Hi Josh, Thank you for the patch. On Thursday 05 March 2015 13:01:00 Josh Wu wrote: > 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@xxxxxxxxx> > --- > > 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); Is there a reason to use pm_runtime_put_sync() and not just pm_runtime_put() ? > } > > 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, > }, > }; -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html