linux-kernel - Re: [PATCH] sound: pci: cmipci.c: Cleaning up function that are not used anywhere

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Date:	Wed, 03 Dec 2014 07:55:18 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	Jaroslav Kysela <perex@...ex.cz>,
	Benoit Taine <benoit.taine@...6.fr>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sound: pci: cmipci.c:  Cleaning up function that are not used anywhere

At Wed,  3 Dec 2014 00:12:55 +0100,
Rickard Strandqvist wrote:
> 
> Remove function snd_cmipci_pll_rmn() that is not used anywhere.

It's an experimental code that is currently disabled.  Keeping such a
code would be still meaningful if anyone wants to start a similar
experiment again.


Takashi

> This was partially found by using a static code analysis program called cppcheck.
> 
> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
> ---
>  sound/pci/cmipci.c |   41 -----------------------------------------
>  1 file changed, 41 deletions(-)
> 
> diff --git a/sound/pci/cmipci.c b/sound/pci/cmipci.c
> index 85ed403..e33edae 100644
> --- a/sound/pci/cmipci.c
> +++ b/sound/pci/cmipci.c
> @@ -615,47 +615,6 @@ static unsigned int snd_cmipci_rate_freq(unsigned int rate)
>  
>  #ifdef USE_VAR48KRATE
>  /*
> - * Determine PLL values for frequency setup, maybe the CMI8338 (CMI8738???)
> - * does it this way .. maybe not.  Never get any information from C-Media about
> - * that <werner@...e.de>.
> - */
> -static int snd_cmipci_pll_rmn(unsigned int rate, unsigned int adcmult, int *r, int *m, int *n)
> -{
> -	unsigned int delta, tolerance;
> -	int xm, xn, xr;
> -
> -	for (*r = 0; rate < CM_MAXIMUM_RATE/adcmult; *r += (1<<5))
> -		rate <<= 1;
> -	*n = -1;
> -	if (*r > 0xff)
> -		goto out;
> -	tolerance = rate*CM_TOLERANCE_RATE;
> -
> -	for (xn = (1+2); xn < (0x1f+2); xn++) {
> -		for (xm = (1+2); xm < (0xff+2); xm++) {
> -			xr = ((CM_REFFREQ_XIN/adcmult) * xm) / xn;
> -
> -			if (xr < rate)
> -				delta = rate - xr;
> -			else
> -				delta = xr - rate;
> -
> -			/*
> -			 * If we found one, remember this,
> -			 * and try to find a closer one
> -			 */
> -			if (delta < tolerance) {
> -				tolerance = delta;
> -				*m = xm - 2;
> -				*n = xn - 2;
> -			}
> -		}
> -	}
> -out:
> -	return (*n > -1);
> -}
> -
> -/*
>   * Program pll register bits, I assume that the 8 registers 0xf8 up to 0xff
>   * are mapped onto the 8 ADC/DAC sampling frequency which can be chosen
>   * at the register CM_REG_FUNCTRL1 (0x04).
> -- 
> 1.7.10.4
> 
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