Re: [PATCH V3 2/9] ASoC: amd: ps: handle SoundWire interrupts in acp pci driver

[Pierre-Louis Bossart]

>  static void acp63_disable_interrupts(void __iomem *acp_base)
> @@ -102,23 +103,60 @@ static irqreturn_t acp63_irq_handler(int irq, void *dev_id)
>  {
>  	struct acp63_dev_data *adata;
>  	struct pdm_dev_data *ps_pdm_data;
> -	u32 val;
> +	struct amd_sdw_manager *amd_manager;
> +	u32 ext_intr_stat, ext_intr_stat1;
> +	u16 irq_flag = 0;
>  	u16 pdev_index;
>  
>  	adata = dev_id;
>  	if (!adata)
>  		return IRQ_NONE;
> +	/* ACP interrupts will be cleared by reading particular bit and writing
> +	 * same value to the status register. writing zero's doesn't have any
> +	 * effect.
> +	 * Bit by bit checking of IRQ field is implemented.
> +	 */
> +	ext_intr_stat = readl(adata->acp63_base + ACP_EXTERNAL_INTR_STAT);
> +	if (ext_intr_stat & ACP_SDW0_STAT) {
> +		writel(ACP_SDW0_STAT, adata->acp63_base + ACP_EXTERNAL_INTR_STAT);
> +		pdev_index = adata->sdw0_dev_index;
> +		amd_manager = dev_get_drvdata(&adata->pdev[pdev_index]->dev);
> +		if (amd_manager)

can this test be false?

> +			schedule_work(&amd_manager->amd_sdw_irq_thread);
> +		irq_flag = 1;
> +	}
>  
> -	val = readl(adata->acp63_base + ACP_EXTERNAL_INTR_STAT);
> -	if (val & BIT(PDM_DMA_STAT)) {
> +	ext_intr_stat1 = readl(adata->acp63_base + ACP_EXTERNAL_INTR_STAT1);
> +	if (ext_intr_stat1 & ACP_SDW1_STAT) {
> +		writel(ACP_SDW1_STAT, adata->acp63_base + ACP_EXTERNAL_INTR_STAT1);
> +		pdev_index = adata->sdw1_dev_index;
> +		amd_manager = dev_get_drvdata(&adata->pdev[pdev_index]->dev);
> +		if (amd_manager)

can this be false?

> +			schedule_work(&amd_manager->amd_sdw_irq_thread);
> +		irq_flag = 1;
> +	}
> +
> +	if (ext_intr_stat & ACP_ERROR_IRQ) {
> +		writel(ACP_ERROR_IRQ, adata->acp63_base + ACP_EXTERNAL_INTR_STAT);
> +		/* TODO: Report SoundWire Manager instance errors */
> +		writel(0, adata->acp63_base + ACP_SW0_I2S_ERROR_REASON);
> +		writel(0, adata->acp63_base + ACP_SW1_I2S_ERROR_REASON);
> +		writel(0, adata->acp63_base + ACP_ERROR_STATUS);
> +		irq_flag = 1;
> +	}
> +
> +	if (ext_intr_stat & BIT(PDM_DMA_STAT)) {
>  		pdev_index = adata->pdm_dev_index;
>  		ps_pdm_data = dev_get_drvdata(&adata->pdev[pdev_index]->dev);
>  		writel(BIT(PDM_DMA_STAT), adata->acp63_base + ACP_EXTERNAL_INTR_STAT);
>  		if (ps_pdm_data->capture_stream)
>  			snd_pcm_period_elapsed(ps_pdm_data->capture_stream);
> -		return IRQ_HANDLED;
> +		irq_flag = 1;
>  	}
> -	return IRQ_NONE;
> +	if (irq_flag)
> +		return IRQ_HANDLED;
> +	else
> +		return IRQ_NONE;
>  }
>  
>  static int sdw_amd_scan_controller(struct device *dev)