linux-kernel - Re: [PATCH V2 6/9] ASoC: amd: ps: add pm ops support for SoundWire dma driver

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Message-ID: <b3812c08-96fe-f125-66c6-a7db518a37ba@linux.intel.com>
Date:   Mon, 22 May 2023 13:20:33 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vijendar Mukunda <Vijendar.Mukunda@....com>, broonie@...nel.org
Cc:     alsa-devel@...a-project.org, Basavaraj.Hiregoudar@....com,
        Sunil-kumar.Dommati@....com, Mastan.Katragadda@....com,
        Arungopal.kondaveeti@....com, mario.limonciello@....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 V2 6/9] ASoC: amd: ps: add pm ops support for SoundWire
 dma driver


> @@ -464,16 +488,79 @@ static int acp63_sdw_platform_probe(struct platform_device *pdev)
>  	status = devm_snd_soc_register_component(&pdev->dev,
>  						 &acp63_sdw_component,
>  						 NULL, 0);
> -	if (status)
> +	if (status) {
>  		dev_err(&pdev->dev, "Fail to register sdw dma component\n");
> +		return status;
> +	}
> +	pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);
> +	pm_runtime_use_autosuspend(&pdev->dev);
> +	pm_runtime_enable(&pdev->dev);
> +	pm_runtime_allow(&pdev->dev);

Can you remind me why you need the pm_runtime_allow()? I can't recall
where the _forbid() is done.

Also is there not a pm_runtime_set_active() missing?

> +	return 0;
> +}
>  
> -	return status;
> +static int acp63_sdw_platform_remove(struct platform_device *pdev)
> +{
> +	pm_runtime_disable(&pdev->dev);
> +	return 0;
>  }
>  
> +static int __maybe_unused acp63_sdw_pcm_resume(struct device *dev)
> +{
> +	struct sdw_dma_dev_data *sdw_data;
> +	struct acp_sdw_dma_stream *stream;
> +	struct snd_pcm_runtime *runtime;
> +	u32 period_bytes, buf_size, water_mark_size_reg;
> +	int ret;
> +	int index;
> +
> +	sdw_data = dev_get_drvdata(dev);
> +	for (index = 0; index < ACP63_SDW0_DMA_MAX_STREAMS; index++) {
> +		if (sdw_data->sdw0_dma_stream[index] &&
> +		    sdw_data->sdw0_dma_stream[index]->runtime) {
> +			water_mark_size_reg = sdw0_dma_ring_buf_reg[index].water_mark_size_reg;
> +			runtime = sdw_data->sdw0_dma_stream[index]->runtime;
> +			stream = runtime->private_data;
> +			period_bytes = frames_to_bytes(runtime, runtime->period_size);
> +			buf_size = frames_to_bytes(runtime, runtime->buffer_size);
> +			acp63_config_dma(stream, sdw_data->acp_base, index);
> +			ret = acp63_configure_sdw_ringbuffer(sdw_data->acp_base, index,
> +							     buf_size, ACP_SDW0);
> +			if (ret)
> +				return ret;
> +			writel(period_bytes, sdw_data->acp_base + water_mark_size_reg);
> +		}
> +	}
> +	for (index = 0; index < ACP63_SDW1_DMA_MAX_STREAMS; index++) {
> +		if (sdw_data->sdw1_dma_stream[index] &&
> +		    sdw_data->sdw1_dma_stream[index]->runtime) {
> +			water_mark_size_reg = sdw1_dma_ring_buf_reg[index].water_mark_size_reg;
> +			runtime = sdw_data->sdw1_dma_stream[index]->runtime;
> +			stream = runtime->private_data;
> +			period_bytes = frames_to_bytes(runtime, runtime->period_size);
> +			buf_size = frames_to_bytes(runtime, runtime->buffer_size);
> +			acp63_config_dma(stream, sdw_data->acp_base, index);
> +			ret = acp63_configure_sdw_ringbuffer(sdw_data->acp_base, index,
> +							     buf_size, ACP_SDW1);
> +			if (ret)
> +				return ret;
> +			writel(period_bytes, sdw_data->acp_base + water_mark_size_reg);
> +		}
> +	}

Isn't this set of configurations something that needs to be done already
somewhere else, i.e. could there be a common helper?

> +	acp63_enable_disable_sdw_dma_interrupts(sdw_data->acp_base, true);
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops acp63_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(NULL, acp63_sdw_pcm_resume)
> +};
> +
>  static struct platform_driver acp63_sdw_dma_driver = {
>  	.probe = acp63_sdw_platform_probe,
> +	.remove = acp63_sdw_platform_remove,
>  	.driver = {
>  		.name = "amd_ps_sdw_dma",
> +		.pm = &acp63_pm_ops,
>  	},
>  };
>