ASoC: davinci-mcasp: add support for suspend and resume
When the system returns from suspend, it looses its configuration. Most
of it is restored by running a normal audio stream startup, but the DAI
format is left unset as that's configured on the audio device creation.
Hence, it suffices here to care for the registers which are touched by
davinci_mcasp_set_dai_fmt() and restore them when the system is resumed.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index 32ddb7f..cdfe959 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -1251,12 +1251,51 @@
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int davinci_mcasp_suspend(struct device *dev)
+{
+ struct davinci_audio_dev *a = dev_get_drvdata(dev);
+ void __iomem *base = a->base;
+
+ a->context.txfmtctl = mcasp_get_reg(base + DAVINCI_MCASP_TXFMCTL_REG);
+ a->context.rxfmtctl = mcasp_get_reg(base + DAVINCI_MCASP_RXFMCTL_REG);
+ a->context.txfmt = mcasp_get_reg(base + DAVINCI_MCASP_TXFMT_REG);
+ a->context.rxfmt = mcasp_get_reg(base + DAVINCI_MCASP_RXFMT_REG);
+ a->context.aclkxctl = mcasp_get_reg(base + DAVINCI_MCASP_ACLKXCTL_REG);
+ a->context.aclkrctl = mcasp_get_reg(base + DAVINCI_MCASP_ACLKRCTL_REG);
+ a->context.pdir = mcasp_get_reg(base + DAVINCI_MCASP_PDIR_REG);
+
+ return 0;
+}
+
+static int davinci_mcasp_resume(struct device *dev)
+{
+ struct davinci_audio_dev *a = dev_get_drvdata(dev);
+ void __iomem *base = a->base;
+
+ mcasp_set_reg(base + DAVINCI_MCASP_TXFMCTL_REG, a->context.txfmtctl);
+ mcasp_set_reg(base + DAVINCI_MCASP_RXFMCTL_REG, a->context.rxfmtctl);
+ mcasp_set_reg(base + DAVINCI_MCASP_TXFMT_REG, a->context.txfmt);
+ mcasp_set_reg(base + DAVINCI_MCASP_RXFMT_REG, a->context.rxfmt);
+ mcasp_set_reg(base + DAVINCI_MCASP_ACLKXCTL_REG, a->context.aclkxctl);
+ mcasp_set_reg(base + DAVINCI_MCASP_ACLKRCTL_REG, a->context.aclkrctl);
+ mcasp_set_reg(base + DAVINCI_MCASP_PDIR_REG, a->context.pdir);
+
+ return 0;
+}
+#endif
+
+SIMPLE_DEV_PM_OPS(davinci_mcasp_pm_ops,
+ davinci_mcasp_suspend,
+ davinci_mcasp_resume);
+
static struct platform_driver davinci_mcasp_driver = {
.probe = davinci_mcasp_probe,
.remove = davinci_mcasp_remove,
.driver = {
.name = "davinci-mcasp",
.owner = THIS_MODULE,
+ .pm = &davinci_mcasp_pm_ops,
.of_match_table = mcasp_dt_ids,
},
};
diff --git a/sound/soc/davinci/davinci-mcasp.h b/sound/soc/davinci/davinci-mcasp.h
index a9ac0c1..a2e27e1 100644
--- a/sound/soc/davinci/davinci-mcasp.h
+++ b/sound/soc/davinci/davinci-mcasp.h
@@ -43,6 +43,18 @@
/* McASP FIFO related */
u8 txnumevt;
u8 rxnumevt;
+
+#ifdef CONFIG_PM_SLEEP
+ struct {
+ u32 txfmtctl;
+ u32 rxfmtctl;
+ u32 txfmt;
+ u32 rxfmt;
+ u32 aclkxctl;
+ u32 aclkrctl;
+ u32 pdir;
+ } context;
+#endif
};
#endif /* DAVINCI_MCASP_H */