linux-kernel - Re: [PATCH 1/1] ASoC: sunxi: sun4i-i2s: fix LRCLK polarity in i2s mode

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Date: Fri, 07 Jun 2024 10:04:43 +0200
From: Matteo Martelli <matteomartelli3@...il.com>
To: Maxime Ripard <mripard@...nel.org>, 
 Matteo Martelli <matteomartelli3@...il.com>
Cc: Liam Girdwood <lgirdwood@...il.com>, 
 Mark Brown <broonie@...nel.org>, 
 Jaroslav Kysela <perex@...ex.cz>, 
 Takashi Iwai <tiwai@...e.com>, 
 Chen-Yu Tsai <wens@...e.org>, 
 Jernej Skrabec <jernej.skrabec@...il.com>, 
 Samuel Holland <samuel@...lland.org>, 
 Marcus Cooper <codekipper@...il.com>, 
 Clément Péron <peron.clem@...il.com>, 
 linux-sound@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, 
 linux-sunxi@...ts.linux.dev, 
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ASoC: sunxi: sun4i-i2s: fix LRCLK polarity in i2s
 mode

Maxime Ripard wrote:
> > -	/*
> > -	 * DAI clock polarity
> > -	 *
> > -	 * The setup for LRCK contradicts the datasheet, but under a
> > -	 * scope it's clear that the LRCK polarity is reversed
> > -	 * compared to the expected polarity on the bus.
> > -	 */
> 
> I think we should keep that comment somewhere.

I think that keeping that comment would be very misleading since the LRCLK
setup would not contradict the datasheet anymore [1][2].

Also, do you recall any details about the mentioned scope test setup? Was i2s
mode tested in that occasion? It would help clarify the situation.

Could anyone verify this patch against H3/H6 SoCs?

[1]: https://linux-sunxi.org/images/4/4b/Allwinner_H3_Datasheet_V1.2.pdf
section 8.6.7.2
[2]: https://linux-sunxi.org/images/4/46/Allwinner_H6_V200_User_Manual_V1.1.pdf
section 7.2.5.2

Thanks,
Matteo Martelli