On Thu, Dec 07, 2023 at 01:24:39PM -0800, Rob Clark wrote: > From: Rob Clark <robdclark@xxxxxxxxxxxx> > > We also want the default domain for the GMU to be an identy domain, > so it does not get a context bank assigned. Without this, both > of_dma_configure() and drm/msm's iommu_domain_attach() will trigger > allocating and configuring a context bank. So GMU ends up attached > to both cbndx 1 and cbndx 2. This arrangement seemingly confounds > and surprises the firmware if the GPU later triggers a translation > fault, resulting (on sc8280xp / lenovo x13s, at least) in the SMMU > getting wedged and the GPU stuck without memory access. This sounds like something that should be backported. Should you add a Fixes and CC-stable tag? > Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx> Johan
