linux-kernel - Re: [PATCH v1 3/5] ASoC: dwc: i2s: Add StarFive JH7110 SoC support

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Message-ID: <fdd771cc-9354-208b-e8be-50d2ec6a40c9@inbox.ru>
Date:   Thu, 3 Aug 2023 08:16:06 +0300
From:   Maxim Kochetkov <fido_max@...ox.ru>
To:     Xingyu Wu <xingyu.wu@...rfivetech.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>
Cc:     Jose Abreu <joabreu@...opsys.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Walker Chen <walker.chen@...rfivetech.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v1 3/5] ASoC: dwc: i2s: Add StarFive JH7110 SoC support



On 02.08.2023 11:42, Xingyu Wu wrote:

> diff --git a/sound/soc/dwc/dwc-i2s.c b/sound/soc/dwc/dwc-i2s.c
> index c076090a9864..4dfbd8ddbcf5 100644
> --- a/sound/soc/dwc/dwc-i2s.c
> +++ b/sound/soc/dwc/dwc-i2s.c
> @@ -16,6 +16,7 @@
>   #include <linux/init.h>
>   #include <linux/io.h>
>   #include <linux/interrupt.h>
> +#include <linux/mfd/syscon.h>
>   #include <linux/module.h>
>   #include <linux/reset.h>
>   #include <linux/slab.h>
> @@ -198,7 +199,7 @@ static void i2s_start(struct dw_i2s_dev *dev,
>   	else
>   		i2s_write_reg(dev->i2s_base, IRER, 1);
>   
> -	if (dev->use_pio)
> +	if (dev->use_pio || dev->is_jh7110)
>   		i2s_enable_irqs(dev, substream->stream, config->chan_nr);
>   	else
>   		i2s_enable_dma(dev, substream->stream);
> @@ -216,7 +217,7 @@ static void i2s_stop(struct dw_i2s_dev *dev,
>   	else
>   		i2s_write_reg(dev->i2s_base, IRER, 0);
>   
> -	if (dev->use_pio)
> +	if (dev->use_pio || dev->is_jh7110)
>   		i2s_disable_irqs(dev, substream->stream, 8);
>   	else
>   		i2s_disable_dma(dev, substream->stream);

Why do we need to enable interrupts for DMA mode?

> @@ -227,6 +228,21 @@ static void i2s_stop(struct dw_i2s_dev *dev,
>   	}
>   }
>   
> +static int dw_i2s_startup(struct snd_pcm_substream *substream,
> +			  struct snd_soc_dai *cpu_dai)
> +{
> +	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
> +
> +	if (dev->is_jh7110) {
> +		struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
> +		struct snd_soc_dai_link *dai_link = rtd->dai_link;
> +
> +		dai_link->trigger_stop = SND_SOC_TRIGGER_ORDER_LDC;
> +	}
> +
> +	return 0;
> +}
> +
>   static void dw_i2s_config(struct dw_i2s_dev *dev, int stream)
>   {
>   	u32 ch_reg;
> @@ -267,6 +283,11 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
>   		config->data_width = 16;
>   		dev->ccr = 0x00;
>   		dev->xfer_resolution = 0x02;
> +		/* Set DMA buswidth on JH7110 */
> +		if (dev->is_jh7110) {
> +			dev->play_dma_data.dt.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
> +			dev->capture_dma_data.dt.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
> +		}

Not needed.
See: 
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?h=next-20230802&id=6f80197f40515853814d0f22e5209d53f899ab91
Proper bus width calculations is performed by 
snd_hwparams_to_dma_slave_config()

>   		break;
>   
>   	case SNDRV_PCM_FORMAT_S24_LE:
> @@ -279,6 +300,11 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
>   		config->data_width = 32;
>   		dev->ccr = 0x10;
>   		dev->xfer_resolution = 0x05;
> +		/* Set DMA buswidth on JH7110 */
> +		if (dev->is_jh7110) {
> +			dev->play_dma_data.dt.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
> +			dev->capture_dma_data.dt.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
> +		}

Not needed.