Re: [PATCH v9 01/14] ASoC: sun4i-i2s: Change set_chan_cfg() params

[Clément Péron]

Hi Samuel

On Fri, 30 Oct 2020 at 02:20, Samuel Holland <samuel@xxxxxxxxxxxx> 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@xxxxxxxxxxxxxxx> 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
> >
>