linux-kernel - Re: [PATCH v9 01/14] ASoC: sun4i-i2s: Change set_chan

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAJiuCceqhGjzJV+=KQkzswpiG2QRb3NhVHqmrXHBi50wNZBFXw@mail.gmail.com>
Date:   Fri, 30 Oct 2020 13:58:07 +0100
From:   Clément Péron <peron.clem@...il.com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        devicetree <devicetree@...r.kernel.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        Marcus Cooper <codekipper@...il.com>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v9 01/14] ASoC: sun4i-i2s: Change set_chan_cfg() params

Hi Samuel

On Fri, 30 Oct 2020 at 02:20, Samuel Holland <samuel@...lland.org> wrote:
>
> On 10/27/20 4:43 PM, Clément Péron wrote:
> > Hi Pierre-Louis,
> >
> > On Tue, 27 Oct 2020 at 19:59, Pierre-Louis Bossart
> > <pierre-louis.bossart@...ux.intel.com> wrote:
> >>
> >>
> >>> @@ -452,11 +454,11 @@ static int sun8i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s,
> >>>       case SND_SOC_DAIFMT_DSP_B:
> >>>       case SND_SOC_DAIFMT_LEFT_J:
> >>>       case SND_SOC_DAIFMT_RIGHT_J:
> >>> -             lrck_period = params_physical_width(params) * slots;
> >>> +             lrck_period = slot_width * slots;
> >>>               break;
> >>>
> >>>       case SND_SOC_DAIFMT_I2S:
> >>> -             lrck_period = params_physical_width(params);
> >>> +             lrck_period = slot_width;
> >>>               break;
> >>
> >> Aren't I2S, LEFT_J and RIGHT_J pretty much the same in terms of lrclk
> >> rate/period? the only thing that can change is the polarity, no?
> >>
> >> Not sure why it's handled differently here?
> >
> > I just had a look at the User Manual for H3 and H6 and I didn't find
> > any reason why LEFT_J and RIGHT_J should be computed in a different
> > way as I2S.
>
> Yes, and the manual explicitly groups LEFT_J and RIGHT_J with I2S when
> describing this field:
>
>    PCM Mode: Number of BCLKs within (Left + Right) channel width.
>    I2S/Left-Justified/Right-Justified Mode: Number of BCLKs within each
> individual channel width(Left or Right)
>
> So I agree that the code is wrong here.

Thanks, I will send a fix in the v10.

Regards,
Clement

>
> Regards,
> Samuel
>
> > Also the commit introducing this doesn't mention it.
> > 7ae7834ec446 ("ASoC: sun4i-i2s: Add support for DSP formats")
> >
> > I can't test it with my board but if nobody complains about it, I will
> > introduce a fix for this in the next version and change this also for
> > H6.
> >
> > Thanks for your review,
> > Clement
> >
>