linux-kernel - Re: [PATCH 3/3] mfd: arizona: Use new regmap features for manual register patch

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Message-ID: <20140224161042.GF15847@lee--X1>
Date:	Mon, 24 Feb 2014 16:10:42 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	broonie@...nel.org, gregkh@...uxfoundation.org,
	sameo@...ux.intel.com, linux-kernel@...r.kernel.org,
	patches@...nsource.wolfsonmicro.com
Subject: Re: [PATCH 3/3] mfd: arizona: Use new regmap features for manual
 register patch

> On the wm5102 the register patches are applied manually, rather than by
> the regmap core. This application is wrapped in calls to
> regcache_cache_bypass. However, this is dangerous as other threads may
> be accessing the hardware at the same time as the pm_runtime operations
> and if they do so during the period whilst cache_bypass is enabled those
> writes will miss the cache when they shouldn't.
> 
> Apply the register patch using the new regmap_apply_patch function to
> avoid this problem. Also remove the call to regcache_cache_bypass from
> the hardware patch application as it is unneeded there and creates a
> similar window for writes to miss the cache.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> ---
>  drivers/mfd/arizona-core.c  |    4 ----
>  drivers/mfd/wm5102-tables.c |   19 ++-----------------
>  2 files changed, 2 insertions(+), 21 deletions(-)

Applied, thanks.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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