media: stm32-dcmi: add power saving support
Implements runtime & system sleep power management ops. Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hugues Fruchet
Mauro Carvalho Chehab
parent
f11552d030
commit
152e0bf602
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@ -22,7 +22,9 @@
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_graph.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/reset.h>
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#include <linux/videodev2.h>
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@ -567,9 +569,9 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
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u32 val = 0;
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int ret;
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ret = clk_enable(dcmi->mclk);
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ret = pm_runtime_get_sync(dcmi->dev);
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if (ret) {
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dev_err(dcmi->dev, "%s: Failed to start streaming, cannot enable clock\n",
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dev_err(dcmi->dev, "%s: Failed to start streaming, cannot get sync\n",
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__func__);
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goto err_release_buffers;
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}
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@ -579,7 +581,7 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
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if (ret && ret != -ENOIOCTLCMD) {
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dev_err(dcmi->dev, "%s: Failed to start streaming, subdev streamon error",
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__func__);
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goto err_disable_clock;
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goto err_pm_put;
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}
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spin_lock_irq(&dcmi->irqlock);
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@ -664,8 +666,8 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
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err_subdev_streamoff:
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v4l2_subdev_call(dcmi->entity.subdev, video, s_stream, 0);
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err_disable_clock:
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clk_disable(dcmi->mclk);
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err_pm_put:
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pm_runtime_put(dcmi->dev);
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err_release_buffers:
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spin_lock_irq(&dcmi->irqlock);
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@ -717,7 +719,7 @@ static void dcmi_stop_streaming(struct vb2_queue *vq)
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/* Stop all pending DMA operations */
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dmaengine_terminate_all(dcmi->dma_chan);
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clk_disable(dcmi->mclk);
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pm_runtime_put(dcmi->dev);
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if (dcmi->errors_count)
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dev_warn(dcmi->dev, "Some errors found while streaming: errors=%d (overrun=%d), buffers=%d\n",
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@ -1707,12 +1709,6 @@ static int dcmi_probe(struct platform_device *pdev)
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return -EPROBE_DEFER;
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}
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ret = clk_prepare(mclk);
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if (ret) {
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dev_err(&pdev->dev, "Unable to prepare mclk %p\n", mclk);
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goto err_dma_release;
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}
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spin_lock_init(&dcmi->irqlock);
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mutex_init(&dcmi->lock);
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init_completion(&dcmi->complete);
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@ -1728,7 +1724,7 @@ static int dcmi_probe(struct platform_device *pdev)
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/* Initialize the top-level structure */
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ret = v4l2_device_register(&pdev->dev, &dcmi->v4l2_dev);
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if (ret)
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goto err_clk_unprepare;
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goto err_dma_release;
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dcmi->vdev = video_device_alloc();
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if (!dcmi->vdev) {
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@ -1788,14 +1784,15 @@ static int dcmi_probe(struct platform_device *pdev)
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dev_info(&pdev->dev, "Probe done\n");
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platform_set_drvdata(pdev, dcmi);
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pm_runtime_enable(&pdev->dev);
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return 0;
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err_device_release:
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video_device_release(dcmi->vdev);
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err_device_unregister:
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v4l2_device_unregister(&dcmi->v4l2_dev);
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err_clk_unprepare:
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clk_unprepare(dcmi->mclk);
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err_dma_release:
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dma_release_channel(dcmi->dma_chan);
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@ -1806,20 +1803,72 @@ static int dcmi_remove(struct platform_device *pdev)
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{
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struct stm32_dcmi *dcmi = platform_get_drvdata(pdev);
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pm_runtime_disable(&pdev->dev);
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v4l2_async_notifier_unregister(&dcmi->notifier);
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v4l2_device_unregister(&dcmi->v4l2_dev);
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clk_unprepare(dcmi->mclk);
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dma_release_channel(dcmi->dma_chan);
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return 0;
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}
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static __maybe_unused int dcmi_runtime_suspend(struct device *dev)
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{
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struct stm32_dcmi *dcmi = dev_get_drvdata(dev);
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clk_disable_unprepare(dcmi->mclk);
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return 0;
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}
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static __maybe_unused int dcmi_runtime_resume(struct device *dev)
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{
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struct stm32_dcmi *dcmi = dev_get_drvdata(dev);
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int ret;
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ret = clk_prepare_enable(dcmi->mclk);
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if (ret)
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dev_err(dev, "%s: Failed to prepare_enable clock\n", __func__);
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return ret;
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}
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static __maybe_unused int dcmi_suspend(struct device *dev)
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{
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/* disable clock */
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pm_runtime_force_suspend(dev);
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/* change pinctrl state */
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pinctrl_pm_select_sleep_state(dev);
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return 0;
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}
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static __maybe_unused int dcmi_resume(struct device *dev)
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{
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/* restore pinctl default state */
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pinctrl_pm_select_default_state(dev);
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/* clock enable */
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pm_runtime_force_resume(dev);
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return 0;
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}
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static const struct dev_pm_ops dcmi_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(dcmi_suspend, dcmi_resume)
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SET_RUNTIME_PM_OPS(dcmi_runtime_suspend,
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dcmi_runtime_resume, NULL)
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};
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static struct platform_driver stm32_dcmi_driver = {
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.probe = dcmi_probe,
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.remove = dcmi_remove,
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.driver = {
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.name = DRV_NAME,
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.of_match_table = of_match_ptr(stm32_dcmi_of_match),
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.pm = &dcmi_pm_ops,
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},
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};
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