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Message-ID: <6c44969f-4d25-7b71-cd35-cd7087e083e4@linux.intel.com>
Date:   Tue, 6 Jun 2023 09:59:43 -0500
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Subject: Re: [PATCH V3 5/9] ASoC: amd: ps: add support for SoundWire DMA
 interrupts
Content-Language: en-US
To:     Vijendar Mukunda <Vijendar.Mukunda@amd.com>, broonie@kernel.org
Cc:     alsa-devel@alsa-project.org, Basavaraj.Hiregoudar@amd.com,
        Sunil-kumar.Dommati@amd.com, Mastan.Katragadda@amd.com,
        Arungopal.kondaveeti@amd.com, mario.limonciello@amd.com,
        Liam Girdwood <lgirdwood@gmail.com>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>,
        Syed Saba Kareem <Syed.SabaKareem@amd.com>,
        open list <linux-kernel@vger.kernel.org>
References: <20230606060724.2038680-1-Vijendar.Mukunda@amd.com>
 <20230606060724.2038680-6-Vijendar.Mukunda@amd.com>
From:   Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
In-Reply-To: <20230606060724.2038680-6-Vijendar.Mukunda@amd.com>
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> +enum amd_sdw0_channel {
> +	ACP_SDW0_AUDIO0_TX = 0,
> +	ACP_SDW0_AUDIO1_TX,
> +	ACP_SDW0_AUDIO2_TX,
> +	ACP_SDW0_AUDIO0_RX,
> +	ACP_SDW0_AUDIO1_RX,
> +	ACP_SDW0_AUDIO2_RX,
> +};
> +
> +enum amd_sdw1_channel {
> +	ACP_SDW1_AUDIO1_TX,
> +	ACP_SDW1_AUDIO1_RX,

any specify reason why SDW0 starts with AUDIO0 and SDW1 with AUDIO1?

> +};
> +
>  struct pdm_stream_instance {
>  	u16 num_pages;
>  	u16 channels;
> @@ -239,6 +253,8 @@ struct sdw_dma_ring_buf_reg {
>   * @sdw0_dev_index: SoundWire Manager-0 platform device index
>   * @sdw1_dev_index: SoundWire Manager-1 platform device index
>   * @sdw_dma_dev_index: SoundWire DMA controller platform device index
> + * @sdw0-dma_intr_stat: DMA interrupt status array for SoundWire manager-SW0 instance
> + * @sdw_dma_intr_stat: DMA interrupt status array for SoundWire manager-SW1 instance
>   * @acp_reset: flag set to true when bus reset is applied across all
>   * the active SoundWire manager instances
>   */
> @@ -256,6 +272,8 @@ struct acp63_dev_data {
>  	u16 sdw0_dev_index;
>  	u16 sdw1_dev_index;
>  	u16 sdw_dma_dev_index;
> +	u16 sdw0_dma_intr_stat[ACP63_SDW0_DMA_MAX_STREAMS];
> +	u16 sdw1_dma_intr_stat[ACP63_SDW1_DMA_MAX_STREAMS];
>  	bool acp_reset;
>  };
>  
> diff --git a/sound/soc/amd/ps/pci-ps.c b/sound/soc/amd/ps/pci-ps.c
> index 17e29a3e1c21..daf54fe9cafd 100644
> --- a/sound/soc/amd/ps/pci-ps.c
> +++ b/sound/soc/amd/ps/pci-ps.c
> @@ -99,14 +99,44 @@ static int acp63_deinit(void __iomem *acp_base, struct device *dev)
>  	return 0;
>  }
>  
> +static irqreturn_t acp63_irq_thread(int irq, void *context)
> +{
> +	struct sdw_dma_dev_data *sdw_dma_data;
> +	struct acp63_dev_data *adata = context;
> +	u32 stream_index;
> +	u16 pdev_index;
> +
> +	pdev_index = adata->sdw_dma_dev_index;
> +	sdw_dma_data = dev_get_drvdata(&adata->pdev[pdev_index]->dev);
> +
> +	for (stream_index = 0; stream_index < ACP63_SDW0_DMA_MAX_STREAMS; stream_index++) {
> +		if (adata->sdw0_dma_intr_stat[stream_index]) {
> +			if (sdw_dma_data->sdw0_dma_stream[stream_index])

can this test be false?

> +				snd_pcm_period_elapsed(sdw_dma_data->sdw0_dma_stream[stream_index]);
> +			adata->sdw0_dma_intr_stat[stream_index] = 0;
> +		}
> +	}
> +	for (stream_index = 0; stream_index < ACP63_SDW1_DMA_MAX_STREAMS; stream_index++) {
> +		if (adata->sdw1_dma_intr_stat[stream_index]) {
> +			if (sdw_dma_data->sdw1_dma_stream[stream_index])

can this test be false?

> +				snd_pcm_period_elapsed(sdw_dma_data->sdw1_dma_stream[stream_index]);
> +			adata->sdw1_dma_intr_stat[stream_index] = 0;
> +		}
> +	}
> +	return IRQ_HANDLED;
> +}
> +
>  static irqreturn_t acp63_irq_handler(int irq, void *dev_id)
>  {
>  	struct acp63_dev_data *adata;
>  	struct pdm_dev_data *ps_pdm_data;
>  	struct amd_sdw_manager *amd_manager;
>  	u32 ext_intr_stat, ext_intr_stat1;
> +	u32 stream_id = 0;
>  	u16 irq_flag = 0;
> +	u16 sdw_dma_irq_flag = 0;
>  	u16 pdev_index;
> +	u16 index;
>  
>  	adata = dev_id;
>  	if (!adata)
> @@ -153,6 +183,56 @@ static irqreturn_t acp63_irq_handler(int irq, void *dev_id)
>  			snd_pcm_period_elapsed(ps_pdm_data->capture_stream);
>  		irq_flag = 1;
>  	}
> +	if (ext_intr_stat & ACP_SDW_DMA_IRQ_MASK) {
> +		for (index = ACP_AUDIO2_RX_THRESHOLD; index <= ACP_AUDIO0_TX_THRESHOLD; index++) {
> +			if (ext_intr_stat & BIT(index)) {
> +				writel(BIT(index), adata->acp63_base + ACP_EXTERNAL_INTR_STAT);
> +				switch (index) {
> +				case ACP_AUDIO0_TX_THRESHOLD:
> +					stream_id = ACP_SDW0_AUDIO0_TX;
> +					break;
> +				case ACP_AUDIO1_TX_THRESHOLD:
> +					stream_id = ACP_SDW0_AUDIO1_TX;
> +					break;
> +				case ACP_AUDIO2_TX_THRESHOLD:
> +					stream_id = ACP_SDW0_AUDIO2_TX;
> +					break;
> +				case ACP_AUDIO0_RX_THRESHOLD:
> +					stream_id = ACP_SDW0_AUDIO0_RX;
> +					break;
> +				case ACP_AUDIO1_RX_THRESHOLD:
> +					stream_id = ACP_SDW0_AUDIO1_RX;
> +					break;
> +				case ACP_AUDIO2_RX_THRESHOLD:
> +					stream_id = ACP_SDW0_AUDIO2_RX;
> +					break;
> +				}
> +
> +				adata->sdw0_dma_intr_stat[stream_id] = 1;
> +				sdw_dma_irq_flag = 1;
> +			}
> +		}
> +	}
> +
> +	/* SDW1 BT RX */
> +	if (ext_intr_stat1 & ACP_P1_AUDIO1_RX_THRESHOLD) {
> +		writel(ACP_P1_AUDIO1_RX_THRESHOLD,
> +		       adata->acp63_base + ACP_EXTERNAL_INTR_STAT1);
> +		adata->sdw1_dma_intr_stat[ACP_SDW1_AUDIO1_RX] = 1;
> +		sdw_dma_irq_flag = 1;
> +	}
> +
> +	/* SDW1 BT TX*/

keep spaces before */

> +	if (ext_intr_stat1 & ACP_P1_AUDIO1_TX_THRESHOLD) {
> +		writel(ACP_P1_AUDIO1_TX_THRESHOLD,
> +		       adata->acp63_base + ACP_EXTERNAL_INTR_STAT1);
> +		adata->sdw1_dma_intr_stat[ACP_SDW1_AUDIO1_TX] = 1;
> +		sdw_dma_irq_flag = 1;
> +	}
> +
> +	if (sdw_dma_irq_flag)
> +		return IRQ_WAKE_THREAD;
> +
>  	if (irq_flag)
>  		return IRQ_HANDLED;
>  	else
> @@ -544,8 +624,8 @@ static int snd_acp63_probe(struct pci_dev *pci,
>  	ret = acp63_init(adata->acp63_base, &pci->dev);
>  	if (ret)
>  		goto release_regions;
> -	ret = devm_request_irq(&pci->dev, pci->irq, acp63_irq_handler,
> -			       irqflags, "ACP_PCI_IRQ", adata);
> +	ret = devm_request_threaded_irq(&pci->dev, pci->irq, acp63_irq_handler,
> +					acp63_irq_thread, irqflags, "ACP_PCI_IRQ", adata);
>  	if (ret) {
>  		dev_err(&pci->dev, "ACP PCI IRQ request failed\n");
>  		goto de_init;