MLK-11429-7: ASoC: fsl_spdif: add pm runtime for spdif

cherry-pick below patch from imx_3.14.y
ENGR00331799-8: ASoC: fsl_spdif: add pm runtime for spdif

Add pm runtime for spdif.

Signed-off-by: Shengjiu Wang <b02247@freescale.com>
(cherry picked from commit 91136d03edf45355b6b0075a486f78f573c97c52)

diff --git a/sound/soc/fsl/fsl_spdif.c b/sound/soc/fsl/fsl_spdif.c
index 36752df..7dcb23a 100644 (file)
--- a/sound/soc/fsl/fsl_spdif.c
+++ b/sound/soc/fsl/fsl_spdif.c
@@ -20,6 +20,8 @@
 #include <linux/of_device.h>
 #include <linux/of_irq.h>
 #include <linux/regmap.h>
+#include <linux/pm_runtime.h>
+#include <linux/busfreq-imx.h>
 
 #include <sound/asoundef.h>
 #include <sound/dmaengine_pcm.h>
@@ -454,6 +456,8 @@ static int fsl_spdif_startup(struct snd_pcm_substream *substream,
        int i;
        int ret;
 
+       pm_runtime_get_sync(cpu_dai->dev);
+
        /* Reset module and interrupts only for first initialization */
        if (!cpu_dai->active) {
                ret = clk_prepare_enable(spdif_priv->coreclk);
@@ -551,6 +555,8 @@ static void fsl_spdif_shutdown(struct snd_pcm_substream *substream,
                        clk_disable_unprepare(spdif_priv->spbaclk);
                clk_disable_unprepare(spdif_priv->coreclk);
        }
+
+       pm_runtime_put_sync(cpu_dai->dev);
 }
 
 static int fsl_spdif_hw_params(struct snd_pcm_substream *substream,
@@ -1296,6 +1302,8 @@ static int fsl_spdif_probe(struct platform_device *pdev)
        spdif_priv->dma_params_tx.addr = res->start + REG_SPDIF_STL;
        spdif_priv->dma_params_rx.addr = res->start + REG_SPDIF_SRL;
 
+       pm_runtime_enable(&pdev->dev);
+
        /* Register with ASoC */
        dev_set_drvdata(&pdev->dev, spdif_priv);
 
@@ -1344,8 +1352,24 @@ static int fsl_spdif_resume(struct device *dev)
 }
 #endif /* CONFIG_PM_SLEEP */
 
+#ifdef CONFIG_PM
+static int fsl_spdif_runtime_resume(struct device *dev)
+{
+       request_bus_freq(BUS_FREQ_HIGH);
+       return 0;
+}
+
+static int fsl_spdif_runtime_suspend(struct device *dev)
+{
+       release_bus_freq(BUS_FREQ_HIGH);
+       return 0;
+}
+#endif
+
 static const struct dev_pm_ops fsl_spdif_pm = {
        SET_SYSTEM_SLEEP_PM_OPS(fsl_spdif_suspend, fsl_spdif_resume)
+       SET_RUNTIME_PM_OPS(fsl_spdif_runtime_suspend, fsl_spdif_runtime_resume,
+                          NULL)
 };
 
 static const struct of_device_id fsl_spdif_dt_ids[] = {