afc95681c3
In some cases the firmware expects cbndx 1 to be assigned to the GMU, so we also want the default domain for the GMU to be an identy domain. This way 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 later 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. Cc: stable@vger.kernel.org Signed-off-by: Rob Clark <robdclark@chromium.org> Tested-by: Johan Hovold <johan+linaro@kernel.org> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/20231210180655.75542-1-robdclark@gmail.com Signed-off-by: Will Deacon <will@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.