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

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Date:   Tue, 23 May 2023 10:03:15 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     "Mukunda,Vijendar" <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.
> We have used pm_runtime_allow() to allow the device immediately
> enter runtime suspend state. Yes you are correct. If we use pm_runtime_allow(),
> then in remove sequence we should use pm_runtime_forbid call.
>> Also is there not a pm_runtime_set_active() missing?
> 
> 
> We will change the sequence as mentioned below.
> 
> in probe sequence , we will use
> 
>     pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);
>     pm_runtime_use_autosuspend(&pdev->dev);
>     pm_runtime_mark_last_busy(&pdev->dev);
>     pm_runtime_set_active(&pdev->dev);
>     pm_runtime_enable(&pdev->dev);
> 
> In remove sequence
> 
> pm_runtime_disable(&pdev->dev);

sounds about right.

>>
>>> +	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?
> In hw_params() callback, we are setting period_bytes and buf_size from
> params structure. We are extracting same variables from runtime structures
> in resume() callback.
> We can implement a helper function to further simplify above logic
> instead of having two separate loops.

ok