linux-kernel - Re: [PATCH] i2c/tegra: I2C driver uses the suspend_noirq/resume

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Date:	Thu, 22 Sep 2011 18:01:54 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Stephen Warren <swarren@...dia.com>
Cc:	Ben Dooks <ben-linux@...ff.org>, Dilan Lee <dilee@...dia.com>,
	linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c/tegra: I2C driver uses the
 suspend_noirq/resume_noirq

On Fri, Aug 05, 2011 at 05:15:02PM -0600, Stephen Warren wrote:
> From: Dilan Lee <dilee@...dia.com>
> 
> We found the register settings of wm8903(an audio codec) can't be modified
> in snd_soc_suspend since I2C bus has been suspended before snd_soc_suspend.
> 
> Pop noise will occur when system resume from LP0 if the register settings of wm8903
> haven't be modified correctly in snd_soc_suspend.
> 
> So, we use the suspend_noirq/resume_noirq callbacks to make sure I2C bus still
> operates while running snd_soc_suspend.
> 
> Signed-off-by: Dilan Lee <dilee@...dia.com>
> Signed-off-by: Stephen Warren <swarren@...dia.com>

At Stephen's request

Reviewed-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
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