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MLK-15960-2: ASoC: fsl_sai: refine the pm runtime function

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In imx8qm/imx8qxp, the power domain of IP is enabled when
pm_runtime_get_sync() is called, and disabled when pm_runtime
_put_sync() is called. when power domain is disabled, the value
of registers will lost, so we need to use the regcache_sync()
to restore the registers in fsl_sai_runtime_resume.

Signed-off-by: Shengjiu Wang <shengjiu.wang@freescale.com>
Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
Signed-off-by: Srikanth Krishnakar <Srikanth_Krishnakar@mentor.com>
This commit is contained in:
Shengjiu Wang
2017-07-12 18:00:58 +08:00
committed by Leonard Crestez
parent 294bfa70de
commit 760bd61874
1 changed files with 15 additions and 4 deletions
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19
sound/soc/fsl/fsl_sai.c
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@ -702,8 +702,6 @@ static int fsl_sai_startup(struct snd_pcm_substream *substream,
else
sai->is_stream_opened[tx] = true;
pm_runtime_get_sync(cpu_dai->dev);
ret = clk_prepare_enable(sai->bus_clk);
if (ret) {
dev_err(dev, "failed to enable bus clock: %d\n", ret);
@ -739,7 +737,6 @@ static void fsl_sai_shutdown(struct snd_pcm_substream *substream,
FSL_SAI_CR3_TRCE_MASK, 0);
clk_disable_unprepare(sai->bus_clk);
sai->is_stream_opened[tx] = false;
pm_runtime_put_sync(cpu_dai->dev);
}
}
@ -1108,6 +1105,8 @@ static int fsl_sai_probe(struct platform_device *pdev)
pm_runtime_enable(&pdev->dev);
regcache_cache_only(sai->regmap, true);
ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
&fsl_sai_dai, 1);
if (ret)
@ -1126,19 +1125,31 @@ static int fsl_sai_probe(struct platform_device *pdev)
static int fsl_sai_runtime_resume(struct device *dev)
{
struct fsl_sai *sai = dev_get_drvdata(dev);
unsigned char offset = sai->soc->reg_offset;
request_bus_freq(BUS_FREQ_AUDIO);
if (sai->soc->flags & SAI_FLAG_PMQOS)
pm_qos_add_request(&sai->pm_qos_req,
PM_QOS_CPU_DMA_LATENCY, 0);
return 0;
regcache_cache_only(sai->regmap, false);
regcache_mark_dirty(sai->regmap);
regmap_write(sai->regmap, FSL_SAI_TCSR(offset), FSL_SAI_CSR_SR);
regmap_write(sai->regmap, FSL_SAI_RCSR(offset), FSL_SAI_CSR_SR);
usleep_range(1000, 2000);
regmap_write(sai->regmap, FSL_SAI_TCSR(offset), 0);
regmap_write(sai->regmap, FSL_SAI_RCSR(offset), 0);
return regcache_sync(sai->regmap);
}
static int fsl_sai_runtime_suspend(struct device *dev)
{
struct fsl_sai *sai = dev_get_drvdata(dev);
regcache_cache_only(sai->regmap, true);
release_bus_freq(BUS_FREQ_AUDIO);
if (sai->soc->flags & SAI_FLAG_PMQOS)