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

Josh Wu
2015-03-05T05:01:00Z

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@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