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ASoC: sh: fsi: Add runtime PM support 

This patch add support runtime PM.
Driver callbacks for Runtime PM are empty because
the device registers are always re-initialized after
pm_runtime_get_sync(). The Runtime PM functions replaces the
clock framework module stop bit handling in this driver.

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
hifive-unleashed-5.1
Kuninori Morimoto 2009-11-30 20:24:48 +09:00 committed by Mark Brown
parent d53bd80cb3
commit 785d1c45ce
1 changed files with 25 additions and 14 deletions
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39
sound/soc/sh/fsi.c
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@ -17,7 +17,7 @@
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/list.h>
#include <linux/clk.h>
#include <linux/pm_runtime.h>
#include <linux/io.h>
#include <sound/core.h>
#include <sound/pcm.h>
@ -105,7 +105,6 @@ struct fsi_priv {
struct fsi_master {
void __iomem *base;
int irq;
struct clk *clk;
struct fsi_priv fsia;
struct fsi_priv fsib;
struct sh_fsi_platform_info *info;
@ -559,7 +558,7 @@ static int fsi_dai_startup(struct snd_pcm_substream *substream,
int is_master;
int ret = 0;
clk_enable(master->clk);
pm_runtime_get_sync(dai->dev);
/* CKG1 */
data = is_play ? (1 << 0) : (1 << 4);
@ -674,7 +673,7 @@ static void fsi_dai_shutdown(struct snd_pcm_substream *substream,
fsi_irq_disable(fsi, is_play);
fsi_clk_ctrl(fsi, 0);
clk_disable(master->clk);
pm_runtime_put_sync(dai->dev);
}
static int fsi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
@ -872,7 +871,6 @@ EXPORT_SYMBOL_GPL(fsi_soc_platform);
static int fsi_probe(struct platform_device *pdev)
{
struct resource *res;
char clk_name[8];
unsigned int irq;
int ret;
@ -903,14 +901,8 @@ static int fsi_probe(struct platform_device *pdev)
master->fsia.base = master->base;
master->fsib.base = master->base + 0x40;
/* FSI is based on SPU mstp */
snprintf(clk_name, sizeof(clk_name), "spu%d", pdev->id);
master->clk = clk_get(NULL, clk_name);
if (IS_ERR(master->clk)) {
dev_err(&pdev->dev, "cannot get %s mstp\n", clk_name);
ret = -EIO;
goto exit_iounmap;
}
pm_runtime_enable(&pdev->dev);
pm_runtime_resume(&pdev->dev);
fsi_soc_dai[0].dev = &pdev->dev;
fsi_soc_dai[1].dev = &pdev->dev;
@ -935,6 +927,7 @@ exit_free_irq:
free_irq(irq, master);
exit_iounmap:
iounmap(master->base);
pm_runtime_disable(&pdev->dev);
exit_kfree:
kfree(master);
master = NULL;
@ -947,7 +940,7 @@ static int fsi_remove(struct platform_device *pdev)
snd_soc_unregister_dais(fsi_soc_dai, ARRAY_SIZE(fsi_soc_dai));
snd_soc_unregister_platform(&fsi_soc_platform);
clk_put(master->clk);
pm_runtime_disable(&pdev->dev);
free_irq(master->irq, master);
@ -957,9 +950,27 @@ static int fsi_remove(struct platform_device *pdev)
return 0;
}
static int fsi_runtime_nop(struct device *dev)
{
/* Runtime PM callback shared between ->runtime_suspend()
* and ->runtime_resume(). Simply returns success.
*
* This driver re-initializes all registers after
* pm_runtime_get_sync() anyway so there is no need
* to save and restore registers here.
*/
return 0;
}
static struct dev_pm_ops fsi_pm_ops = {
.runtime_suspend = fsi_runtime_nop,
.runtime_resume = fsi_runtime_nop,
};
static struct platform_driver fsi_driver = {
.driver = {
.name = "sh_fsi",
.pm = &fsi_pm_ops,
},
.probe = fsi_probe,
.remove = fsi_remove,