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SubjectRe: [PATCH] drm/komeda: Adds power management support
Hi Lowry,

On Mon, Jun 17, 2019 at 06:55:49AM +0100, Lowry Li (Arm Technology China) wrote:
> Adds runtime and system power management support in KMS kernel driver.
>
> Depends on:
> - https://patchwork.freedesktop.org/series/61650/
> - https://patchwork.freedesktop.org/series/60083/
>
> Signed-off-by: Lowry Li (Arm Technology China) <lowry.li@arm.com>
> ---
> drivers/gpu/drm/arm/display/komeda/komeda_crtc.c | 2 +
> drivers/gpu/drm/arm/display/komeda/komeda_dev.c | 30 +++++++++++++
> drivers/gpu/drm/arm/display/komeda/komeda_dev.h | 2 +
> drivers/gpu/drm/arm/display/komeda/komeda_drv.c | 54 ++++++++++++++++++++++--
> 4 files changed, 85 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> index 66c5e0d..1b4ea8a 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> @@ -257,6 +257,7 @@ void komeda_crtc_handle_event(struct komeda_crtc *kcrtc,
> komeda_crtc_atomic_enable(struct drm_crtc *crtc,
> struct drm_crtc_state *old)
> {
> + pm_runtime_get_sync(crtc->dev->dev);
> komeda_crtc_prepare(to_kcrtc(crtc));
> drm_crtc_vblank_on(crtc);
> komeda_crtc_do_flush(crtc, old);
> @@ -330,6 +331,7 @@ void komeda_crtc_handle_event(struct komeda_crtc *kcrtc,
>
> drm_crtc_vblank_off(crtc);
> komeda_crtc_unprepare(kcrtc);
> + pm_runtime_put(crtc->dev->dev);
> }
>
> static void
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
> index 405c64d..edd0943 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
> @@ -308,3 +308,33 @@ void komeda_dev_destroy(struct komeda_dev *mdev)
>
> devm_kfree(dev, mdev);
> }
> +
> +int komeda_dev_resume(struct komeda_dev *mdev)
> +{
> + int ret = 0;
> +
> + if (mdev->iommu && mdev->funcs->connect_iommu) {
> + ret = mdev->funcs->connect_iommu(mdev);
> + if (ret < 0) {
> + DRM_ERROR("connect iommu failed.\n");
> + return ret;
> + }
> + }
> +
> + return mdev->funcs->enable_irq(mdev);
> +}
> +
> +int komeda_dev_suspend(struct komeda_dev *mdev)
> +{
> + int ret = 0;
> +
> + if (mdev->iommu && mdev->funcs->disconnect_iommu) {
> + ret = mdev->funcs->disconnect_iommu(mdev);
> + if (ret < 0) {
> + DRM_ERROR("disconnect iommu failed.\n");
> + return ret;
> + }
> + }
> +
> + return mdev->funcs->disable_irq(mdev);
> +}
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.h b/drivers/gpu/drm/arm/display/komeda/komeda_dev.h
> index d1c86b6..096f9f7 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.h
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.h
> @@ -207,4 +207,6 @@ struct komeda_dev {
>
> struct komeda_dev *dev_to_mdev(struct device *dev);
>
> +int komeda_dev_resume(struct komeda_dev *mdev);
> +int komeda_dev_suspend(struct komeda_dev *mdev);
> #endif /*_KOMEDA_DEV_H_*/
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
> index cfa5068..aa4cef1 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
> @@ -8,6 +8,7 @@
> #include <linux/kernel.h>
> #include <linux/platform_device.h>
> #include <linux/component.h>
> +#include <linux/pm_runtime.h>
> #include <drm/drm_of.h>
> #include "komeda_dev.h"
> #include "komeda_kms.h"
> @@ -32,6 +33,9 @@ static void komeda_unbind(struct device *dev)
> return;
>
> komeda_kms_detach(mdrv->kms);
> +
> + pm_runtime_disable(dev);
> +
> komeda_dev_destroy(mdrv->mdev);
>
> dev_set_drvdata(dev, NULL);
> @@ -52,6 +56,9 @@ static int komeda_bind(struct device *dev)
> err = PTR_ERR(mdrv->mdev);
> goto free_mdrv;
> }
> + dev_set_drvdata(dev, mdrv);
> +
> + pm_runtime_enable(dev);
>
> mdrv->kms = komeda_kms_attach(mdrv->mdev);
> if (IS_ERR(mdrv->kms)) {
> @@ -59,11 +66,10 @@ static int komeda_bind(struct device *dev)
> goto destroy_mdev;
> }
>
> - dev_set_drvdata(dev, mdrv);
> -
> return 0;
>
> destroy_mdev:
> + pm_runtime_disable(dev);
> komeda_dev_destroy(mdrv->mdev);
>
> free_mdrv:
> @@ -134,13 +140,55 @@ static int komeda_platform_remove(struct platform_device *pdev)
>
> MODULE_DEVICE_TABLE(of, komeda_of_match);
>
> +static int komeda_rt_pm_suspend(struct device *dev)
> +{
> + dev_info(dev, "%s\n", __func__);
> + return 0;
> +}
> +
> +static int komeda_rt_pm_resume(struct device *dev)
> +{
> + dev_info(dev, "%s\n", __func__);
> + return 0;
> +}


Useful only for debugging? I think you've missed an opportunity here to turn
off clocks and disable interrupts.

> +
> +static int __maybe_unused komeda_pm_suspend(struct device *dev)
> +{
> + struct komeda_drv *mdrv = dev_get_drvdata(dev);
> + struct drm_device *drm = &mdrv->kms->base;
> + int res;
> +
> + dev_info(dev, "%s\n", __func__);
> + res = drm_mode_config_helper_suspend(drm);
> +
> + komeda_dev_suspend(mdrv->mdev);
> +
> + return res;
> +}
> +
> +static int __maybe_unused komeda_pm_resume(struct device *dev)
> +{
> + struct komeda_drv *mdrv = dev_get_drvdata(dev);
> + struct drm_device *drm = &mdrv->kms->base;
> +
> + dev_info(dev, "%s\n", __func__);

I don't see the point of printing all these message on suspend/resume. Please
convert them to DRM_DEBUG() if you want to have some sort of notices in the
kernel log, otherwise please remove them.

Best regards,
Liviu


> + komeda_dev_resume(mdrv->mdev);
> +
> + return drm_mode_config_helper_resume(drm);
> +}
> +
> +static const struct dev_pm_ops komeda_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(komeda_pm_suspend, komeda_pm_resume)
> + SET_RUNTIME_PM_OPS(komeda_rt_pm_suspend, komeda_rt_pm_resume, NULL)
> +};
> +
> static struct platform_driver komeda_platform_driver = {
> .probe = komeda_platform_probe,
> .remove = komeda_platform_remove,
> .driver = {
> .name = "komeda",
> .of_match_table = komeda_of_match,
> - .pm = NULL,
> + .pm = &komeda_pm_ops,
> },
> };
>
> --
> 1.9.1
>

--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯

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