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drm/i915: Fix HSW parity test

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Haswell changed the log registers to be WO, so we can no longer read
them to determine the programming (which sucks, see later note). For
now, simply use the cached value, and hope HW doesn't screw us over.

v2: Simplify the logic to avoid an extra !, remove last, and fix the
buffer offset which broke along the rebase (Ville)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=57441
CC: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2013-09-17 21:12:42 -07:00 committed by Daniel Vetter
parent 644db711d3
commit 1c966dd26b
1 changed files with 13 additions and 1 deletions
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14
drivers/gpu/drm/i915/i915_sysfs.c
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@ -133,6 +133,17 @@ i915_l3_read(struct file *filp, struct kobject *kobj,
if (ret)
return ret;
if (IS_HASWELL(drm_dev)) {
if (dev_priv->l3_parity.remap_info)
memcpy(buf,
dev_priv->l3_parity.remap_info + (offset/4),
count);
else
memset(buf, 0, count);
goto out;
}
misccpctl = I915_READ(GEN7_MISCCPCTL);
I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);
@ -141,9 +152,10 @@ i915_l3_read(struct file *filp, struct kobject *kobj,
I915_WRITE(GEN7_MISCCPCTL, misccpctl);
out:
mutex_unlock(&drm_dev->struct_mutex);
return i;
return count;
}
static ssize_t