Putting a hard dependency on CONFIG_PM is not possible because of a circular dependency issue, and it's actually not desirable either. In order to support this use case, we forcibly resume at init time, and suspend at unplug time.
Reported-by: kernel test robot <[email protected]> Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ Signed-off-by: Boris Brezillon <[email protected]> --- Tested by faking CONFIG_PM=n in the driver (basically commenting all pm_runtime calls, and making the panthor_device_suspend/resume() calls unconditional in the panthor_device_unplug/init() path) since CONFIG_ARCH_ROCKCHIP selects CONFIG_PM. Seems to work fine, but I can't be 100% sure this will work correctly on a platform that has CONFIG_PM=n. --- drivers/gpu/drm/panthor/panthor_device.c | 13 +++++++++++-- drivers/gpu/drm/panthor/panthor_drv.c | 4 +++- 2 files changed, 14 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/panthor/panthor_device.c index 69deb8e17778..ba7aedbb4931 100644 --- a/drivers/gpu/drm/panthor/panthor_device.c +++ b/drivers/gpu/drm/panthor/panthor_device.c @@ -87,6 +87,10 @@ void panthor_device_unplug(struct panthor_device *ptdev) pm_runtime_dont_use_autosuspend(ptdev->base.dev); pm_runtime_put_sync_suspend(ptdev->base.dev); + /* If PM is disabled, we need to call the suspend handler manually. */ + if (!IS_ENABLED(CONFIG_PM)) + panthor_device_suspend(ptdev->base.dev); + /* Report the unplug operation as done to unblock concurrent * panthor_device_unplug() callers. */ @@ -218,6 +222,13 @@ int panthor_device_init(struct panthor_device *ptdev) if (ret) return ret; + /* If PM is disabled, we need to call panthor_device_resume() manually. */ + if (!IS_ENABLED(CONFIG_PM)) { + ret = panthor_device_resume(ptdev->base.dev); + if (ret) + return ret; + } + ret = panthor_gpu_init(ptdev); if (ret) goto err_rpm_put; @@ -402,7 +413,6 @@ int panthor_device_mmap_io(struct panthor_device *ptdev, struct vm_area_struct * return 0; } -#ifdef CONFIG_PM int panthor_device_resume(struct device *dev) { struct panthor_device *ptdev = dev_get_drvdata(dev); @@ -547,4 +557,3 @@ int panthor_device_suspend(struct device *dev) mutex_unlock(&ptdev->pm.mmio_lock); return ret; } -#endif diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c index ff484506229f..2ea6a9f436db 100644 --- a/drivers/gpu/drm/panthor/panthor_drv.c +++ b/drivers/gpu/drm/panthor/panthor_drv.c @@ -1407,17 +1407,19 @@ static const struct of_device_id dt_match[] = { }; MODULE_DEVICE_TABLE(of, dt_match); +#ifdef CONFIG_PM static DEFINE_RUNTIME_DEV_PM_OPS(panthor_pm_ops, panthor_device_suspend, panthor_device_resume, NULL); +#endif static struct platform_driver panthor_driver = { .probe = panthor_probe, .remove_new = panthor_remove, .driver = { .name = "panthor", - .pm = &panthor_pm_ops, + .pm = pm_ptr(&panthor_pm_ops), .of_match_table = dt_match, }, }; -- 2.43.0
