In the current code, exynos_drm_suspend() function is called after all real devices (CRTCs, Encoders, etc) are suspended, because Exynos DRM virtual platform device is created as last device in the system (as a part of DRM registration). None of the devices for real hardware modules has its own system suspend/resume callbacks, so it doesn't change any order of the executed code, but it has a side-effect: runtime PM callbacks for real devices are not executed, because those devices are considered by PM core as already suspended. This might cause issues on boards with complex pipelines, where something depends on the runtime PM state of the given device.
To ensure that exynos_drm_suspend() is called before any suspend callback from the real devices, assign it to .prepare callback. Same for exynos_drm_resume(), using .complete callback ensures that all real devices have been resumed when calling it.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com --- drivers/gpu/drm/exynos/exynos_drm_drv.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c index c0b4a03ae1b6..d98bc15d490d 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c @@ -147,7 +147,6 @@ static struct drm_driver exynos_drm_driver = { .minor = DRIVER_MINOR, };
-#ifdef CONFIG_PM_SLEEP static int exynos_drm_suspend(struct device *dev) { struct drm_device *drm_dev = dev_get_drvdata(dev); @@ -170,7 +169,7 @@ static int exynos_drm_suspend(struct device *dev) return 0; }
-static int exynos_drm_resume(struct device *dev) +static void exynos_drm_resume(struct device *dev) { struct drm_device *drm_dev = dev_get_drvdata(dev); struct exynos_drm_private *private; @@ -182,13 +181,11 @@ static int exynos_drm_resume(struct device *dev) drm_atomic_helper_resume(drm_dev, private->suspend_state); exynos_drm_fbdev_resume(drm_dev); drm_kms_helper_poll_enable(drm_dev); - - return 0; } -#endif
static const struct dev_pm_ops exynos_drm_pm_ops = { - SET_SYSTEM_SLEEP_PM_OPS(exynos_drm_suspend, exynos_drm_resume) + .prepare = exynos_drm_suspend, + .complete = exynos_drm_resume, };
/* forward declaration */