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Niklas Cassel 7edbb60592 ahci: clean up intel_pcs_quirk 
The comment in front of board_ahci_pcs7 is completely wrong.
It claims that board_ahci_pcs7 is needing the quirk, but in fact,
the logic implemented in ahci_intel_pcs_quirk() is the exact opposite,
only board_ahci_pcs7 is _excluded_ from the quirk.

This way of implementing a quirk is unconventional in several ways:
First of all because it has a board ID for which the quirk should _not_ be
applied (board_ahci_pcs7), instead of the usual way where we have a board
ID for which the quirk should be applied.

The second reason is that other than only excluding board_ahci_pcs7 from
the quirk, PCI devices that make use of the generic entry in ahci_pci_tbl
(which matches on AHCI class code) are also excluded.

This can of course lead to very subtle breakage, and did indeed do so in:
commit 104ff59af7 ("ata: ahci: Add Tiger Lake UP{3,4} AHCI controller"),
which added an explicit entry with board_ahci_low_power to ahci_pci_tbl.

This caused many users to complain that their SATA drives disappeared.
The logical assumption was of course that the issue was related to LPM,
and was therefore reverted in commit 6210038aea ("ata: ahci: Revert
"ata: ahci: Add Tiger Lake UP{3,4} AHCI controller"").

It took a lot of time to figure out that this was all completely unrelated
to LPM, and was instead caused by an unconventional Intel quirk.

Clean up the quirk so that it behaves like other quirks, i.e. define a
board where the quirk is applied. Platforms that were using
board_ahci_pcs7 are converted to use board_ahci, this is safe since the
boards were identical, and board_ahci_pcs7 did not define any custom
port_ops.

This way, new Intel platforms can be added using the correct "board_ahci"
board, without getting any unexpected quirks applied.

This means that we currently have some modern platforms defined that are
using the Intel PCS quirk, but that is identical to the behavior that
was there before this commit.

No functional changes intended.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=217114
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Niklas Cassel <cassel@kernel.org>
History 2024-02-13 11:31:14 +01:00
arch IOMMU Fixes for Linux v6.8-rc2 2024-02-02 12:43:51 -08:00
block block: Fix where bio IO priority gets set 2024-02-01 11:00:06 -07:00
certs This update includes the following changes: 2023-11-02 16:15:30 -10:00
crypto crypto: scomp - fix req->dst buffer overflow 2023-12-29 11:25:56 +08:00
Documentation dt-bindings: ata: atmel: remove at91 compact flash documentation 2024-02-06 10:53:47 +01:00
drivers ahci: clean up intel_pcs_quirk 2024-02-13 11:31:14 +01:00
fs Miscellaneous bug fixes and cleanups in ext4's multi-block allocator 2024-02-04 07:33:01 +00:00
include Miscellaneous bug fixes and cleanups in ext4's multi-block allocator 2024-02-04 07:33:01 +00:00
init Kconfig: Disable -Wstringop-overflow for GCC globally 2024-02-01 14:57:17 -08:00
io_uring io_uring/net: fix sr->len for IORING_OP_RECV with MSG_WAITALL and buffers 2024-02-01 06:42:36 -07:00
ipc shm: Slim down dependencies 2023-12-20 19:26:31 -05:00
kernel Tracing and eventfs fixes for v6.8: 2024-02-02 15:32:58 -08:00
lib linux_kselftest-kunit-fixes-6.8-rc3 2024-01-30 15:12:58 -08:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm 22 hotfixes. 11 are cc:stable and the remainder address post-6.7 issues 2024-01-29 17:12:16 -08:00
net Including fixes from netfilter. 2024-02-01 12:39:54 -08:00
rust Rust changes for v6.8 2024-01-11 13:05:41 -08:00
samples samples/cgroup: add .gitignore file for generated samples 2024-01-24 11:52:40 -08:00
scripts Kbuild fixes for v6.8 2024-02-01 11:57:42 -08:00
security lsm/stable-6.8 PR 20240131 2024-02-01 10:00:28 -08:00
sound ASoC: Fixes for v6.8 2024-02-01 19:40:42 +01:00
tools perf tools fixes for v6.8: 2024-02-03 12:52:36 +00:00
usr Kbuild updates for v6.8 2024-01-18 17:57:07 -08:00
virt Generic: 2024-01-17 13:03:37 -08:00
.clang-format clang-format: Update with v6.7-rc4's for_each macro list 2023-12-08 23:54:38 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig Add .editorconfig file for basic formatting 2023-12-28 16:22:47 +09:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Add .editorconfig file for basic formatting 2023-12-28 16:22:47 +09:00
.mailmap Char/Misc and other Driver changes for 6.8-rc1 2024-01-17 16:47:17 -08:00
.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: supplement of zswap maintainers update 2024-01-25 23:52:21 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS update to point people to the new tree for i2c host driver 2024-02-04 06:47:45 +00:00
Makefile Linux 6.8-rc3 2024-02-04 12:20:36 +00:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -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 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.