On Wed, Jul 15, 2020 at 10:22:13AM +0800, Chen-Yu Tsai wrote: > Hi Greg, > > On Wed, Jul 15, 2020 at 3:11 AM Greg Kroah-Hartman > <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > > > From: Maxime Ripard <maxime@xxxxxxxxxx> > > > > [ Upstream commit 842ec61f4006a6477a9deaedd69131e9f46e4cb5 ] > > > > The main DRM device is actually a virtual device so it doesn't have the > > iommus property, which is instead on the DMA masters, in this case the > > mixers. > > The iommu driver and DT changes were added in v5.8-rc1. IMO There is no > point in backporting this patch to any stable kernel. Now dropped from everywhere, thanks. greg k-h