mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-04-29 05:52:38 -04:00
d8e53d8a4e
L2_MMU_CONFIG is an implementation-defined register. Different Mali GPUs define slightly different MAX_READS and MAX_WRITES fields, which throttle outstanding reads and writes when set to non-zero values. When left as zero, reads and writes are not throttled. Both kbase and panfrost always zero these registers. Per discussion with Steven Price, there are two reasons these quirks may be used: 1. Simulating slower memory subsystems. This use case is only of interest to system-on-chip designers; it is not relevant to mainline. 2. Working around broken memory subsystems. Hopefully we never see this case in mainline. If we do, we'll need to set this register based on an SoC-compatible, rather than generally matching on the GPU model. To the best of our knowledge, these fields are zero at reset, so the write is not necessary. Let's remove the write to aid porting to new Mali GPUs, which have different layouts for the L2_MMU_CONFIG register. Suggested-by: Steven Price <steven.price@arm.com> Reviewed-by: Steven Price <steven.price@arm.com> Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220525145754.25866-8-alyssa.rosenzweig@collabora.com
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.