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>
diff --git a/sound/soc/sh/fsi.c b/sound/soc/sh/fsi.c
index e1a3d1a..9c49c11 100644
--- a/sound/soc/sh/fsi.c
+++ b/sound/soc/sh/fsi.c
@@ -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_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 @@
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 @@
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 @@
static int fsi_probe(struct platform_device *pdev)
{
struct resource *res;
- char clk_name[8];
unsigned int irq;
int ret;
@@ -903,14 +901,8 @@
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 @@
free_irq(irq, master);
exit_iounmap:
iounmap(master->base);
+ pm_runtime_disable(&pdev->dev);
exit_kfree:
kfree(master);
master = NULL;
@@ -947,7 +940,7 @@
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 @@
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,