[PATCH 2/3] media: atmel-isi: add runtime pm support

[Josh Wu]

The runtime pm resume/suspend will enable/disable pclk (ISI peripheral
clock).
And we need to call rumtime_pm_get/put_sync function to make pm
resume/suspend.

Signed-off-by: Josh Wu <josh.wu at atmel.com>
---

 drivers/media/platform/soc_camera/atmel-isi.c | 36 ++++++++++++++++++++++++---
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/soc_camera/atmel-isi.c b/drivers/media/platform/soc_camera/atmel-isi.c
index eb179e7..4a384f1 100644
--- a/drivers/media/platform/soc_camera/atmel-isi.c
+++ b/drivers/media/platform/soc_camera/atmel-isi.c
@@ -20,6 +20,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/slab.h>
 
 #include <media/atmel-isi.h>
@@ -386,9 +387,7 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
 	struct atmel_isi *isi = ici->priv;
 	int ret;
 
-	ret = clk_prepare_enable(isi->pclk);
-	if (ret)
-		return ret;
+	pm_runtime_get_sync(ici->v4l2_dev.dev);
 
 	/* Reset ISI */
 	ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
@@ -450,7 +449,7 @@ static void stop_streaming(struct vb2_queue *vq)
 	if (ret < 0)
 		dev_err(icd->parent, "Disable ISI timed out\n");
 
-	clk_disable_unprepare(isi->pclk);
+	pm_runtime_put_sync(ici->v4l2_dev.dev);
 }
 
 static struct vb2_ops isi_video_qops = {
@@ -1042,6 +1041,9 @@ static int atmel_isi_probe(struct platform_device *pdev)
 	soc_host->v4l2_dev.dev	= &pdev->dev;
 	soc_host->nr		= pdev->id;
 
+	pm_suspend_ignore_children(&pdev->dev, true);
+	pm_runtime_enable(&pdev->dev);
+
 	if (isi->pdata.asd_sizes) {
 		soc_host->asd = isi->pdata.asd;
 		soc_host->asd_sizes = isi->pdata.asd_sizes;
@@ -1055,6 +1057,7 @@ static int atmel_isi_probe(struct platform_device *pdev)
 	return 0;
 
 err_register_soc_camera_host:
+	pm_runtime_disable(&pdev->dev);
 err_req_irq:
 err_ioremap:
 	vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
@@ -1067,6 +1070,30 @@ err_alloc_ctx:
 	return ret;
 }
 
+static int atmel_isi_runtime_suspend(struct device *dev)
+{
+	struct soc_camera_host *soc_host = to_soc_camera_host(dev);
+	struct atmel_isi *isi = container_of(soc_host,
+					struct atmel_isi, soc_host);
+
+	clk_disable_unprepare(isi->pclk);
+
+	return 0;
+}
+static int atmel_isi_runtime_resume(struct device *dev)
+{
+	struct soc_camera_host *soc_host = to_soc_camera_host(dev);
+	struct atmel_isi *isi = container_of(soc_host,
+					struct atmel_isi, soc_host);
+
+	return clk_prepare_enable(isi->pclk);
+}
+
+static const struct dev_pm_ops atmel_isi_dev_pm_ops = {
+	SET_RUNTIME_PM_OPS(atmel_isi_runtime_suspend,
+				atmel_isi_runtime_resume, NULL)
+};
+
 static const struct of_device_id atmel_isi_of_match[] = {
 	{ .compatible = "atmel,at91sam9g45-isi" },
 	{ }
@@ -1079,6 +1106,7 @@ static struct platform_driver atmel_isi_driver = {
 		.name = "atmel_isi",
 		.owner = THIS_MODULE,
 		.of_match_table = of_match_ptr(atmel_isi_of_match),
+		.pm	= &atmel_isi_dev_pm_ops,
 	},
 };
 
-- 
1.9.1