From: Keith Packard <keithp@keithp.com>
To: Chris Wilson <chris@chris-wilson.co.uk>, intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH 7/8] drm/i915: Re-enable self-refresh
Date: Fri, 18 Mar 2011 08:22:16 -0700 [thread overview]
Message-ID: <yunei64zc5z.fsf@aiko.keithp.com> (raw)
In-Reply-To: <1300435330-15934-8-git-send-email-chris@chris-wilson.co.uk>
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On Fri, 18 Mar 2011 08:02:09 +0000, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> A broken implementation of is_pot() prevented the detection of when a
> singular pipe was enabled.
> - return mask && (mask & -mask) == 0;
> + return mask && (mask & -mask) == mask;
I think the form
mask && (mask & (mask - 1)) == 0
is easier to reason about.
But, your fix is also correct as it finds the lowest bit set in 'mask'
and checks to see if that is the same as mask.
Reviewed-by: Keith Packard <keithp@keithp.com>
--
keith.packard@intel.com
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next prev parent reply other threads:[~2011-03-18 15:22 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-18 8:02 Patch queue for -fixes Chris Wilson
2011-03-18 8:02 ` [PATCH 1/8] drm/i915: Remove surplus POSTING_READs before wait_for_vblank Chris Wilson
2011-03-18 14:42 ` Keith Packard
2011-03-18 16:23 ` Jesse Barnes
2011-03-18 8:02 ` [PATCH 2/8] drm/i915: skip redundant operations whilst enabling pipes and planes Chris Wilson
2011-03-18 14:46 ` Keith Packard
2011-03-18 16:25 ` Jesse Barnes
2011-03-18 17:37 ` Chris Wilson
2011-03-18 17:41 ` Jesse Barnes
2011-03-18 8:02 ` [PATCH 3/8] drm/i915: Flush the plane enable using the DSPCNTR latch Chris Wilson
2011-03-18 15:09 ` Keith Packard
2011-03-18 16:26 ` Jesse Barnes
2011-03-18 17:42 ` Chris Wilson
2011-03-18 8:02 ` [PATCH 4/8] drm/i915: Only wait for vblank after pipe enabling on gen2 Chris Wilson
2011-03-18 15:10 ` Keith Packard
2011-03-18 16:27 ` Jesse Barnes
2011-03-18 8:02 ` [PATCH 5/8] drm/i915: Prevent racy removal of request from client list Chris Wilson
2011-03-18 8:02 ` [PATCH 6/8] drm: Fix use-after-free in drm_gem_vm_close() Chris Wilson
2011-03-18 15:15 ` [Intel-gfx] " Keith Packard
2011-03-18 8:02 ` [PATCH 7/8] drm/i915: Re-enable self-refresh Chris Wilson
2011-03-18 15:22 ` Keith Packard [this message]
2011-03-18 17:48 ` Chris Wilson
2011-03-18 18:12 ` Eric Anholt
2011-03-18 19:08 ` Chris Wilson
2011-03-18 8:02 ` [PATCH 8/8] drm/i915: Fix tiling corruption from pipelined fencing Chris Wilson
2011-03-19 22:17 ` Daniel Vetter
2011-03-19 22:25 ` Chris Wilson
2011-03-19 23:12 ` Daniel Vetter
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