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ASoC: stm32: spdifrx: add power management 

Add suspend and resume sleep callbacks to STM32 SPDIFRX driver,
to support system low power modes.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.2
Olivier Moysan 2019-03-06 17:48:08 +01:00 committed by Mark Brown
parent bbfaa7d36c
commit f68c2a682d
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 39 additions and 3 deletions
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42
sound/soc/stm/stm32_spdifrx.c
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@ -21,6 +21,7 @@
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/pinctrl/consumer.h>
#include <linux/regmap.h>
#include <linux/reset.h>
@ -471,6 +472,8 @@ static int stm32_spdifrx_get_ctrl_data(struct stm32_spdifrx_data *spdifrx)
memset(spdifrx->cs, 0, SPDIFRX_CS_BYTES_NB);
memset(spdifrx->ub, 0, SPDIFRX_UB_BYTES_NB);
pinctrl_pm_select_default_state(&spdifrx->pdev->dev);
ret = stm32_spdifrx_dma_ctrl_start(spdifrx);
if (ret < 0)
return ret;
@ -502,6 +505,7 @@ static int stm32_spdifrx_get_ctrl_data(struct stm32_spdifrx_data *spdifrx)
end:
clk_disable_unprepare(spdifrx->kclk);
pinctrl_pm_select_sleep_state(&spdifrx->pdev->dev);
return ret;
}
@ -611,10 +615,15 @@ static bool stm32_spdifrx_readable_reg(struct device *dev, unsigned int reg)
static bool stm32_spdifrx_volatile_reg(struct device *dev, unsigned int reg)
{
if (reg == STM32_SPDIFRX_DR)
switch (reg) {
case STM32_SPDIFRX_DR:
case STM32_SPDIFRX_CSR:
case STM32_SPDIFRX_SR:
case STM32_SPDIFRX_DIR:
return true;
return false;
default:
return false;
}
}
static bool stm32_spdifrx_writeable_reg(struct device *dev, unsigned int reg)
@ -638,6 +647,7 @@ static const struct regmap_config stm32_h7_spdifrx_regmap_conf = {
.volatile_reg = stm32_spdifrx_volatile_reg,
.writeable_reg = stm32_spdifrx_writeable_reg,
.fast_io = true,
.cache_type = REGCACHE_FLAT,
};
static irqreturn_t stm32_spdifrx_isr(int irq, void *devid)
@ -983,10 +993,36 @@ static int stm32_spdifrx_remove(struct platform_device *pdev)
MODULE_DEVICE_TABLE(of, stm32_spdifrx_ids);
#ifdef CONFIG_PM_SLEEP
static int stm32_spdifrx_suspend(struct device *dev)
{
struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(dev);
regcache_cache_only(spdifrx->regmap, true);
regcache_mark_dirty(spdifrx->regmap);
return 0;
}
static int stm32_spdifrx_resume(struct device *dev)
{
struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(dev);
regcache_cache_only(spdifrx->regmap, false);
return regcache_sync(spdifrx->regmap);
}
#endif /* CONFIG_PM_SLEEP */
static const struct dev_pm_ops stm32_spdifrx_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(stm32_spdifrx_suspend, stm32_spdifrx_resume)
};
static struct platform_driver stm32_spdifrx_driver = {
.driver = {
.name = "st,stm32-spdifrx",
.of_match_table = stm32_spdifrx_ids,
.pm = &stm32_spdifrx_pm_ops,
},
.probe = stm32_spdifrx_probe,
.remove = stm32_spdifrx_remove,