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Marek Vasut 95f29bada0 clk: renesas: cpg-mssr: Read back reset registers to assure values latched 
[ Upstream commit b91401af6c ]

On R-Car V4H, the PCIEC controller DBI read would generate an SError in
case the controller reset is released by writing SRSTCLR register first,
and immediately afterward reading some PCIEC controller DBI register.
The issue triggers in rcar_gen4_pcie_additional_common_init() on
dw_pcie_readl_dbi(dw, PCIE_PORT_LANE_SKEW), which on V4H is the first
read after reset_control_deassert(dw->core_rsts[DW_PCIE_PWR_RST].rstc).

The reset controller which contains the SRSTCLR register and the PCIEC
controller which contains the DBI register share the same root access
bus, but the bus then splits into separate segments before reaching each
IP.  Even if the SRSTCLR write access was posted on the bus before the
DBI read access, it seems the DBI read access may reach the PCIEC
controller before the SRSTCLR write completed, and trigger the SError.

Mitigate the issue by adding a dummy SRSTCLR read, which assures the
SRSTCLR write completes fully and is latched into the reset controller,
before the PCIEC DBI read access can occur.

Fixes: 0ab55cf183 ("clk: renesas: cpg-mssr: Add support for R-Car V4H")
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20250922162113.113223-1-marek.vasut+renesas@mailbox.org
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-12-18 13:54:41 +01:00
arch LoongArch: Mask all interrupts during kexec/kdump 2025-12-12 18:37:21 +01:00
block blk-crypto: use BLK_STS_INVAL for alignment errors 2025-12-01 11:43:36 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: essiv - Check ssize for decryption and in-place encryption 2025-10-19 16:33:42 +02:00
Documentation smack: fix bug: setting task label silently ignores input garbage 2025-12-18 13:54:40 +01:00
drivers clk: renesas: cpg-mssr: Read back reset registers to assure values latched 2025-12-18 13:54:41 +01:00
fs bfs: Reconstruct file type when loading from disk 2025-12-12 18:37:20 +01:00
include Revert "xfrm: destroy xfrm_state synchronously on net exit path" 2025-12-12 18:37:17 +01:00
init init: handle bootloader identifier in kernel parameters 2025-10-19 16:33:50 +02:00
io_uring io_uring/napi: fix io_napi_entry RCU accesses 2025-11-24 10:36:06 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel ftrace: bpf: Fix IPMODIFY + DIRECT in modify_ftrace_direct() 2025-12-12 18:37:19 +01:00
lib maple_tree: fix tracepoint string pointers 2025-12-01 11:43:39 +01:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/huge_memory: fix NULL pointer deference when splitting folio 2025-12-07 06:25:02 +09:00
net xfrm: flush all states in xfrm_state_fini 2025-12-12 18:37:17 +01:00
rust rust: kbuild: workaround rustdoc doctests modifier bug 2025-11-24 10:36:07 +01:00
samples samples: work around glibc redefining some of our defines wrong 2025-12-12 18:37:21 +01:00
scripts kconfig/nconf: Initialize the default locale at startup 2025-12-01 11:43:36 +01:00
security smack: fix bug: setting task label silently ignores input garbage 2025-12-18 13:54:40 +01:00
sound ALSA: usb-audio: Add native DSD quirks for PureAudio DAC series 2025-12-12 18:37:20 +01:00
tools tracing/tools: Fix incorrcet short option in usage text for --threads 2025-12-01 11:43:38 +01:00
usr kbuild: uapi: Strip comments before size type check 2025-11-13 15:34:35 -05:00
virt KVM: guest_memfd: Remove bindings on memslot deletion when gmem is dying 2025-11-24 10:36:06 +01:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: give Clippy the minimum supported Rust version 2025-08-01 09:48:44 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -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: Remove self from DSA entry 2024-11-03 12:52:38 -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 staging: rtl8712: Remove driver using deprecated API wext 2025-12-07 06:25:02 +09:00
Makefile Linux 6.12.62 2025-12-12 18:37:22 +01:00
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.