linux-kernel - Re: [PATCH] ASoC: sunxi: sun4i-i2s: Enable 32-bit audio formats

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Message-ID: <ZgWFGHvjjGkRVubV@titan>
Date: Fri, 29 Mar 2024 01:56:24 +1100
From: John Watts <contact@...kia.org>
To: Mark Brown <broonie@...nel.org>
Cc: Jernej Škrabec <jernej.skrabec@...il.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
	Chen-Yu Tsai <wens@...e.org>, Samuel Holland <samuel@...lland.org>,
	linux-sound@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: sunxi: sun4i-i2s: Enable 32-bit audio formats

On Thu, Mar 28, 2024 at 01:56:42PM +0000, Mark Brown wrote:
> On Thu, Mar 28, 2024 at 01:21:21PM +1100, John Watts wrote:
> > On Wed, Mar 27, 2024 at 08:53:32PM +0100, Jernej Škrabec wrote:
> 
> > > I wish it would be that simple. SUN4I_FORMATS is cross section of all I2S
> > > variants that are supported by this driver. If you check A10, you'll see that
> > > it doesn't support S32.
> 
> > > If you want to add support for S32, you'll have to add new quirk for each
> > > variant.
> 
> > Yes, A10 doesn't support it. But it should error out in hw_params due to
> > get_sr not supporting 32-bit, no?
> 
> The constraints shouldn't be advertising things that hw_params() will
> error out on, sometimes there are contingent constraints that prevent
> this but something that just doesn't work isn't one of those times.

Oh right! I'm not sure how I forgot about this, given I went through this
exact discussion for my wm8782 patch.

I'll try and get v2 patch for this soon. :)

John.