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>

1 files changed, 25 insertions, 14 deletions

diff --git a/sound/soc/sh/fsi.c b/sound/soc/sh/fsi.c
index e1a3d1a2b4c8..9c49c11c43ce 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_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,