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Marek Vasut ec853bd885 PCI: rcar-gen4: Fix inverted break condition in PHY initialization 
[ Upstream commit 2bdf1d428f ]

R-Car V4H Reference Manual R19UH0186EJ0130 Rev.1.30 Apr. 21, 2025 page 4581
Figure 104.3b Initial Setting of PCIEC(example), third quarter of the
figure indicates that register 0xf8 should be polled until bit 18 becomes
set to 1.

Register 0xf8, bit 18 is 0 immediately after write to PCIERSTCTRL1 and is
set to 1 in less than 1 ms afterward. The current readl_poll_timeout()
break condition is inverted and returns when register 0xf8, bit 18 is set
to 0, which in most cases means immediately. In case
CONFIG_DEBUG_LOCK_ALLOC=y, the timing changes just enough for the first
readl_poll_timeout() poll to already read register 0xf8, bit 18 as 1 and
afterward never read register 0xf8, bit 18 as 0, which leads to timeout
and failure to start the PCIe controller.

Fix this by inverting the poll condition to match the reference manual
initialization sequence.

Fixes: faf5a975ee ("PCI: rcar-gen4: Add support for R-Car V4H")
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20250915235910.47768-1-marek.vasut+renesas@mailbox.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-10-15 12:00:17 +02:00
arch sparc: fix accurate exception reporting in copy_{from,to}_user for M7 2025-10-15 12:00:14 +02:00
block block: use int to store blk_stack_limits() return value 2025-10-15 11:59:58 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: rng - Ensure set_ent is always present 2025-10-12 12:57:19 +02:00
Documentation Documentation: trace: historgram-design: Separate sched_waking histogram section heading and the following diagram 2025-10-15 12:00:13 +02:00
drivers PCI: rcar-gen4: Fix inverted break condition in PHY initialization 2025-10-15 12:00:17 +02:00
fs NFSv4.1: fix backchannel max_resp_sz verification check 2025-10-15 12:00:16 +02:00
include HID: hidraw: tighten ioctl command parsing 2025-10-15 12:00:12 +02:00
init init: INITRAMFS_PRESERVE_MTIME should depend on BLK_DEV_INITRD 2025-10-15 11:59:53 +02:00
io_uring io_uring: fix incorrect io_kiocb reference in io_link_skb 2025-09-25 11:13:49 +02:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel bpf: Enforce expected_attach_type for tailcall compatibility 2025-10-15 12:00:04 +02:00
lib lib/sbitmap: convert shallow_depth from one word to the whole sbitmap 2025-08-20 18:30:49 +02:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm: swap: check for stable address space before operating on the VMA 2025-10-06 11:17:52 +02:00
net netfilter: nfnetlink: reset nlh pointer during batch replay 2025-10-15 12:00:16 +02:00
rust rust: block: fix srctree/ links 2025-10-12 12:57:16 +02:00
samples ftrace/samples: Fix function size computation 2025-09-19 16:35:44 +02:00
scripts gcc-plugins: Remove TODO_verify_il for GCC >= 16 2025-10-06 11:17:52 +02:00
security lsm: CONFIG_LSM can depend on CONFIG_SECURITY 2025-10-15 11:59:55 +02:00
sound ASoC: Intel: sof_sdw: Prevent jump to NULL add_sidecar callback 2025-10-15 12:00:13 +02:00
tools libbpf: Fix error when st-prefix_ops and ops from differ btf 2025-10-15 12:00:04 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-13 13:02:18 +01:00
virt KVM: Allow CPU to reschedule while setting per-page memory attributes 2025-07-17 18:37:08 +02:00
.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 MAINTAINERS: Update Alexey Makhalov's email address 2025-05-22 14:29:46 +02:00
Makefile Linux 6.12.52 2025-10-12 12:57:19 +02:00
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.