linux-kernel - RE: [PATCH 6/7] ASoC: renesas: rz-ssi: Add support for 24 bits sample width

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Message-ID:
 <TY3PR01MB11346913CA80804E4EFFB670586CDA@TY3PR01MB11346.jpnprd01.prod.outlook.com>
Date: Thu, 13 Nov 2025 08:04:05 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>, biju.das.au
	<biju.das.au@...il.com>
CC: Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>, Liam
 Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, Jaroslav
 Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
	"linux-sound@...r.kernel.org" <linux-sound@...r.kernel.org>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Geert
 Uytterhoeven <geert+renesas@...der.be>
Subject: RE: [PATCH 6/7] ASoC: renesas: rz-ssi: Add support for 24 bits sample
 width

Hi Morimoto-san,

Thanks for the feedback.

> -----Original Message-----
> From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
> Sent: 13 November 2025 05:56
> Subject: Re: [PATCH 6/7] ASoC: renesas: rz-ssi: Add support for 24 bits sample width
> 
> 
> Hi
> 
> > From: Biju Das <biju.das.jz@...renesas.com>
> >
> > Add support for 24 bits sample format width for RZ/G2L SoCs.
> >
> > Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> > ---
> (snip)
> >  	ssicr |= SSICR_CKDV(clk_ckdv);
> > -	ssicr |= SSICR_DWL(1) | SSICR_SWL(3);
> > +	switch (ssi->hw_params_cache.sample_width) {
> > +	case 16:
> > +		ssicr |= SSICR_DWL(1);
> > +		break;
> > +	case 24:
> > +		ssicr |= SSICR_PDTA;
> > +		ssicr |= SSICR_DWL(5);
> 
> nitpick
> It can be 1 line ?

Agreed.

> 
> > @@ -662,8 +697,13 @@ static int rz_ssi_dma_slave_config(struct rz_ssi_priv *ssi,
> >  	cfg.direction = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
> >  	cfg.dst_addr = ssi->phys + SSIFTDR;
> >  	cfg.src_addr = ssi->phys + SSIFRDR;
> > -	cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
> > -	cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
> > +	if (ssi->hw_params_cache.sample_width == 24) {
> > +		cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
> > +		cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
> > +	} else {
> > +		cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
> > +		cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
> > +	}
> 
> You can reduce extra if check when 32 case ([7/7]) if it was
> 
> 	if (xxx == 16) {
> 		...
> 	} else { // for 24, 32
> 		...
> 	}

OK, will fix this in next version.

Cheers,
Biju