linux-kernel - Re: [PATCH 2/2] ASoC: codecs: ad193x: Reset DAC Control 1 register at probe

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Date:   Wed, 26 Jun 2019 12:16:35 +0000
From:   <Codrin.Ciubotariu@...rochip.com>
To:     <broonie@...nel.org>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <lars@...afoo.de>, <lgirdwood@...il.com>, <perex@...ex.cz>,
        <tiwai@...e.com>
Subject: Re: [PATCH 2/2] ASoC: codecs: ad193x: Reset DAC Control 1 register at
 probe

On 26.06.2019 14:23, Mark Brown wrote:
> On Wed, Jun 26, 2019 at 01:49:47PM +0300, Codrin Ciubotariu wrote:
>> Since the ad193x codecs have no software reset, we have to reinitialize the
>> registers after a hardware reset. For example, if we change the
>> device-tree between these resets, changing the audio format of the DAI link
>> from DSP_A with 8 TDM channels to I2S 2 channels, DAC Control 1 register
>> will remain configured for 8 channels. This patch resets this register at
>> probe to its default value.
> 
> Would it not be more robust/complete to have a set of register defaults
> and write the whole lot out rather than individually going through and
> adding writes for specific registers as needed?
> 

It would indeed. I will make two patches, one that implements what you 
suggested, for the registers that we touch only, and another one that 
will add AD193X_DAC_CTRL1 to these defaults. You can drop this patch.

Thanks and best regards,
Codrin