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Subject: Re: [PATCH v3] ASoC: qcom: Fix playback recover problem in suspend
 resume
To:     Srinivasa Rao Mandadapu <srivasam@codeaurora.org>,
        agross@kernel.org, bjorn.andersson@linaro.org, lgirdwood@gmail.com,
        broonie@kernel.org, robh+dt@kernel.org, plai@codeaurora.org,
        bgoswami@codeaurora.org, perex@perex.cz, tiwai@suse.com,
        rohitkr@codeaurora.org, linux-arm-msm@vger.kernel.org,
        alsa-devel@alsa-project.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     V Sujith Kumar Reddy <vsujithk@codeaurora.org>
References: <1606470988-26965-1-git-send-email-srivasam@codeaurora.org>
From:   Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Message-ID: <1146040c-5559-f4bf-fafe-eb7468e577a0@linaro.org>
Date:   Fri, 27 Nov 2020 12:09:51 +0000
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On 27/11/2020 09:56, Srinivasa Rao Mandadapu wrote:
> To support playback continuation after hard suspend(bypass powerd)
>   and resume:
> Prepare device in  platform trigger callback.
> Make I2s and DMA control registers as non volatile.
Looks like there are two changes here, One is fixing the volatile registers!


Other is preparing device after suspend!

Consider splitting them!

> 

Fixes tag is missing here?

> Signed-off-by: V Sujith Kumar Reddy <vsujithk@codeaurora.org>
> Signed-off-by: Srinivasa Rao Mandadapu <srivasam@codeaurora.org>
> ---
> Changes Since v1 and v2:
>    -- Subject lines changed
> 
>   sound/soc/qcom/lpass-cpu.c      | 8 ++------
>   sound/soc/qcom/lpass-platform.c | 5 +++--
>   2 files changed, 5 insertions(+), 8 deletions(-)
> 
> diff --git a/sound/soc/qcom/lpass-cpu.c b/sound/soc/qcom/lpass-cpu.c
> index af684fd..c99be03 100644
> --- a/sound/soc/qcom/lpass-cpu.c
> +++ b/sound/soc/qcom/lpass-cpu.c
> @@ -454,20 +454,16 @@ static bool lpass_cpu_regmap_volatile(struct device *dev, unsigned int reg)
>   	struct lpass_variant *v = drvdata->variant;
>   	int i;
>   
> -	for (i = 0; i < v->i2s_ports; ++i)
> -		if (reg == LPAIF_I2SCTL_REG(v, i))
> -			return true;
>   	for (i = 0; i < v->irq_ports; ++i)
>   		if (reg == LPAIF_IRQSTAT_REG(v, i))
>   			return true;
>   
>   	for (i = 0; i < v->rdma_channels; ++i)
> -		if (reg == LPAIF_RDMACURR_REG(v, i) || reg == LPAIF_RDMACTL_REG(v, i))
> +		if (reg == LPAIF_RDMACURR_REG(v, i))
>   			return true;
>   
>   	for (i = 0; i < v->wrdma_channels; ++i)
> -		if (reg == LPAIF_WRDMACURR_REG(v, i + v->wrdma_channel_start) ||
> -			reg == LPAIF_WRDMACTL_REG(v, i + v->wrdma_channel_start))
> +		if (reg == LPAIF_WRDMACURR_REG(v, i + v->wrdma_channel_start))
>   			return true;
>   
>   	return false;
> diff --git a/sound/soc/qcom/lpass-platform.c b/sound/soc/qcom/lpass-platform.c
> index 80b09de..2b0a7c1 100644
> --- a/sound/soc/qcom/lpass-platform.c
> +++ b/sound/soc/qcom/lpass-platform.c
> @@ -481,8 +481,9 @@ static int lpass_platform_pcmops_trigger(struct snd_soc_component *component,
>   		return -ENOTRECOVERABLE;
>   	}
>   	switch (cmd) {
> -	case SNDRV_PCM_TRIGGER_START:
>   	case SNDRV_PCM_TRIGGER_RESUME:
> +		lpass_platform_pcmops_prepare(component, substream);

Can you elaborate the actual issue here?

Are any other registers needs to re-programmed??

Does it make sense to use
regcache_mark_dirty()
regcache_sync() in pm suspend resume path,
instead of calling prepare explicitly?


--srini


> +	case SNDRV_PCM_TRIGGER_START:
>   	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
>   		ret = regmap_fields_write(dmactl->enable, id,
>   						 LPAIF_DMACTL_ENABLE_ON);
> @@ -592,7 +593,7 @@ static int lpass_platform_pcmops_trigger(struct snd_soc_component *component,
>   		break;
>   	}
>   
> -	return 0;
> +	return ret;
>   }
>   
>   static snd_pcm_uframes_t lpass_platform_pcmops_pointer(
>