linux-kernel - Re: [PATCH v1] ASoC: starfive: Cleanup and fix error check for JH7110 TDM

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Date:   Thu, 8 Jun 2023 18:43:09 +0800
From:   Walker Chen <walker.chen@...rfivetech.com>
To:     Mark Brown <broonie@...nel.org>
CC:     Claudiu Beznea <Claudiu.Beznea@...rochip.com>,
        Dan Carpenter <dan.carpenter@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Takashi Iwai <tiwai@...e.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] ASoC: starfive: Cleanup and fix error check for JH7110
 TDM



On 2023/6/8 18:15, Mark Brown wrote:
> On Thu, Jun 08, 2023 at 10:15:03AM +0800, Walker Chen wrote:
>> On 2023/6/7 19:44, Mark Brown wrote:
> 
>> >> -		  (tdm->rx.wl << WL_BIT) |
>> >> -		  (tdm->rx.sscale << SSCALE_BIT) |
>> >> -		  (tdm->rx.sl << SL_BIT) |
>> >> -		  (tdm->rx.lrj << LRJ_BIT);
>> >> +	datarx = (tdm->rxwl << 8) |
>> >> +		  (tdm->rxsscale << 4) |
>> >> +		  (tdm->rxsl << 2) |
>> >> +		  TDM_PCMRXCR_LEFT_J;
> 
>> > I'm not sure this change to use numbers here is a win - the _BIT
>> > definitions look fine (I might've called them _SHIFT but whatever).
> 
>> This is Claudiu's advice. Using the macro BIT() to replace these definition of *_BIT, 
>> it will result in big changes in the code.
> 
> I'm questioning doing a change at all.
> 
>> Please refer to previous comments:
>>  https://lore.kernel.org/all/143e2fa2-e85d-8036-4f74-ca250c026c1b@microchip.com/
> 
> I can't find the comments you're referring to in there.

You should see the following comments in the link above:

> +       #define CLKPOL_BIT              5
> +       #define TRITXEN_BIT             4
> +       #define ELM_BIT                 3
> +       #define SYNCM_BIT               2
> +       #define MS_BIT                  1

Instead of these *_BIT defines as plain numbers you can defined them using
BIT() macro and use macros in place instead of