linux-kernel - Re: [linux-sunxi] [PATCH 02/16] ASoC: sun4i-i2s: Adjust LRCLK width

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Date:   Fri, 10 Jul 2020 00:44:38 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     peron.clem@...il.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>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Marcus Cooper <codekipper@...il.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com, Maxime Ripard <maxime@...no.tech>
Subject: Re: [linux-sunxi] [PATCH 02/16] ASoC: sun4i-i2s: Adjust LRCLK width

On 7/4/20 6:38 AM, Clément Péron wrote:
> From: Marcus Cooper <codekipper@...il.com>
> 
> Some codecs such as i2s based HDMI audio and the Pine64 DAC require
> a different amount of bit clocks per frame than what is calculated
> by the sample width. Use the values obtained by the tdm slot bindings
> to adjust the LRCLK width accordingly.
> 
> Signed-off-by: Marcus Cooper <codekipper@...il.com>
> Signed-off-by: Clément Péron <peron.clem@...il.com>
> Acked-by: Maxime Ripard <maxime@...no.tech>
> ---
>  sound/soc/sunxi/sun4i-i2s.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
> index 9690389cb68e..8bae97efea30 100644
> --- a/sound/soc/sunxi/sun4i-i2s.c
> +++ b/sound/soc/sunxi/sun4i-i2s.c
> @@ -470,6 +470,9 @@ static int sun8i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s,
>  		return -EINVAL;
>  	}
>  
> +	if (i2s->slot_width)
> +		lrck_period = i2s->slot_width;
> +
>  	regmap_update_bits(i2s->regmap, SUN4I_I2S_FMT0_REG,
>  			   SUN8I_I2S_FMT0_LRCK_PERIOD_MASK,
>  			   SUN8I_I2S_FMT0_LRCK_PERIOD(lrck_period));
> 

It looks like the existing code would have the same problem, that this should be
lrck_period - 1 according to the manual (I checked H3).

Regards,
Samuel