linux-kernel - Re: [PATCH v2 2/5] ASoC: sun4i-spdif: Add support for H6 SoC

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Date:   Thu, 2 May 2019 10:25:26 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Takashi Iwai <tiwai@...e.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 2/5] ASoC: sun4i-spdif: Add support for H6 SoC

On Fri, Apr 19, 2019 at 09:17:27PM +0200, Clément Péron wrote:
> Allwinner H6 has a different mapping for the fifo register controller.
>
> Actually only the fifo tx flush bit is used.
>
> Add a new quirk to know the correct fifo tx flush bit.
>
> Signed-off-by: Clément Péron <peron.clem@...il.com>
> ---
>  sound/soc/sunxi/sun4i-spdif.c | 42 ++++++++++++++++++++++++++++++-----
>  1 file changed, 36 insertions(+), 6 deletions(-)
>
> diff --git a/sound/soc/sunxi/sun4i-spdif.c b/sound/soc/sunxi/sun4i-spdif.c
> index b4af4aabead1..19e4bf9caa24 100644
> --- a/sound/soc/sunxi/sun4i-spdif.c
> +++ b/sound/soc/sunxi/sun4i-spdif.c
> @@ -75,6 +75,18 @@
>  	#define SUN4I_SPDIF_FCTL_RXOM(v)		((v) << 0)
>  	#define SUN4I_SPDIF_FCTL_RXOM_MASK		GENMASK(1, 0)
>
> +#define SUN50I_H6_SPDIF_FCTL (0x14)
> +	#define SUN50I_H6_SPDIF_FCTL_HUB_EN		BIT(31)
> +	#define SUN50I_H6_SPDIF_FCTL_FTX		BIT(30)
> +	#define SUN50I_H6_SPDIF_FCTL_FRX		BIT(29)
> +	#define SUN50I_H6_SPDIF_FCTL_TXTL(v)		((v) << 12)
> +	#define SUN50I_H6_SPDIF_FCTL_TXTL_MASK		GENMASK(19, 12)
> +	#define SUN50I_H6_SPDIF_FCTL_RXTL(v)		((v) << 4)
> +	#define SUN50I_H6_SPDIF_FCTL_RXTL_MASK		GENMASK(10, 4)
> +	#define SUN50I_H6_SPDIF_FCTL_TXIM		BIT(2)
> +	#define SUN50I_H6_SPDIF_FCTL_RXOM(v)		((v) << 0)
> +	#define SUN50I_H6_SPDIF_FCTL_RXOM_MASK		GENMASK(1, 0)
> +
>  #define SUN4I_SPDIF_FSTA	(0x18)
>  	#define SUN4I_SPDIF_FSTA_TXE			BIT(14)
>  	#define SUN4I_SPDIF_FSTA_TXECNTSHT		(8)
> @@ -169,16 +181,25 @@ struct sun4i_spdif_dev {
>  	struct snd_soc_dai_driver cpu_dai_drv;
>  	struct regmap *regmap;
>  	struct snd_dmaengine_dai_dma_data dma_params_tx;
> +	const struct sun4i_spdif_quirks *quirks;

I guess this will generate a warning since the structure hasn't been
defined yet?

> +};
> +
> +struct sun4i_spdif_quirks {
> +	unsigned int reg_dac_txdata;	/* TX FIFO offset for DMA config */
> +	unsigned int reg_fctl_ftx;	/* TX FIFO flush bitmask */
> +	bool has_reset;

You don't really need to move it around, you can just add the
structure prototype.

If you do want to move it around, then please do so in a separate patch

>  };
>
>  static void sun4i_spdif_configure(struct sun4i_spdif_dev *host)
>  {
> +	const struct sun4i_spdif_quirks *quirks = host->quirks;
> +
>  	/* soft reset SPDIF */
>  	regmap_write(host->regmap, SUN4I_SPDIF_CTL, SUN4I_SPDIF_CTL_RESET);
>
>  	/* flush TX FIFO */
>  	regmap_update_bits(host->regmap, SUN4I_SPDIF_FCTL,
> -			   SUN4I_SPDIF_FCTL_FTX, SUN4I_SPDIF_FCTL_FTX);
> +			   quirks->reg_fctl_ftx, quirks->reg_fctl_ftx);
>
>  	/* clear TX counter */
>  	regmap_write(host->regmap, SUN4I_SPDIF_TXCNT, 0);
> @@ -405,22 +426,26 @@ static struct snd_soc_dai_driver sun4i_spdif_dai = {
>  	.name = "spdif",
>  };
>
> -struct sun4i_spdif_quirks {
> -	unsigned int reg_dac_txdata;	/* TX FIFO offset for DMA config */
> -	bool has_reset;
> -};
> -
>  static const struct sun4i_spdif_quirks sun4i_a10_spdif_quirks = {
>  	.reg_dac_txdata	= SUN4I_SPDIF_TXFIFO,
> +	.reg_fctl_ftx   = SUN4I_SPDIF_FCTL_FTX,
>  };
>
>  static const struct sun4i_spdif_quirks sun6i_a31_spdif_quirks = {
>  	.reg_dac_txdata	= SUN4I_SPDIF_TXFIFO,
> +	.reg_fctl_ftx   = SUN4I_SPDIF_FCTL_FTX,
>  	.has_reset	= true,
>  };
>
>  static const struct sun4i_spdif_quirks sun8i_h3_spdif_quirks = {
>  	.reg_dac_txdata	= SUN8I_SPDIF_TXFIFO,
> +	.reg_fctl_ftx   = SUN4I_SPDIF_FCTL_FTX,
> +	.has_reset	= true,
> +};
>
> +static const struct sun4i_spdif_quirks sun50i_h6_spdif_quirks = {
> +	.reg_dac_txdata	= SUN8I_SPDIF_TXFIFO,
> +	.reg_fctl_ftx   = SUN50I_H6_SPDIF_FCTL_FTX,
>  	.has_reset	= true,

The reg_dac_txdata and reg_fctl_ftx changes here should also be part
of a separate patch.

Maxime

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

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