/i915: rc6 residency (fix the fix)

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Chris' fix for my 32b breakage was incorrect. do_div returns a
remainder. Go back to a divide macro which is more 32b friendly.

Tested on x86-64.

This has only been compile tested on 32b systems.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=48756
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Sincere-apologies: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ben Widawsky <benjamin.widawsky@intel.com>
[danvet: fixup 32bit compile-fail.]
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2012-04-20 11:50:01 -07:00 committed by Daniel Vetter
parent 3801a7fd86
commit a85d4bcb8a
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/i915_sysfs.c
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@ -39,8 +39,8 @@ static u32 calc_residency(struct drm_device *dev, const u32 reg)
if (!intel_enable_rc6(dev))
return 0;
raw_time = I915_READ(reg) * 128ULL + 500;
return do_div(raw_time, 100000);
raw_time = I915_READ(reg) * 128ULL;
return DIV_ROUND_UP_ULL(raw_time, 100000);
}
static ssize_t