linux-kernel - Re: [PATCH 2/4] ASoC: wm8940: Rewrite code to set proper clocks

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Message-ID: <20221214221035.25347427@wsk>
Date:   Wed, 14 Dec 2022 22:10:35 +0100
From:   Lukasz Majewski <lukma@...x.de>
To:     Mark Brown <broonie@...nel.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Stephen Kitt <steve@....org>, patches@...nsource.cirrus.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] ASoC: wm8940: Rewrite code to set proper clocks

Hi Mark,

> On Wed, Dec 14, 2022 at 01:37:41PM +0100, Lukasz Majewski wrote:
> 
> > Without this change, the wm8940 driver is not working when
> > set_sysclk callback (wm8940_set_dai_sysclk) is called with
> > frequency not listed in the switch clause.  
> 
> Your commit log doesn't actually describe what this change is...
> 
> > This change adjusts this driver to allow non-standard frequency
> > set (just after the boot) being adjusted afterwards by the sound
> > system core code.  
> 
> This doesn't appear to correspond to the commit.  The change will
> result in the driver automatically configuring it's PLL.
> 

Yes, indeed - I will update the description.

The problem with the old code was that after boot up - the frequency
was not in the 'switch' values, so the driver aborted in early init.

> > Code in this commit is based on previous change done for wm8974
> > (SHA1: 51b2bb3f2568e6d9d81a001d38b8d70c2ba4af99).  
> 
> Please include human readable descriptions of things like commits and
> issues being discussed in e-mail in your mails, this makes them much
> easier for humans to read especially when they have no internet
> access. I do frequently catch up on my mail on flights or while
> otherwise travelling so this is even more pressing for me than just
> being about making things a bit easier to read.

Ok. I will provide proper description.

> 
> > @@ -496,7 +505,6 @@ static int wm8940_set_bias_level(struct
> > snd_soc_component *component, return ret;
> >  			}
> >  		}
> > -
> >  		/* ensure bufioen and biasen */
> >  		pwr_reg |= (1 << 2) | (1 << 3);
> >  		/* set vmid to 300k for standby */  
> 
> Unrelated (and questionable) whitespace change.

Ok. I will remove it.

Thanks for the review.


Best regards,

Lukasz Majewski

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