Re: [PATCH v2] ASoC: amd: renoir: restore two more registers during resume

["Mukunda,Vijendar" <vijendar.mukunda@amd.com>]

On 30/07/20 6:01 pm, Hui Wang wrote:
> Recently we found an issue about the suspend and resume. If dmic is
> recording the sound, and we run suspend and resume, after the resume,
> the dmic can't work well anymore. we need to close the app and reopen
> the app, then the dmic could record the sound again.
> 
> For example, we run "arecord -D hw:CARD=acp,DEV=0 -f S32_LE -c 2
> -r 48000 test.wav", then suspend and resume, after the system resume
> back, we speak to the dmic. then stop the arecord, use aplay to play
> the test.wav, we could hear the sound recorded after resume is weird,
> it is not what we speak to the dmic.
> 
> I found two registers are set in the dai_hw_params(), if the two
> registers are set during the resume, this issue could be fixed.
> Move the code of the dai_hw_params() into the pdm_dai_trigger(), then
> these two registers will be set during resume since pdm_dai_trigger()
> will be called during resume. And delete the empty function
> dai_hw_params().
> 
> Cc: stable@vger.kernel.org
> Signed-off-by: Hui Wang <hui.wang@canonical.com>
Reviewed-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
> ---
>   sound/soc/amd/renoir/acp3x-pdm-dma.c | 29 +++++++++-------------------
>   1 file changed, 9 insertions(+), 20 deletions(-)
> 
> diff --git a/sound/soc/amd/renoir/acp3x-pdm-dma.c b/sound/soc/amd/renoir/acp3x-pdm-dma.c
> index 623dfd3ea705..7b14d9a81b97 100644
> --- a/sound/soc/amd/renoir/acp3x-pdm-dma.c
> +++ b/sound/soc/amd/renoir/acp3x-pdm-dma.c
> @@ -314,40 +314,30 @@ static int acp_pdm_dma_close(struct snd_soc_component *component,
>   	return 0;
>   }
>   
> -static int acp_pdm_dai_hw_params(struct snd_pcm_substream *substream,
> -				 struct snd_pcm_hw_params *params,
> -				 struct snd_soc_dai *dai)
> +static int acp_pdm_dai_trigger(struct snd_pcm_substream *substream,
> +			       int cmd, struct snd_soc_dai *dai)
>   {
>   	struct pdm_stream_instance *rtd;
> +	int ret;
> +	bool pdm_status;
>   	unsigned int ch_mask;
>   
>   	rtd = substream->runtime->private_data;
> -	switch (params_channels(params)) {
> +	ret = 0;
> +	switch (substream->runtime->channels) {
>   	case TWO_CH:
>   		ch_mask = 0x00;
>   		break;
>   	default:
>   		return -EINVAL;
>   	}
> -	rn_writel(ch_mask, rtd->acp_base + ACP_WOV_PDM_NO_OF_CHANNELS);
> -	rn_writel(PDM_DECIMATION_FACTOR, rtd->acp_base +
> -		  ACP_WOV_PDM_DECIMATION_FACTOR);
> -	return 0;
> -}
> -
> -static int acp_pdm_dai_trigger(struct snd_pcm_substream *substream,
> -			       int cmd, struct snd_soc_dai *dai)
> -{
> -	struct pdm_stream_instance *rtd;
> -	int ret;
> -	bool pdm_status;
> -
> -	rtd = substream->runtime->private_data;
> -	ret = 0;
>   	switch (cmd) {
>   	case SNDRV_PCM_TRIGGER_START:
>   	case SNDRV_PCM_TRIGGER_RESUME:
>   	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
> +		rn_writel(ch_mask, rtd->acp_base + ACP_WOV_PDM_NO_OF_CHANNELS);
> +		rn_writel(PDM_DECIMATION_FACTOR, rtd->acp_base +
> +			  ACP_WOV_PDM_DECIMATION_FACTOR);
>   		rtd->bytescount = acp_pdm_get_byte_count(rtd,
>   							 substream->stream);
>   		pdm_status = check_pdm_dma_status(rtd->acp_base);
> @@ -369,7 +359,6 @@ static int acp_pdm_dai_trigger(struct snd_pcm_substream *substream,
>   }
>   
>   static struct snd_soc_dai_ops acp_pdm_dai_ops = {
> -	.hw_params = acp_pdm_dai_hw_params,
>   	.trigger   = acp_pdm_dai_trigger,
>   };
>   
>