linux-kernel - [alsa-devel][PATCH 2/2] ASoC: fsl_ssi: sound is wrong after suspend/resume

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Date:	Mon, 6 Jul 2015 16:49:17 +0800
From:	Zidan Wang <zidan.wang@...escale.com>
To:	<timur@...i.org>
CC:	<nicoleotsuka@...il.com>, <lgirdwood@...il.com>,
	<broonie@...nel.org>, <perex@...ex.cz>, <tiwai@...e.de>,
	<alsa-devel@...a-project.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>,
	Zidan Wang <zidan.wang@...escale.com>
Subject: [alsa-devel][PATCH 2/2] ASoC: fsl_ssi: sound is wrong after suspend/resume

The register SFCSR is volatile, but some bits in it need to be
recovered after suspend/resume.

Signed-off-by: Zidan Wang <zidan.wang@...escale.com>
---
 sound/soc/fsl/fsl_ssi.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index 52b894f..e414f18 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -262,6 +262,9 @@ struct fsl_ssi_private {
 	unsigned int baudclk_streams;
 	unsigned int bitclk_freq;
 
+	/*regcache for SFCSR*/
+	u32 regcache_sfcsr;
+
 	/* DMA params */
 	struct snd_dmaengine_dai_dma_data dma_params_tx;
 	struct snd_dmaengine_dai_dma_data dma_params_rx;
@@ -1553,6 +1556,9 @@ static int fsl_ssi_suspend(struct device *dev)
 	struct fsl_ssi_private *ssi_private = dev_get_drvdata(dev);
 	struct regmap *regs = ssi_private->regs;
 
+	regmap_read(regs, CCSR_SSI_SFCSR,
+			&ssi_private->regcache_sfcsr);
+
 	regcache_cache_only(regs, true);
 	regcache_mark_dirty(regs);
 
@@ -1565,6 +1571,12 @@ static int fsl_ssi_resume(struct device *dev)
 	struct regmap *regs = ssi_private->regs;
 
 	regcache_cache_only(regs, false);
+
+	regmap_update_bits(regs, CCSR_SSI_SFCSR,
+			CCSR_SSI_SFCSR_RFWM1_MASK | CCSR_SSI_SFCSR_TFWM1_MASK |
+			CCSR_SSI_SFCSR_RFWM0_MASK | CCSR_SSI_SFCSR_TFWM0_MASK,
+			ssi_private->regcache_sfcsr);
+
 	return regcache_sync(regs);
 }
 #endif /* CONFIG_PM_SLEEP */
-- 
1.9.1

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