linux-kernel - Re: [PATCH v1] sound: riptide: Remove duplicate judgments code

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Message-ID: <878rbw2fb4.wl-tiwai@suse.de>
Date:   Tue, 04 Jul 2023 11:31:43 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Minjie Du <duminjie@...o.com>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        alsa-devel@...a-project.org (moderated list:SOUND),
        linux-kernel@...r.kernel.org (open list),
        opensource.kernel@...o.com
Subject: Re: [PATCH v1] sound: riptide: Remove duplicate judgments code

On Tue, 04 Jul 2023 11:11:31 +0200,
Minjie Du wrote:
> 
> Fix: delate duplicate judgments
> Could you help check it out? Thank you!

I'm afraid that it's no right fix.
The duplicated calls actually send two commands sequentially, and if
you drop one, it'll change the behavior completely.

Honestly speaking, I have no idea whether sending twice is mandatory
for this chip.  It's an ugly driver by reverse engineering, so who
knows.  We can get rid of it in future.  But it's a different topic.


thanks,

Takashi

> 
> Signed-off-by: Minjie Du <duminjie@...o.com>
> ---
>  sound/pci/riptide/riptide.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
> 
> diff --git a/sound/pci/riptide/riptide.c b/sound/pci/riptide/riptide.c
> index b37c877c2..9bf4b2e86 100644
> --- a/sound/pci/riptide/riptide.c
> +++ b/sound/pci/riptide/riptide.c
> @@ -958,8 +958,7 @@ getsourcesink(struct cmdif *cif, unsigned char source, unsigned char sink,
>  {
>  	union cmdret rptr = CMDRET_ZERO;
>  
> -	if (SEND_RSSV(cif, source, sink, &rptr) &&
> -	    SEND_RSSV(cif, source, sink, &rptr))
> +	if (SEND_RSSV(cif, source, sink, &rptr))
>  		return -EIO;
>  	*a = rptr.retbytes[0];
>  	*b = rptr.retbytes[1];
> @@ -978,8 +977,7 @@ getsamplerate(struct cmdif *cif, unsigned char *intdec, unsigned int *rate)
>  	s = intdec;
>  	for (i = 0; i < 2; i++) {
>  		if (*s != 0xff) {
> -			if (SEND_RSRC(cif, *s, &rptr) &&
> -			    SEND_RSRC(cif, *s, &rptr))
> +			if (SEND_RSRC(cif, *s, &rptr))
>  				return -EIO;
>  			p[i] += rptr.retwords[1];
>  			p[i] *= rptr.retwords[2];
> @@ -1013,8 +1011,7 @@ setsampleformat(struct cmdif *cif,
>  	sig = snd_pcm_format_unsigned(format) != 0;
>  	order = snd_pcm_format_big_endian(format) != 0;
>  
> -	if (SEND_SETF(cif, mixer, w, ch, order, sig, id) &&
> -	    SEND_SETF(cif, mixer, w, ch, order, sig, id)) {
> +	if (SEND_SETF(cif, mixer, w, ch, order, sig, id)) {
>  		snd_printdd("setsampleformat failed\n");
>  		return -EIO;
>  	}
> @@ -1060,7 +1057,7 @@ getmixer(struct cmdif *cif, short num, unsigned short *rval,
>  {
>  	union cmdret rptr = CMDRET_ZERO;
>  
> -	if (SEND_RDGV(cif, num, num, &rptr) && SEND_RDGV(cif, num, num, &rptr))
> +	if (SEND_RDGV(cif, num, num, &rptr))
>  		return -EIO;
>  	*rval = rptr.retwords[0];
>  	*lval = rptr.retwords[1];
> -- 
> 2.39.0
>