linux-kernel - Re: [PATCH V3 1/2] ASoC: fsl_asrc: replace the process

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Date:   Thu, 18 Apr 2019 02:05:35 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     "S.j. Wang" <shengjiu.wang@....com>
Cc:     "timur@...nel.org" <timur@...nel.org>,
        "Xiubo.Lee@...il.com" <Xiubo.Lee@...il.com>,
        "festevam@...il.com" <festevam@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3 1/2] ASoC: fsl_asrc: replace the process_option table
 with function

On Thu, Apr 18, 2019 at 08:50:48AM +0000, S.j. Wang wrote:
> > And this is according to IMX6DQRM:
> >     Limited support for the case when output sampling rates is
> >     between 8kHz and 30kHz. The limitation is the supported ratio
> >     (Fsin/Fsout) range as between 1/24 to 8
> > 
> > This should cover your 8.125 condition already, even if having an outrate
> > range between [8KHz, 30KHz] check, since an outrate above 30KHz will not
> > have an inrate bigger than 8.125 times of it, given the maximum input rate
> > is 192KHz.
> > 
> > So I think that we can just drop that 8.125 condition from your change and
> > there's no need to error out any more.
> > 
> No, if outrate=8kHz,  inrate > 88.2kHz, these cases are not supported. 
> This is not covered by
> 
>         if ((outrate > 8000 && outrate < 30000) &&
>             (outrate/inrate > 24 || inrate/outrate > 8)) {

Good catch. The range should be [8KHz, 30KHz] vs. (8KHz, 32KHz)
in the code. Then I think the fix should be at both lines:

-         if ((outrate > 8000 && outrate < 30000) &&
-             (outrate/inrate > 24 || inrate/outrate > 8)) {
+         if ((outrate >= 8000 && outrate =< 30000) &&
+             (outrate > 24 * inrate || inrate > 8 * outrate)) {

Overall, I think we should fix this instead of adding an extra
one, since it is very likely saying the same thing.