[PATCH] sound/soc/davinci: fix error case in mcasp_set_ctl_reg

[PATCH] sound/soc/davinci: fix error case in mcasp_set_ctl_reg

[Pavel Machek]

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.

Signed-off-by: Pavel Machek <pavel@denx.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++) {
 		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");
 }
 
 static bool mcasp_is_synchronous(struct davinci_mcasp *mcasp)


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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: [PATCH] sound/soc/davinci: fix error case in mcasp_set_ctl_reg

[Peter Ujfalusi]

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@denx.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)
> 
> 

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