Runtime power management is essential for the Exynos Mixer driver operation. It should be enabled before adding its DRM component, because in some cases (when deferred probe takes place due to the IOMMU availability) the DRM driver might be initialized directly from the Mixer's component_add() call, what results in starting the driver operation without enabling the runtime power management.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com --- drivers/gpu/drm/exynos/exynos_mixer.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c index ffbf4a950f69..829d2ce7560d 100644 --- a/drivers/gpu/drm/exynos/exynos_mixer.c +++ b/drivers/gpu/drm/exynos/exynos_mixer.c @@ -1200,9 +1200,11 @@ static int mixer_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, ctx);
+ pm_runtime_enable(dev); + ret = component_add(&pdev->dev, &mixer_component_ops); - if (!ret) - pm_runtime_enable(dev); + if (ret) + pm_runtime_disable(dev);
return ret; }