linux-kernel - Re: [PATCH 2/9] ASoC: amd: ps: handle soundwire interrupts in acp pci driver

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Date:   Tue, 16 May 2023 09:39:13 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vijendar Mukunda <Vijendar.Mukunda@....com>,
        --to=broonie@...nel.org
Cc:     alsa-devel@...a-project.org, Basavaraj.Hiregoudar@....com,
        Sunil-kumar.Dommati@....com, Mastan.Katragadda@....com,
        Arungopal.kondaveeti@....com, Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Syed Saba Kareem <Syed.SabaKareem@....com>,
        Mario Limonciello <mario.limonciello@....com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/9] ASoC: amd: ps: handle soundwire interrupts in acp pci
 driver



On 5/16/23 05:35, Vijendar Mukunda wrote:
> Handle soundwire manager related interrupts in ACP PCI driver
> interrupt handler and schedule soundwire manager work queue for
> further processing.

"SoundWire" please

> 
> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
> ---
>  sound/soc/amd/ps/acp63.h  |  4 ++++
>  sound/soc/amd/ps/pci-ps.c | 42 ++++++++++++++++++++++++++++++++++-----
>  2 files changed, 41 insertions(+), 5 deletions(-)
> 
> diff --git a/sound/soc/amd/ps/acp63.h b/sound/soc/amd/ps/acp63.h
> index f27f71116598..faf7be4d77c2 100644
> --- a/sound/soc/amd/ps/acp63.h
> +++ b/sound/soc/amd/ps/acp63.h
> @@ -67,6 +67,10 @@
>  /* time in ms for acp timeout */
>  #define ACP_TIMEOUT		500
>  
> +#define ACP_SDW0_IRQ_MASK		21
> +#define ACP_SDW1_IRQ_MASK		2
> +#define ACP_ERROR_IRQ_MASK		29

Shouldn't this be in 0x representation or BIT/GENMASK?

> +
>  enum acp_config {
>  	ACP_CONFIG_0 = 0,
>  	ACP_CONFIG_1,
> diff --git a/sound/soc/amd/ps/pci-ps.c b/sound/soc/amd/ps/pci-ps.c
> index f3aa08dc05b2..6566ee14d300 100644
> --- a/sound/soc/amd/ps/pci-ps.c
> +++ b/sound/soc/amd/ps/pci-ps.c
> @@ -56,6 +56,7 @@ static int acp63_reset(void __iomem *acp_base)
>  static void acp63_enable_interrupts(void __iomem *acp_base)
>  {
>  	writel(1, acp_base + ACP_EXTERNAL_INTR_ENB);
> +	writel(BIT(ACP_ERROR_IRQ_MASK), acp_base + ACP_EXTERNAL_INTR_CNTL);

BIT(FOO_MASK) is very odd.

BIT(ACP_ERROR_IRQ) or ACP_ERROR_IRQ_MASK?

>  }
>  
>  static void acp63_disable_interrupts(void __iomem *acp_base)
> @@ -102,23 +103,54 @@ 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;
> +	ext_intr_stat = readl(adata->acp63_base + ACP_EXTERNAL_INTR_STAT);
> +	if (ext_intr_stat & BIT(ACP_SDW0_IRQ_MASK)) {
> +		writel(BIT(ACP_SDW0_IRQ_MASK), 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)
> +			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 & BIT(ACP_SDW1_IRQ_MASK)) {
> +		writel(BIT(ACP_SDW1_IRQ_MASK), 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)
> +			schedule_work(&amd_manager->amd_sdw_irq_thread);
> +		irq_flag = 1;
> +	}
> +
> +	if (ext_intr_stat & BIT(ACP_ERROR_IRQ_MASK)) {
> +		writel(BIT(ACP_ERROR_IRQ_MASK), adata->acp63_base + ACP_EXTERNAL_INTR_STAT);
> +		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;

it's not clear what this does? Looks like just filtering out interrupts
without doing anything about the interrupt source?

> +	}
> +
> +	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)