linux-kernel - [PATCH] Asoc: qcom: Fix for problem in resume with CRAS

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Message-Id: <1606450323-21641-1-git-send-email-srivasam@codeaurora.org>
Date:   Fri, 27 Nov 2020 09:42:03 +0530
From:   Srinivasa Rao Mandadapu <srivasam@...eaurora.org>
To:     agross@...nel.org, bjorn.andersson@...aro.org, lgirdwood@...il.com,
        broonie@...nel.org, robh+dt@...nel.org, plai@...eaurora.org,
        bgoswami@...eaurora.org, perex@...ex.cz, tiwai@...e.com,
        srinivas.kandagatla@...aro.org, rohitkr@...eaurora.org,
        linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Srinivasa Rao Mandadapu <srivasam@...eaurora.org>,
        V Sujith Kumar Reddy <vsujithk@...eaurora.org>
Subject: [PATCH] Asoc: qcom: Fix for problem in resume with CRAS

To support playback continuation after resume problem in chrome
audio server:
Prepare device in  platform trigger callback.
Make I2s and DMA control registers as non volatile.

Signed-off-by: V Sujith Kumar Reddy <vsujithk@...eaurora.org>
Signed-off-by: Srinivasa Rao Mandadapu <srivasam@...eaurora.org>
---
 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);
+	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(
-- 
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