Hello! Marek Szyprowski wrote: > If system provides IOMMU feature, Exynos DRM should use it by default, > because the Exynos DRM subdrivers don't work correctly when Exynos IOMMU > driver has been enabled and no IOMMU support has been compiled into Exynos > DRM driver. > > Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com> > --- > drivers/gpu/drm/exynos/Kconfig | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig > index 7f9f6f9e9b7e..39fe490efcd4 100644 > --- a/drivers/gpu/drm/exynos/Kconfig > +++ b/drivers/gpu/drm/exynos/Kconfig > @@ -13,10 +13,9 @@ config DRM_EXYNOS > If M is selected the module will be called exynosdrm. > > config DRM_EXYNOS_IOMMU > - bool "EXYNOS DRM IOMMU Support" > + bool > depends on DRM_EXYNOS && EXYNOS_IOMMU && ARM_DMA_USE_IOMMU > - help > - Choose this option if you want to use IOMMU feature for DRM. > + default y > > config DRM_EXYNOS_DMABUF > bool "EXYNOS DRM DMABUF" >
I tested Exynos DRM with the IOMMU enabled today and couldn't find any of the previous issues. A few things that I noticed though: 1) Without the IOMMU I get these powerdomain infos in the kernel logs: "lcd0-power-domain: Power-on latency exceeded, new value 416167 ns" "tv-power-domain: Power-on latency exceeded, new value 456125 ns" These don't appear with the IOMMU, so I was wondering if the powerdomains are now staying on the whole time? 2) With Exynos DRM now having a dependency on IOMMU (when it is enabled), I was wondering if anything needs to be done for the old 's5p-tv' driver to work properly now? With best wishes, Tobias
