ENGR00275974-3 [iMX6x] Add busfreq support to the drivers

Add request_bus_freq() and release_bus_freq() calls to the
various drivers to ensure that the DDR and AHB are the requested
frequency before the driver starts its task.

Signed-off-by: Ranjani Vaidyanathan <ra5478@freescale.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index 70df5a0caca7..49ab2bdc035c 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -10,6 +10,7 @@
  * kind, whether express or implied.
  */
 
+#include <linux/busfreq-imx6.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/module.h>
@@ -21,6 +22,7 @@
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
+#include <linux/pm_runtime.h>
 
 #include <sound/core.h>
 #include <sound/pcm.h>
@@ -330,6 +332,8 @@ static int fsl_ssi_startup(struct snd_pcm_substream *substream,
                 snd_soc_dai_get_drvdata(rtd->cpu_dai);
         int synchronous = ssi_private->cpu_dai_drv.symmetric_rates;
 
+        pm_runtime_get_sync(dai->dev);
+
         clk_enable(ssi_private->clk);
 
         /*
@@ -577,6 +581,8 @@ static void fsl_ssi_shutdown(struct snd_pcm_substream *substream,
 
         clk_disable(ssi_private->clk);
 
+        pm_runtime_put_sync(dai->dev);
+
         /* If this is the last active substream, disable the interrupts. */
         if (!ssi_private->first_stream) {
                 struct ccsr_ssi __iomem *ssi = ssi_private->ssi;
@@ -813,6 +819,8 @@ static int fsl_ssi_probe(struct platform_device *pdev)
                 goto error_irq;
         }
 
+        pm_runtime_enable(&pdev->dev);
+
         /* Register with ASoC */
         dev_set_drvdata(&pdev->dev, ssi_private);
 
@@ -918,6 +926,26 @@ static int fsl_ssi_remove(struct platform_device *pdev)
         return 0;
 }
 
+#ifdef CONFIG_PM_RUNTIME
+static int fsl_ssi_runtime_resume(struct device *dev)
+{
+        request_bus_freq(BUS_FREQ_AUDIO);
+        return 0;
+}
+
+static int fsl_ssi_runtime_suspend(struct device *dev)
+{
+        release_bus_freq(BUS_FREQ_AUDIO);
+        return 0;
+}
+
+static const struct dev_pm_ops fsl_ssi_pm = {
+        SET_RUNTIME_PM_OPS(fsl_ssi_runtime_suspend,
+                        fsl_ssi_runtime_resume,
+                        NULL)
+};
+#endif
+
 static const struct of_device_id fsl_ssi_ids[] = {
         { .compatible = "fsl,mpc8610-ssi", },
         { .compatible = "fsl,imx21-ssi", },