linux-kernel - Re: [PATCH] ASoC: tlv320aic32x4: Kernel OOPS while entering DAPM standby mode

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Date:   Fri, 4 Jan 2019 01:04:21 +0530
From:   b-ak <anur.bhargav@...il.com>
To:     Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: tlv320aic32x4: Kernel OOPS while entering DAPM
 standby mode

On Thu, Jan 03, 2019 at 12:45:54PM +0000, Mark Brown wrote:
> On Wed, Jan 02, 2019 at 10:36:33PM +0530, b-ak wrote:
> > During the bootup of the kernel, as soon as the DAPM framework kicks in
> > it pushes the codec into standy mode.
> > 
> > The existing TVL320AIC32x4 codec driver doesn't prepare the clock in
> > the probe function.
> > This leads to an OOPS when the DAPM tries to put it into standy by calling
> > clk_disable_unprepare()
> > 
> > This patch fixes that problem.
> 
> This isn't the best way of fixing this because it makes it look like
> there's a missing disable in the removal process.  What would be better
> would be to do what other drivers do and check to see what state we're
> transitioning from before we disable the clock in set_bias_level().  See
> drivers like wm8903.c for examples.

Hello Mark,

I will test the change and update the patch.

Thanks,
Bhargav