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Richard Fitzgerald 900baa6e7b
firmware: cs_dsp: Remove redundant download buffer allocator 
Now that cs_dsp uses regmap_raw_write() instead of regmap_raw_write_async()
it doesn't need to keep multiple DMA-safe buffers of every chunk of data
it wrote.

See commit fe08b7d508 ("firmware: cs_dsp: Remove async regmap writes")

Only one write can be in progress at a time, so one DMA-safe buffer can be
re-used. The single DMA-safe buffer is reallocated if the next write chunk
is larger. Reallocation size is rounded up to reduce the amount of churn.
PAGE_SIZE is used as a convenient size multiple. Typically for .wmfw files
the first chunk is the largest.

A DMA-safe intermediate buffer is used because we can't assume that the
bus underlying regmap can accept non-DMA-safe buffers.

Note that a chunk from the firmware file cannot simply be split into
arbitrarily-sized chunks to avoid buffer reallocation. The data in the
firmware file is preformatted to be written directly to the device as one
block. It already takes account of alignment, write-bursts and write
length requirements of the target hardware, so that the cs_dsp driver can
treat it as an opaque blob.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://patch.msgid.link/20251126131501.884188-1-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2025-11-26 17:41:26 +00:00
arch 7 hotfixes. 5 are cc:stable, 4 are against mm/. 2025-11-16 13:31:14 -08:00
block block-6.18-20251031 2025-10-31 12:57:19 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto This push contains the following changes: 2025-10-10 08:56:16 -07:00
Documentation ASoC: dt-bindings: ti,tas2781: Add TAS2568/2574/5806M/5806MD/5830 support 2025-11-20 13:12:26 +00:00
drivers firmware: cs_dsp: Remove redundant download buffer allocator 2025-11-26 17:41:26 +00:00
fs More NFS Client Bugfixes for Linux 6.18-rc 2025-11-14 13:44:23 -08:00
include firmware: cs_dsp: Store control length as 32-bit 2025-11-24 19:15:19 +00:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring/rsrc: don't use blk_rq_nr_phys_segments() as number of bvecs 2025-11-12 08:25:33 -07:00
ipc namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
kernel 7 hotfixes. 5 are cc:stable, 4 are against mm/. 2025-11-16 13:31:14 -08:00
lib gpio: improve support for shared GPIOs 2025-11-20 12:39:38 +00:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm 7 hotfixes. 5 are cc:stable, 4 are against mm/. 2025-11-16 13:31:14 -08:00
net bpf-fixes 2025-11-14 15:39:39 -08:00
rust rust: Add -fno-isolate-erroneous-paths-dereference to bindgen_skip_c_flags 2025-11-10 08:37:06 +08:00
samples Char/Misc/IIO/Binder changes for 6.18-rc1 2025-10-04 16:26:32 -07:00
scripts Rust fixes for v6.18 (2nd) 2025-11-14 15:36:15 -08:00
security integrity-v6.18 2025-10-05 10:48:33 -07:00
sound ASoC: tegra: remove Kconfig dependency on TEGRA20_APB_DMA 2025-11-26 13:03:05 +00:00
tools perf tools fixes for v6.18: 2nd batch 2025-11-16 13:45:03 -08:00
usr gen_init_cpio: Ignore fsync() returning EINVAL on pipes 2025-10-07 09:53:05 -07:00
virt KVM: guest_memfd: Remove bindings on memslot deletion when gmem is dying 2025-11-04 09:16:53 -08:00
.clang-format memblock: drop for_each_free_mem_pfn_range_in_zone_from() 2025-09-14 08:49:03 +03:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore compile_commands.json globally 2025-08-12 15:53:55 -07:00
.mailmap 7 hotfixes. 5 are cc:stable, 4 are against mm/. 2025-11-16 13:31:14 -08:00
.pylintrc tools: docs: parse-headers.py: move it from sphinx dir 2025-08-29 15:54:42 -06:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: mark ISDN subsystem as orphan 2025-10-27 17:49:45 -07:00
Kbuild sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS ASoC: Intel: avs: Allow for NHLT configuration 2025-11-18 11:37:11 +00:00
Makefile Linux 6.18-rc6 2025-11-16 14:25:38 -08:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

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 reStructuredText 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.