| Message ID | 1432634087-3356-3-git-send-email-josh.wu@atmel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Josh, Thank you for the patch. On Tuesday 26 May 2015 17:54:46 Josh Wu wrote: > The runtime pm resume/suspend will enable/disable pclk (ISI peripheral > clock). > And we need to call runtime_pm_get_sync()/runtime_pm_put() when we need > access ISI registers. In atmel_isi_probe(), remove the isi disable code > as in the moment ISI peripheral clock is not enable yet. > > In the meantime, as clock_start()/clock_stop() is used to control the > mclk not ISI peripheral clock. So move this to start[stop]_streaming() > function. > > Signed-off-by: Josh Wu <josh.wu@atmel.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > --- > > Changes in v5: > - fix the error path in start_streaming() thanks to Laurent. > > Changes in v4: > - need to call pm_runtime_disable() in atmel_isi_remove(). > - merged the patch which remove isi disable code in atmel_isi_probe() as > isi peripherial clock is not enabled in this moment. > - refine the commit log > > Changes in v3: None > Changes in v2: > - merged v1 two patch into one. > - use runtime_pm_put() instead of runtime_pm_put_sync() > - enable peripheral clock before access ISI registers. > > drivers/media/platform/soc_camera/atmel-isi.c | 55 ++++++++++++++++++++---- > 1 file changed, 47 insertions(+), 8 deletions(-) > > diff --git a/drivers/media/platform/soc_camera/atmel-isi.c > b/drivers/media/platform/soc_camera/atmel-isi.c index 2227022..0ea360a > 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> > @@ -386,10 +387,13 @@ static int start_streaming(struct vb2_queue *vq, > unsigned int count) struct atmel_isi *isi = ici->priv; > int ret; > > + pm_runtime_get_sync(ici->v4l2_dev.dev); > + > /* Reset ISI */ > ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET); > if (ret < 0) { > dev_err(icd->parent, "Reset ISI timed out\n"); > + pm_runtime_put(ici->v4l2_dev.dev); > return ret; > } > /* Disable all interrupts */ > @@ -443,6 +447,8 @@ static void stop_streaming(struct vb2_queue *vq) > ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE); > if (ret < 0) > dev_err(icd->parent, "Disable ISI timed out\n"); > + > + pm_runtime_put(ici->v4l2_dev.dev); > } > > static struct vb2_ops isi_video_qops = { > @@ -514,7 +520,13 @@ static int isi_camera_set_fmt(struct soc_camera_device > *icd, if (mf->code != xlate->code) > return -EINVAL; > > + /* Enable PM and peripheral clock before operate isi registers */ > + pm_runtime_get_sync(ici->v4l2_dev.dev); > + > ret = configure_geometry(isi, pix->width, pix->height, xlate->code); > + > + pm_runtime_put(ici->v4l2_dev.dev); > + > if (ret < 0) > return ret; > > @@ -734,14 +746,9 @@ static int isi_camera_clock_start(struct > soc_camera_host *ici) struct atmel_isi *isi = ici->priv; > int ret; > > - ret = clk_prepare_enable(isi->pclk); > - if (ret) > - return ret; > - > if (!IS_ERR(isi->mck)) { > ret = clk_prepare_enable(isi->mck); > if (ret) { > - clk_disable_unprepare(isi->pclk); > return ret; > } > } > @@ -756,7 +763,6 @@ static void isi_camera_clock_stop(struct soc_camera_host > *ici) > > if (!IS_ERR(isi->mck)) > clk_disable_unprepare(isi->mck); > - clk_disable_unprepare(isi->pclk); > } > > static unsigned int isi_camera_poll(struct file *file, poll_table *pt) > @@ -853,9 +859,14 @@ static int isi_camera_set_bus_param(struct > soc_camera_device *icd) > > cfg1 |= ISI_CFG1_THMASK_BEATS_16; > > + /* Enable PM and peripheral clock before operate isi registers */ > + pm_runtime_get_sync(ici->v4l2_dev.dev); > + > isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); > isi_writel(isi, ISI_CFG1, cfg1); > > + pm_runtime_put(ici->v4l2_dev.dev); > + > return 0; > } > > @@ -887,6 +898,7 @@ static int atmel_isi_remove(struct platform_device > *pdev) sizeof(struct fbd) * MAX_BUFFER_NUM, > isi->p_fb_descriptors, > isi->fb_descriptors_phys); > + pm_runtime_disable(&pdev->dev); > > return 0; > } > @@ -1025,8 +1037,6 @@ static int atmel_isi_probe(struct platform_device > *pdev) if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10) > isi->width_flags |= 1 << 9; > > - isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); > - > irq = platform_get_irq(pdev, 0); > if (IS_ERR_VALUE(irq)) { > ret = irq; > @@ -1047,6 +1057,9 @@ 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; > @@ -1060,6 +1073,7 @@ 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); > @@ -1072,6 +1086,30 @@ 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" }, > { } > @@ -1083,6 +1121,7 @@ static struct platform_driver atmel_isi_driver = { > .driver = { > .name = "atmel_isi", > .of_match_table = of_match_ptr(atmel_isi_of_match), > + .pm = &atmel_isi_dev_pm_ops, > }, > };
diff --git a/drivers/media/platform/soc_camera/atmel-isi.c b/drivers/media/platform/soc_camera/atmel-isi.c index 2227022..0ea360a 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> @@ -386,10 +387,13 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count) struct atmel_isi *isi = ici->priv; int ret; + pm_runtime_get_sync(ici->v4l2_dev.dev); + /* Reset ISI */ ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET); if (ret < 0) { dev_err(icd->parent, "Reset ISI timed out\n"); + pm_runtime_put(ici->v4l2_dev.dev); return ret; } /* Disable all interrupts */ @@ -443,6 +447,8 @@ static void stop_streaming(struct vb2_queue *vq) ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE); if (ret < 0) dev_err(icd->parent, "Disable ISI timed out\n"); + + pm_runtime_put(ici->v4l2_dev.dev); } static struct vb2_ops isi_video_qops = { @@ -514,7 +520,13 @@ static int isi_camera_set_fmt(struct soc_camera_device *icd, if (mf->code != xlate->code) return -EINVAL; + /* Enable PM and peripheral clock before operate isi registers */ + pm_runtime_get_sync(ici->v4l2_dev.dev); + ret = configure_geometry(isi, pix->width, pix->height, xlate->code); + + pm_runtime_put(ici->v4l2_dev.dev); + if (ret < 0) return ret; @@ -734,14 +746,9 @@ static int isi_camera_clock_start(struct soc_camera_host *ici) struct atmel_isi *isi = ici->priv; int ret; - ret = clk_prepare_enable(isi->pclk); - if (ret) - return ret; - if (!IS_ERR(isi->mck)) { ret = clk_prepare_enable(isi->mck); if (ret) { - clk_disable_unprepare(isi->pclk); return ret; } } @@ -756,7 +763,6 @@ static void isi_camera_clock_stop(struct soc_camera_host *ici) if (!IS_ERR(isi->mck)) clk_disable_unprepare(isi->mck); - clk_disable_unprepare(isi->pclk); } static unsigned int isi_camera_poll(struct file *file, poll_table *pt) @@ -853,9 +859,14 @@ static int isi_camera_set_bus_param(struct soc_camera_device *icd) cfg1 |= ISI_CFG1_THMASK_BEATS_16; + /* Enable PM and peripheral clock before operate isi registers */ + pm_runtime_get_sync(ici->v4l2_dev.dev); + isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); isi_writel(isi, ISI_CFG1, cfg1); + pm_runtime_put(ici->v4l2_dev.dev); + return 0; } @@ -887,6 +898,7 @@ static int atmel_isi_remove(struct platform_device *pdev) sizeof(struct fbd) * MAX_BUFFER_NUM, isi->p_fb_descriptors, isi->fb_descriptors_phys); + pm_runtime_disable(&pdev->dev); return 0; } @@ -1025,8 +1037,6 @@ static int atmel_isi_probe(struct platform_device *pdev) if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10) isi->width_flags |= 1 << 9; - isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); - irq = platform_get_irq(pdev, 0); if (IS_ERR_VALUE(irq)) { ret = irq; @@ -1047,6 +1057,9 @@ 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; @@ -1060,6 +1073,7 @@ 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); @@ -1072,6 +1086,30 @@ 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" }, { } @@ -1083,6 +1121,7 @@ static struct platform_driver atmel_isi_driver = { .driver = { .name = "atmel_isi", .of_match_table = of_match_ptr(atmel_isi_of_match), + .pm = &atmel_isi_dev_pm_ops, }, };
The runtime pm resume/suspend will enable/disable pclk (ISI peripheral clock). And we need to call runtime_pm_get_sync()/runtime_pm_put() when we need access ISI registers. In atmel_isi_probe(), remove the isi disable code as in the moment ISI peripheral clock is not enable yet. In the meantime, as clock_start()/clock_stop() is used to control the mclk not ISI peripheral clock. So move this to start[stop]_streaming() function. Signed-off-by: Josh Wu <josh.wu@atmel.com> --- Changes in v5: - fix the error path in start_streaming() thanks to Laurent. Changes in v4: - need to call pm_runtime_disable() in atmel_isi_remove(). - merged the patch which remove isi disable code in atmel_isi_probe() as isi peripherial clock is not enabled in this moment. - refine the commit log Changes in v3: None Changes in v2: - merged v1 two patch into one. - use runtime_pm_put() instead of runtime_pm_put_sync() - enable peripheral clock before access ISI registers. drivers/media/platform/soc_camera/atmel-isi.c | 55 +++++++++++++++++++++++---- 1 file changed, 47 insertions(+), 8 deletions(-)