linux-kernel - Re: [PATCH] sound/soc/davinci: fix error case in mcasp_set_ctl

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Date:	Tue, 17 Nov 2015 09:40:31 +0200
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Pavel Machek <pavel@....cz>, <linux-kernel@...r.kernel.org>,
	<alsa-devel@...a-project.org>, <misael.lopez@...com>,
	<jsarha@...com>, <tiwai@...e.com>, <perex@...ex.cz>,
	<broonie@...nel.org>, <lgirdwood@...il.com>
Subject: Re: [PATCH] sound/soc/davinci: fix error case in mcasp_set_ctl_reg

On 11/16/2015 07:40 PM, Pavel Machek wrote:
> 
> This fixes typo in comment and fixes mcasp_set_ctl_reg to actually
> printk on error as author wanted, and cleans it up. Yes, i will end up
> being 1001 in the old code.

Yeah, the original code had the additional GBLCTL register check after the
timeout. Which was pointless IMHO.
I'm fine with the change, but...

> 
> Signed-off-by: Pavel Machek <pavel@...x.de>
> 
> diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
> index b960e62..a739ca8 100644
> --- a/sound/soc/davinci/davinci-mcasp.c
> +++ b/sound/soc/davinci/davinci-mcasp.c
> @@ -148,15 +150,14 @@ static void mcasp_set_ctl_reg(struct davinci_mcasp *mcasp, u32 ctl_reg, u32 val)
>  
>  	mcasp_set_bits(mcasp, ctl_reg, val);
>  
> -	/* programming GBLCTL needs to read back from GBLCTL and verfiy */
> +	/* programming GBLCTL needs to read back from GBLCTL and verify */
>  	/* loop count is to avoid the lock-up */
> -	for (i = 0; i < 1000; i++) {
> +	for (i = 0; i <= 1000; i++) {

Does it really make any difference to change this from looping 1000 times to
1001 times?

>  		if ((mcasp_get_reg(mcasp, ctl_reg) & val) == val)
> -			break;
> +			return;
>  	}
>  
> -	if (i == 1000 && ((mcasp_get_reg(mcasp, ctl_reg) & val) != val))
> -		printk(KERN_ERR "GBLCTL write error\n");
> +	printk(KERN_ERR "GBLCTL write error\n");

Can you change this to dev_err(mcasp->dev, ...);

>  }
>  
>  static bool mcasp_is_synchronous(struct davinci_mcasp *mcasp)
> 
> 

-- 
Péter
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