linux-kernel - Re: [PATCH v7 01/14] ASoC: sun4i-i2s: Change set_chan

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Message-ID: <20201012135845.s6tknsnjrtsuoacf@gilmour.lan>
Date:   Mon, 12 Oct 2020 15:58:45 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        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, Samuel Holland <samuel@...lland.org>
Subject: Re: [PATCH v7 01/14] ASoC: sun4i-i2s: Change set_chan_cfg() params

On Sun, Oct 11, 2020 at 10:22:11PM +0200, Clément Péron wrote:
> As slots and slot_width can be set manually using set_tdm().
> These values are then kept in sun4i_i2s struct.
> So we need to check if these values are set or not.
> 
> This is not done actually and will trigger a bug.
> For example, if we set to the simple soundcard in the device-tree
> dai-tdm-slot-width = <32> and then start a stream using S16_LE,
> currently we would calculate BCLK for 32-bit slots, but program
> lrck_period for 16-bit slots, making the sample rate double what we
> expected.
> 
> To fix this, we need to check if these values are set or not but as
> this logic is already done by the caller. Avoid duplicating this
> logic and just pass the required values as params to set_chan_cfg().
> 
> Suggested-by: Samuel Holland <samuel@...lland.org>
> Signed-off-by: Clément Péron <peron.clem@...il.com>

We still have an ongoing discussion on this one in the v6

Maxime

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