restore hw registers after power loss during a suspend/resume cycle.
Signed-off-by: Sugar Zhang sugar.zhang@rock-chips.com ---
sound/soc/rockchip/rockchip_i2s.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c index 574c6af..53970ac 100644 --- a/sound/soc/rockchip/rockchip_i2s.c +++ b/sound/soc/rockchip/rockchip_i2s.c @@ -614,9 +614,35 @@ static const struct of_device_id rockchip_i2s_match[] = { {}, };
+#ifdef CONFIG_PM_SLEEP +static int rockchip_i2s_suspend(struct device *dev) +{ + struct rk_i2s_dev *i2s = dev_get_drvdata(dev); + + regcache_mark_dirty(i2s->regmap); + + return 0; +} + +static int rockchip_i2s_resume(struct device *dev) +{ + struct rk_i2s_dev *i2s = dev_get_drvdata(dev); + int ret; + + ret = pm_runtime_get_sync(dev); + if (ret < 0) + return ret; + ret = regcache_sync(i2s->regmap); + pm_runtime_put(dev); + + return ret; +} +#endif + static const struct dev_pm_ops rockchip_i2s_pm_ops = { SET_RUNTIME_PM_OPS(i2s_runtime_suspend, i2s_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(rockchip_i2s_suspend, rockchip_i2s_resume) };
static struct platform_driver rockchip_i2s_driver = {