Re: [PATCH V3 6/9] ASoC: amd: ps: add pm ops support for SoundWire dma driver

[Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>]

On 6/6/23 01:07, Vijendar Mukunda wrote:
> Add support pm ops support for SoundWire dma driver.
> 
> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
> ---
>  sound/soc/amd/ps/ps-sdw-dma.c | 98 ++++++++++++++++++++++++++++++++++-
>  1 file changed, 96 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/soc/amd/ps/ps-sdw-dma.c b/sound/soc/amd/ps/ps-sdw-dma.c
> index 06d847c6a50e..118f4c3674ab 100644
> --- a/sound/soc/amd/ps/ps-sdw-dma.c
> +++ b/sound/soc/amd/ps/ps-sdw-dma.c
> @@ -12,6 +12,7 @@
>  #include <sound/pcm_params.h>
>  #include <sound/soc.h>
>  #include <sound/soc-dai.h>
> +#include <linux/pm_runtime.h>
>  #include <linux/soundwire/sdw_amd.h>
>  #include "acp63.h"
>  
> @@ -102,6 +103,29 @@ static const struct snd_pcm_hardware acp63_sdw_hardware_capture = {
>  	.periods_max = SDW_CAPTURE_MAX_NUM_PERIODS,
>  };
>  
> +static void acp63_enable_disable_sdw_dma_interrupts(void __iomem *acp_base, bool enable)
> +{
> +	u32 ext_intr_cntl, ext_intr_cntl1;
> +	u32 irq_mask = ACP_SDW_DMA_IRQ_MASK;
> +	u32 irq_mask1 = ACP_P1_SDW_DMA_IRQ_MASK;
> +
> +	if (enable) {
> +		ext_intr_cntl = readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
> +		ext_intr_cntl |= irq_mask;
> +		writel(ext_intr_cntl, acp_base + ACP_EXTERNAL_INTR_CNTL);
> +		ext_intr_cntl1 = readl(acp_base + ACP_EXTERNAL_INTR_CNTL1);
> +		ext_intr_cntl1 |= irq_mask1;
> +		writel(ext_intr_cntl1, acp_base + ACP_EXTERNAL_INTR_CNTL1);
> +	} else {
> +		ext_intr_cntl = readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
> +		ext_intr_cntl &= ~irq_mask;
> +		writel(ext_intr_cntl, acp_base + ACP_EXTERNAL_INTR_CNTL);
> +		ext_intr_cntl1 = readl(acp_base + ACP_EXTERNAL_INTR_CNTL1);
> +		ext_intr_cntl1 &= ~irq_mask1;
> +		writel(ext_intr_cntl1, acp_base + ACP_EXTERNAL_INTR_CNTL1);
> +	}
> +}
> +
>  static void acp63_config_dma(struct acp_sdw_dma_stream *stream, void __iomem *acp_base,
>  			     u32 stream_id)
>  {
> @@ -464,16 +488,86 @@ 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_mark_last_busy(&pdev->dev);
> +	pm_runtime_set_active(&pdev->dev);
> +	pm_runtime_enable(&pdev->dev);
> +	return 0;
> +}
>  
> -	return status;
> +static int acp63_sdw_platform_remove(struct platform_device *pdev)
> +{
> +	pm_runtime_disable(&pdev->dev);
> +	return 0;
>  }
>  
> +static int acp_restore_sdw_dma_config(struct sdw_dma_dev_data *sdw_data)
> +{
> +	struct acp_sdw_dma_stream *stream;
> +	struct snd_pcm_substream *substream;
> +	struct snd_pcm_runtime *runtime;
> +	u32 period_bytes, buf_size, water_mark_size_reg;
> +	u32 stream_count;
> +	int index, instance, ret;
> +
> +	for (instance = 0; instance < AMD_SDW_MAX_MANAGERS; instance++) {
> +		if (instance == ACP_SDW0)
> +			stream_count = ACP63_SDW0_DMA_MAX_STREAMS;
> +		else
> +			stream_count = ACP63_SDW1_DMA_MAX_STREAMS;
> +
> +		for (index = 0; index < stream_count; index++) {
> +			if (instance == ACP_SDW0) {
> +				substream = sdw_data->sdw0_dma_stream[index];
> +				water_mark_size_reg =
> +						sdw0_dma_ring_buf_reg[index].water_mark_size_reg;
> +			} else {
> +				substream = sdw_data->sdw1_dma_stream[index];
> +				water_mark_size_reg =
> +						sdw1_dma_ring_buf_reg[index].water_mark_size_reg;
> +			}
> +
> +			if (substream && substream->runtime) {

can this be false?
> +				runtime = substream->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, instance);
> +				if (ret)
> +					return ret;
> +				writel(period_bytes, sdw_data->acp_base + water_mark_size_reg);
> +			}> +		}
> +	}
> +	acp63_enable_disable_sdw_dma_interrupts(sdw_data->acp_base, true);
> +	return 0;
> +}
> +
> +static int __maybe_unused acp63_sdw_pcm_resume(struct device *dev)
> +{
> +	struct sdw_dma_dev_data *sdw_data;
> +
> +	sdw_data = dev_get_drvdata(dev);
> +	return acp_restore_sdw_dma_config(sdw_data);
> +}
> +
> +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,
>  	},
>  };
>