linux-kernel - Re: [PATCH 06/13] ASoC: amd: add acp6x irq handler

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Date:   Mon, 11 Oct 2021 01:58:34 -0700
From:   Joe Perches <joe@...ches.com>
To:     Vijendar Mukunda <Vijendar.Mukunda@....com>, broonie@...nel.org,
        alsa-devel@...a-project.org
Cc:     Alexander.Deucher@....com, Basavaraj.Hiregoudar@....com,
        Sunil-kumar.Dommati@....com, Mario.Limonciello@....com,
        Richard.Gong@....com, Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/13] ASoC: amd: add acp6x irq handler

On Mon, 2021-10-11 at 11:26 +0530, Vijendar Mukunda wrote:
> Add ACP6x irq handler for handling irq events for ACP IP.
> Add pdm irq events handling.
> Whenever audio data equal to the PDM watermark level are consumed,
> interrupt is generated. Acknowledge the interrupt.

> diff --git a/sound/soc/amd/yc/pci-acp6x.c b/sound/soc/amd/yc/pci-acp6x.c
[]
> @@ -116,6 +118,33 @@ static int acp6x_deinit(void __iomem *acp_base)
>  	return 0;
>  }
> 
> +static irqreturn_t acp6x_irq_handler(int irq, void *dev_id)
> +{
> +	struct acp6x_dev_data *adata;
> +	struct pdm_dev_data *yc_pdm_data;
> +	u16 irq_flag;

irq_flag seems unnecessary.

> +	u32 val;
> +
> +	adata = dev_id;
> +	if (!adata)
> +		return IRQ_NONE;
> +
> +	irq_flag = 0;
> +	val = acp6x_readl(adata->acp6x_base + ACP_EXTERNAL_INTR_STAT);
> +	if (val & BIT(PDM_DMA_STAT)) {
> +		yc_pdm_data = dev_get_drvdata(&adata->pdev[0]->dev);
> +		acp6x_writel(BIT(PDM_DMA_STAT), adata->acp6x_base + ACP_EXTERNAL_INTR_STAT);
> +		if (yc_pdm_data->capture_stream)
> +			snd_pcm_period_elapsed(yc_pdm_data->capture_stream);
> +		irq_flag = 1;

Could be:

		return IRQ_HANDLED;

> +	}
> +
> +	if (irq_flag)
> +		return IRQ_HANDLED;
> +	else
> +		return IRQ_NONE;

and
	return IRQ_NONE;

> +}