linux-kernel - Re: [PATCH V3 06/12] ASoC: amd: irq handler changes for ACP5x PCM dma driver

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Date:   Mon, 19 Jul 2021 13:11:13 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vijendar Mukunda <vijendar.mukunda@....com>, broonie@...nel.org,
        alsa-devel@...a-project.org
Cc:     Sunil-kumar.Dommati@....com,
        open list <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>, Alexander.Deucher@....com,
        krisman@...labora.com
Subject: Re: [PATCH V3 06/12] ASoC: amd: irq handler changes for ACP5x PCM dma
 driver


> +static irqreturn_t i2s_irq_handler(int irq, void *dev_id)
> +{
> +	struct i2s_dev_data *vg_i2s_data;
> +	u16 irq_flag;
> +	u32 val;
> +
> +	vg_i2s_data = dev_id;
> +	if (!vg_i2s_data)
> +		return IRQ_NONE;
> +
> +	irq_flag = 0;
> +	val = acp_readl(vg_i2s_data->acp5x_base + ACP_EXTERNAL_INTR_STAT);
> +	if ((val & BIT(HS_TX_THRESHOLD)) && vg_i2s_data->play_stream) {
> +		acp_writel(BIT(HS_TX_THRESHOLD), vg_i2s_data->acp5x_base +
> +			   ACP_EXTERNAL_INTR_STAT);
> +		snd_pcm_period_elapsed(vg_i2s_data->play_stream);
> +		irq_flag = 1;
> +	}
> +	if ((val & BIT(I2S_TX_THRESHOLD)) &&
> +	    vg_i2s_data->i2ssp_play_stream) {

use single line?

> +		acp_writel(BIT(I2S_TX_THRESHOLD),
> +			   vg_i2s_data->acp5x_base + ACP_EXTERNAL_INTR_STAT);
> +		snd_pcm_period_elapsed(vg_i2s_data->i2ssp_play_stream);
> +		irq_flag = 1;
> +	}
> +
> +	if ((val & BIT(HS_RX_THRESHOLD)) && vg_i2s_data->capture_stream) {
> +		acp_writel(BIT(HS_RX_THRESHOLD), vg_i2s_data->acp5x_base +
> +			   ACP_EXTERNAL_INTR_STAT);
> +		snd_pcm_period_elapsed(vg_i2s_data->capture_stream);
> +		irq_flag = 1;
> +	}
> +	if ((val & BIT(I2S_RX_THRESHOLD)) &&
> +	    vg_i2s_data->i2ssp_capture_stream) {

use single line?

> +		acp_writel(BIT(I2S_RX_THRESHOLD),
> +			   vg_i2s_data->acp5x_base + ACP_EXTERNAL_INTR_STAT);
> +		snd_pcm_period_elapsed(vg_i2s_data->i2ssp_capture_stream);
> +		irq_flag = 1;
> +	}
> +
> +	if (irq_flag)
> +		return IRQ_HANDLED;
> +	else
> +		return IRQ_NONE;
> +}
> +
>  static int acp5x_audio_probe(struct platform_device *pdev)
>  {
>  	struct resource *res;
>  	struct i2s_dev_data *adata;
> +	unsigned int irqflags;
>  	int status;
>  
>  	if (!pdev->dev.platform_data) {
> @@ -47,6 +94,14 @@ static int acp5x_audio_probe(struct platform_device *pdev)
>  					 resource_size(res));
>  	if (!adata->acp5x_base)
>  		return -ENOMEM;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> +	if (!res) {
> +		dev_err(&pdev->dev, "IORESOURCE_IRQ FAILED\n");
> +		return -ENODEV;
> +	}
> +
> +	adata->i2s_irq = res->start;
>  	dev_set_drvdata(&pdev->dev, adata);
>  	status = devm_snd_soc_register_component(&pdev->dev,
>  						 &acp5x_i2s_component,
> @@ -55,6 +110,12 @@ static int acp5x_audio_probe(struct platform_device *pdev)
>  		dev_err(&pdev->dev, "Fail to register acp i2s component\n");
>  		return -ENODEV;
>  	}
> +	status = devm_request_irq(&pdev->dev, adata->i2s_irq, i2s_irq_handler,
> +				  irqflags, "ACP5x_I2S_IRQ", adata);
> +	if (status) {
> +		dev_err(&pdev->dev, "ACP5x I2S IRQ request failed\n");
> +		return -ENODEV;
> +	}

return status?

>  	return 0;
>  }
>  
> diff --git a/sound/soc/amd/vangogh/acp5x.h b/sound/soc/amd/vangogh/acp5x.h
> index d2853738eb17..18df2b5a4283 100644
> --- a/sound/soc/amd/vangogh/acp5x.h
> +++ b/sound/soc/amd/vangogh/acp5x.h
> @@ -31,9 +31,18 @@
>  #define ACP5x_HS_TDM_REG_END	0x1242824
>  #define I2S_MODE 0x00
>  #define ACP5x_I2S_MODE 0x00
> +#define	I2S_RX_THRESHOLD 27
> +#define	I2S_TX_THRESHOLD 28
> +#define	HS_TX_THRESHOLD 24
> +#define	HS_RX_THRESHOLD 23
>  
>  struct i2s_dev_data {
> +	unsigned int i2s_irq;
>  	void __iomem *acp5x_base;
> +	struct snd_pcm_substream *play_stream;
> +	struct snd_pcm_substream *capture_stream;
> +	struct snd_pcm_substream *i2ssp_play_stream;
> +	struct snd_pcm_substream *i2ssp_capture_stream;
>  };
>  
>  /* common header file uses exact offset rather than relative
>