linux-kernel - Re: [PATCH 00/21] ASoC: sun4i-i2s: Number of fixes and TDM Support

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Date:   Tue, 27 Aug 2019 11:35:36 +0200
From:   Maxime Ripard <mripard@...nel.org>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Code Kipper <codekipper@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/21] ASoC: sun4i-i2s: Number of fixes and TDM Support

Hi,

On Tue, Aug 27, 2019 at 04:20:24PM +0800, Chen-Yu Tsai wrote:
> Hi everyone,
>
> On Tue, Aug 20, 2019 at 3:25 AM Maxime Ripard <mripard@...nel.org> wrote:
> >
> > From: Maxime Ripard <maxime.ripard@...tlin.com>
> >
> > Hi,
> >
> > This series aims at fixing a number of issues in the current i2s driver,
> > mostly related to the i2s master support and the A83t support. It also uses
> > that occasion to cleanup a few things and simplify the driver. Finally, it
> > builds on those fixes and cleanups to introduce TDM and DSP formats support.
> >
> > Let me know what you think,
> > Maxime
> >
> > Marcus Cooper (1):
> >   ASoC: sun4i-i2s: Fix the MCLK and BCLK dividers on newer SoCs
> >
> > Maxime Ripard (20):
> >   ASoC: sun4i-i2s: Register regmap and PCM before our component
> >   ASoC: sun4i-i2s: Switch to devm for PCM register
> >   ASoC: sun4i-i2s: Replace call to params_channels by local variable
> >   ASoC: sun4i-i2s: Move the channel configuration to a callback
> >   ASoC: sun4i-i2s: Move the format configuration to a callback
> >   ASoC: sun4i-i2s: Rework MCLK divider calculation
> >   ASoC: sun4i-i2s: Don't use the oversample to calculate BCLK
> >   ASoC: sun4i-i2s: Use module clock as BCLK parent on newer SoCs
> >   ASoC: sun4i-i2s: RX and TX counter registers are swapped
> >   ASoC: sun4i-i2s: Use the actual format width instead of an hardcoded one
> >   ASoC: sun4i-i2s: Fix LRCK and BCLK polarity offsets on newer SoCs
> >   ASoC: sun4i-i2s: Fix the LRCK polarity
> >   ASoC: sun4i-i2s: Fix WSS and SR fields for the A83t
> >   ASoC: sun4i-i2s: Fix MCLK Enable bit offset on A83t
> >   ASoC: sun4i-i2s: Fix the LRCK period on A83t
> >   ASoC: sun4i-i2s: Remove duplicated quirks structure
>
> Unfortunately the patches that "fix" support on the A83T actually break it.
> The confusion stems from the user manual not actually documenting the I2S
> controller. Instead it documents the TDM controller, which is very similar
> or the same as the I2S controller in the H3. The I2S controller that we
> actually support in this driver is not the TDM controller, but three other
> I2S controllers that are only mentioned in the memory map. Support for this
> was done by referencing the BSP kernel, which has separate driver instances
> for each controller instance, both I2S and TDM.
>
> Now to remedy this I could send reverts for all the "A83t" patches, and
> fixes for all the others that affect the A83t quirks. However the fixes
> tags existing in the tree would be wrong and confusing. That might be a
> pain for the stable kernel maintainers.
>
> Any suggestions on how to proceed?

I've just sent two patches to address that (adding a comment in the
process so that hopefully it doesn't happen again).

Let me know if it works, and sorry for the mess :/
Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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