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ASoC: img-i2s-in: Add runtime PM 

Add runtime PM to disable the clock when the device is not in use.
The ASoC core takes care of the pm_runtime_get_sync / put calls so we
just need to provide runtime_suspend / runtime_resume functions and
enable runtime PM.

Signed-off-by: Ed Blake <ed.blake@sondrel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Ed Blake 2017-10-06 15:50:40 +01:00 committed by Mark Brown
parent 8ab7f885da
commit f65bb92ca1
1 changed files with 71 additions and 17 deletions
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88
sound/soc/img/img-i2s-in.c
View File

@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <sound/core.h>
@ -64,6 +65,29 @@ struct img_i2s_in {
u32 *suspend_ch_ctl;
};
static int img_i2s_in_runtime_suspend(struct device *dev)
{
struct img_i2s_in *i2s = dev_get_drvdata(dev);
clk_disable_unprepare(i2s->clk_sys);
return 0;
}
static int img_i2s_in_runtime_resume(struct device *dev)
{
struct img_i2s_in *i2s = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(i2s->clk_sys);
if (ret) {
dev_err(dev, "Unable to enable sys clock\n");
return ret;
}
return 0;
}
static inline void img_i2s_in_writel(struct img_i2s_in *i2s, u32 val, u32 reg)
{
writel(val, i2s->base + reg);
@ -281,7 +305,7 @@ static int img_i2s_in_hw_params(struct snd_pcm_substream *substream,
static int img_i2s_in_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai);
int i;
int i, ret;
u32 chan_control_mask, lrd_set = 0, blkp_set = 0, chan_control_set = 0;
u32 reg;
@ -321,6 +345,10 @@ static int img_i2s_in_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
chan_control_mask = IMG_I2S_IN_CH_CTL_CLK_TRANS_MASK;
ret = pm_runtime_get_sync(i2s->dev);
if (ret < 0)
return ret;
for (i = 0; i < i2s->active_channels; i++)
img_i2s_in_ch_disable(i2s, i);
@ -340,6 +368,8 @@ static int img_i2s_in_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
for (i = 0; i < i2s->active_channels; i++)
img_i2s_in_ch_enable(i2s, i);
pm_runtime_put(i2s->dev);
return 0;
}
@ -429,9 +459,15 @@ static int img_i2s_in_probe(struct platform_device *pdev)
return PTR_ERR(i2s->clk_sys);
}
ret = clk_prepare_enable(i2s->clk_sys);
if (ret)
return ret;
pm_runtime_enable(&pdev->dev);
if (!pm_runtime_enabled(&pdev->dev)) {
ret = img_i2s_in_runtime_resume(&pdev->dev);
if (ret)
goto err_pm_disable;
}
ret = pm_runtime_get_sync(&pdev->dev);
if (ret < 0)
goto err_suspend;
i2s->active_channels = 1;
i2s->dma_data.addr = res->start + IMG_I2S_IN_RX_FIFO;
@ -449,7 +485,7 @@ static int img_i2s_in_probe(struct platform_device *pdev)
if (IS_ERR(rst)) {
if (PTR_ERR(rst) == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
goto err_clk_disable;
goto err_suspend;
}
dev_dbg(dev, "No top level reset found\n");
@ -471,35 +507,40 @@ static int img_i2s_in_probe(struct platform_device *pdev)
IMG_I2S_IN_CH_CTL_JUST_MASK |
IMG_I2S_IN_CH_CTL_FW_MASK, IMG_I2S_IN_CH_CTL);
pm_runtime_put(&pdev->dev);
i2s->suspend_ch_ctl = devm_kzalloc(dev,
sizeof(*i2s->suspend_ch_ctl) * i2s->max_i2s_chan, GFP_KERNEL);
if (!i2s->suspend_ch_ctl) {
ret = -ENOMEM;
goto err_clk_disable;
goto err_suspend;
}
ret = devm_snd_soc_register_component(dev, &img_i2s_in_component,
&i2s->dai_driver, 1);
if (ret)
goto err_clk_disable;
goto err_suspend;
ret = devm_snd_dmaengine_pcm_register(dev, &img_i2s_in_dma_config, 0);
if (ret)
goto err_clk_disable;
goto err_suspend;
return 0;
err_clk_disable:
clk_disable_unprepare(i2s->clk_sys);
err_suspend:
if (!pm_runtime_enabled(&pdev->dev))
img_i2s_in_runtime_suspend(&pdev->dev);
err_pm_disable:
pm_runtime_disable(&pdev->dev);
return ret;
}
static int img_i2s_in_dev_remove(struct platform_device *pdev)
{
struct img_i2s_in *i2s = platform_get_drvdata(pdev);
clk_disable_unprepare(i2s->clk_sys);
pm_runtime_disable(&pdev->dev);
if (!pm_runtime_status_suspended(&pdev->dev))
img_i2s_in_runtime_suspend(&pdev->dev);
return 0;
}
@ -508,9 +549,15 @@ static int img_i2s_in_dev_remove(struct platform_device *pdev)
static int img_i2s_in_suspend(struct device *dev)
{
struct img_i2s_in *i2s = dev_get_drvdata(dev);
int i;
int i, ret;
u32 reg;
if (pm_runtime_status_suspended(dev)) {
ret = img_i2s_in_runtime_resume(dev);
if (ret)
return ret;
}
for (i = 0; i < i2s->max_i2s_chan; i++) {
reg = img_i2s_in_ch_readl(i2s, i, IMG_I2S_IN_CH_CTL);
i2s->suspend_ch_ctl[i] = reg;
@ -518,7 +565,7 @@ static int img_i2s_in_suspend(struct device *dev)
i2s->suspend_ctl = img_i2s_in_readl(i2s, IMG_I2S_IN_CTL);
clk_disable_unprepare(i2s->clk_sys);
img_i2s_in_runtime_suspend(dev);
return 0;
}
@ -526,10 +573,12 @@ static int img_i2s_in_suspend(struct device *dev)
static int img_i2s_in_resume(struct device *dev)
{
struct img_i2s_in *i2s = dev_get_drvdata(dev);
int i;
int i, ret;
u32 reg;
clk_prepare_enable(i2s->clk_sys);
ret = img_i2s_in_runtime_resume(dev);
if (ret)
return ret;
for (i = 0; i < i2s->max_i2s_chan; i++) {
reg = i2s->suspend_ch_ctl[i];
@ -538,6 +587,9 @@ static int img_i2s_in_resume(struct device *dev)
img_i2s_in_writel(i2s, i2s->suspend_ctl, IMG_I2S_IN_CTL);
if (pm_runtime_status_suspended(dev))
img_i2s_in_runtime_suspend(dev);
return 0;
}
#endif
@ -549,6 +601,8 @@ static const struct of_device_id img_i2s_in_of_match[] = {
MODULE_DEVICE_TABLE(of, img_i2s_in_of_match);
static const struct dev_pm_ops img_i2s_in_pm_ops = {
SET_RUNTIME_PM_OPS(img_i2s_in_runtime_suspend,
img_i2s_in_runtime_resume, NULL)
SET_SYSTEM_SLEEP_PM_OPS(img_i2s_in_suspend, img_i2s_in_resume)
};