diff options
Diffstat (limited to 'drivers/media/video/sh_mobile_ceu_camera.c')
| -rw-r--r-- | drivers/media/video/sh_mobile_ceu_camera.c | 46 |
1 files changed, 26 insertions, 20 deletions
diff --git a/drivers/media/video/sh_mobile_ceu_camera.c b/drivers/media/video/sh_mobile_ceu_camera.c index 0db88a53d92..61c47b82408 100644 --- a/drivers/media/video/sh_mobile_ceu_camera.c +++ b/drivers/media/video/sh_mobile_ceu_camera.c @@ -30,7 +30,7 @@ #include <linux/device.h> #include <linux/platform_device.h> #include <linux/videodev2.h> -#include <linux/clk.h> +#include <linux/pm_runtime.h> #include <media/v4l2-common.h> #include <media/v4l2-dev.h> @@ -86,7 +86,6 @@ struct sh_mobile_ceu_dev { unsigned int irq; void __iomem *base; - struct clk *clk; unsigned long video_limit; /* lock used to protect videobuf */ @@ -282,27 +281,24 @@ out: return ret; } +/* Called under spinlock_irqsave(&pcdev->lock, ...) */ static void sh_mobile_ceu_videobuf_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb) { struct soc_camera_device *icd = vq->priv_data; struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); struct sh_mobile_ceu_dev *pcdev = ici->priv; - unsigned long flags; dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__, vb, vb->baddr, vb->bsize); vb->state = VIDEOBUF_QUEUED; - spin_lock_irqsave(&pcdev->lock, flags); list_add_tail(&vb->queue, &pcdev->capture); if (!pcdev->active) { pcdev->active = vb; sh_mobile_ceu_capture(pcdev); } - - spin_unlock_irqrestore(&pcdev->lock, flags); } static void sh_mobile_ceu_videobuf_release(struct videobuf_queue *vq, @@ -364,7 +360,7 @@ static int sh_mobile_ceu_add_device(struct soc_camera_device *icd) if (ret) goto err; - clk_enable(pcdev->clk); + pm_runtime_get_sync(ici->dev); ceu_write(pcdev, CAPSR, 1 << 16); /* reset */ while (ceu_read(pcdev, CSTSR) & 1) @@ -398,7 +394,7 @@ static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd) } spin_unlock_irqrestore(&pcdev->lock, flags); - clk_disable(pcdev->clk); + pm_runtime_put_sync(ici->dev); icd->ops->release(icd); @@ -801,7 +797,6 @@ static int sh_mobile_ceu_probe(struct platform_device *pdev) struct sh_mobile_ceu_dev *pcdev; struct resource *res; void __iomem *base; - char clk_name[8]; unsigned int irq; int err = 0; @@ -865,13 +860,9 @@ static int sh_mobile_ceu_probe(struct platform_device *pdev) goto exit_release_mem; } - snprintf(clk_name, sizeof(clk_name), "ceu%d", pdev->id); - pcdev->clk = clk_get(&pdev->dev, clk_name); - if (IS_ERR(pcdev->clk)) { - dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name); - err = PTR_ERR(pcdev->clk); - goto exit_free_irq; - } + pm_suspend_ignore_children(&pdev->dev, true); + pm_runtime_enable(&pdev->dev); + pm_runtime_resume(&pdev->dev); pcdev->ici.priv = pcdev; pcdev->ici.dev = &pdev->dev; @@ -881,12 +872,10 @@ static int sh_mobile_ceu_probe(struct platform_device *pdev) err = soc_camera_host_register(&pcdev->ici); if (err) - goto exit_free_clk; + goto exit_free_irq; return 0; -exit_free_clk: - clk_put(pcdev->clk); exit_free_irq: free_irq(pcdev->irq, pcdev); exit_release_mem: @@ -907,7 +896,6 @@ static int sh_mobile_ceu_remove(struct platform_device *pdev) struct sh_mobile_ceu_dev, ici); soc_camera_host_unregister(soc_host); - clk_put(pcdev->clk); free_irq(pcdev->irq, pcdev); if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) dma_release_declared_memory(&pdev->dev); @@ -916,9 +904,27 @@ static int sh_mobile_ceu_remove(struct platform_device *pdev) return 0; } +static int sh_mobile_ceu_runtime_nop(struct device *dev) +{ + /* Runtime PM callback shared between ->runtime_suspend() + * and ->runtime_resume(). Simply returns success. + * + * This driver re-initializes all registers after + * pm_runtime_get_sync() anyway so there is no need + * to save and restore registers here. + */ + return 0; +} + +static struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = { + .runtime_suspend = sh_mobile_ceu_runtime_nop, + .runtime_resume = sh_mobile_ceu_runtime_nop, +}; + static struct platform_driver sh_mobile_ceu_driver = { .driver = { .name = "sh_mobile_ceu", + .pm = &sh_mobile_ceu_dev_pm_ops, }, .probe = sh_mobile_ceu_probe, .remove = sh_mobile_ceu_remove, |