linux-kernel - Re: [PATCH 2/2] ASoC: tlv320adcx140: Wake up codec before accessing register

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Message-ID: <89f8cce0-2407-15f5-a8e5-0aa17a2eb2c4@ti.com>
Date:   Tue, 8 Sep 2020 06:49:25 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Camel Guo <camel.guo@...s.com>, <lgirdwood@...il.com>,
        <broonie@...nel.org>, <tiwai@...e.com>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...s.com>, Camel Guo <camelg@...s.com>
Subject: Re: [PATCH 2/2] ASoC: tlv320adcx140: Wake up codec before accessing
 register

Camel

On 9/8/20 3:35 AM, Camel Guo wrote:
> From: Camel Guo <camelg@...s.com>
>
> According to its datasheet, after reset this codec goes into sleep
> mode. In this mode, any register accessing should be avoided except for
> exiting sleep mode. Hence this commit moves SLEEP_CFG access before any
> register accessing.

This is interesting because our HW team suggested putting the device 
into sleep mode when doing register writes/reads because they were 
finding abnormalities in the register settings when the device is active.

I have a local patch that changes this as well that the HW team requested.

Mark

Let me run this by the HW team first before applying this patch.

Dan