linux-kernel - Re: [PATCH v3 14/17] ASoC: fsl_ssi: Clean up _fsl_ssi_set_dai

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Message-ID: <88551d87-1b76-9a30-6781-1d0b6479b317@maciej.szmigiero.name>
Date:   Mon, 15 Jan 2018 22:16:28 +0100
From:   "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     timur@...i.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, alsa-devel@...a-project.org,
        lgirdwood@...il.com, fabio.estevam@....com, caleb@...me.org,
        arnaud.mouiche@...oxia.com, lukma@...x.de, kernel@...gutronix.de
Subject: Re: [PATCH v3 14/17] ASoC: fsl_ssi: Clean up _fsl_ssi_set_dai_fmt()

On 15.01.2018 05:21, Nicolin Chen wrote:
> The _fsl_ssi_set_dai_fmt() is a helper function being called from
> fsl_ssi_set_dai_fmt() as an ASoC operation and fsl_ssi_hw_init()
> mainly for AC97 format initialization.
> 
> This patch cleans the _fsl_ssi_set_dai_fmt() in following ways:
> * Removing *dev pointer in the parameters as it's included in the
>   *ssi pointer of struct fsl_ssi.
> * Using regmap_update_bits() instead of regmap_read() with masking
>   the value manually.
> * Removing TXBIT0 configurations since this bit is set to 1 as its
>   reset value and there is no use case so far to unset it. And it
>   is safe to remove since regmap_update_bits() won't touch it.

I didn't get any response to a comment I've written about the point
above during the previous patch iteration:> The old code set this bit in any mode other than AC'97 (where the
> hardware always treats this bit as set regardless of the actual value).
> I would play safe here and not rely on this bit being set by a SSI
> reset on all SSI models.

Maciej

> * Moving baudclk check to the switch-case routine to skip the I2S
>   master check. And moving SxCCR.DC settings after baudclk check.
> * Adding format settings for SND_SOC_DAIFMT_AC97 like others.
> 
> Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
> Tested-by: Caleb Crome <caleb@...me.org>
> ---
> Changelog
> v3
>  * Put CBM_CFS behind the baudclk check to keep the same program
>    flow as before
> 
>  sound/soc/fsl/fsl_ssi.c | 73 ++++++++++++++++++++++---------------------------
>  1 file changed, 33 insertions(+), 40 deletions(-)
>