On 5/26/2015 5:14 PM, Josh Wu wrote:
Hi, LaurentOn 5/26/2015 4:16 PM, Laurent Pinchart wrote:Hi Josh, Thank you for the patch. On Tuesday 26 May 2015 16:00:09 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...@atmel.com> --- 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() asisi 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 | 54 ++++++++++++++++++++----1 file changed, 46 insertions(+), 8 deletions(-) diff --git a/drivers/media/platform/soc_camera/atmel-isi.c b/drivers/media/platform/soc_camera/atmel-isi.c index 2879026..194e875 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> @@ -386,6 +387,8 @@ 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) {You need to call pm_runtime_put() in the error path, otherwise an atmel_isi_wait_status() failure will keep the device enabled.Nice catch. Thanks.I think it would simplify the code to move the configure_geometry() call to start_streaming() as you already call pm_runtime_get_sync() there. That can be@@ -445,6 +448,8 @@ 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 = {@@ -516,7 +521,13 @@ 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);done in a separate patch though.I think it's a good idea. I would like to make this in a separate patch and not include in this series.In summary, I'll resend this patch just with the fix you mentioned in above (fix the error path in start_streaming).Is that okay for you?
As I found another issue on stop_streaming(), so I sent a v5 series for this whole patch set with a new fix.
Please check it.BTW: I don't include the simplify method: move configure_geometry() into start_streaming(), I perfer do that after this series is merged.
Best Regards, Josh Wu
Best Regards, Josh Wu+ if (ret < 0) return ret; @@ -736,14 +747,9 @@ 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; } }@@ -758,7 +764,6 @@ 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)@@ -855,9 +860,14 @@ 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; } @@ -889,6 +899,7 @@ 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; } @@ -1027,8 +1038,6 @@ 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; @@ -1049,6 +1058,9 @@ 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; @@ -1062,6 +1074,7 @@ 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); @@ -1074,6 +1087,30 @@ 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" }, { }@@ -1085,6 +1122,7 @@ 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, }, };_______________________________________________ linux-arm-kernel mailing list linux-arm-ker...@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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