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Mark Brown 08dca4c809 spi: cadence-quadspi: Parse DT for flashes with the rest of the DT parsing 
[ Upstream commit 9f0736a4e1 ]

The recent refactoring of where runtime PM is enabled done in commit
f1eb4e792b ("spi: spi-cadence-quadspi: Enable pm runtime earlier to
avoid imbalance") made the fact that when we do a pm_runtime_disable()
in the error paths of probe() we can trigger a runtime disable which in
turn results in duplicate clock disables.  This is particularly likely
to happen when there is missing or broken DT description for the flashes
attached to the controller.

Early on in the probe function we do a pm_runtime_get_noresume() since
the probe function leaves the device in a powered up state but in the
error path we can't assume that PM is enabled so we also manually
disable everything, including clocks. This means that when runtime PM is
active both it and the probe function release the same reference to the
main clock for the IP, triggering warnings from the clock subsystem:

[    8.693719] clk:75:7 already disabled
[    8.693791] WARNING: CPU: 1 PID: 185 at /usr/src/kernel/drivers/clk/clk.c:1188 clk_core_disable+0xa0/0xb
...
[    8.694261]  clk_core_disable+0xa0/0xb4 (P)
[    8.694272]  clk_disable+0x38/0x60
[    8.694283]  cqspi_probe+0x7c8/0xc5c [spi_cadence_quadspi]
[    8.694309]  platform_probe+0x5c/0xa4

Dealing with this issue properly is complicated by the fact that we
don't know if runtime PM is active so can't tell if it will disable the
clocks or not.  We can, however, sidestep the issue for the flash
descriptions by moving their parsing to when we parse the controller
properties which also save us doing a bunch of setup which can never be
used so let's do that.

Reported-by: Francesco Dolcini <francesco@dolcini.it>
Closes: https://lore.kernel.org/r/20251201072844.GA6785@francesco-nb
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://patch.msgid.link/20251204-spi-cadence-qspi-runtime-pm-imbalance-v2-1-10af9115d531@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-03-04 07:19:48 -05:00
arch parisc: Prevent interrupts during reboot 2026-03-04 07:19:44 -05:00
block block: decouple secure erase size limit from discard size limit 2026-03-04 07:19:38 -05:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec 2026-01-30 10:32:12 +01:00
Documentation ASoC: dt-bindings: asahi-kasei,ak5558: Fix the supply names 2026-02-26 14:59:46 -08:00
drivers spi: cadence-quadspi: Parse DT for flashes with the rest of the DT parsing 2026-03-04 07:19:48 -05:00
fs pstore: ram_core: fix incorrect success return when vmap() fails 2026-03-04 07:19:43 -05:00
include arm64/ftrace,bpf: Fix partial regs after bpf_prog_run 2026-03-04 07:19:41 -05:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring/timeout: annotate data race in io_flush_timeouts() 2026-03-04 07:19:36 -05:00
ipc ipc: don't audit capability check in ipc_permissions() 2026-02-26 14:59:19 -08:00
kernel sched/debug: Fix updating of ppos on server write ops 2026-03-04 07:19:43 -05:00
lib objpool: fix the overestimation of object pooling metadata size 2026-02-26 14:59:36 -08:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm mm/slab: fix false lockdep warning in __kfree_rcu_sheaf() 2026-02-26 14:59:14 -08:00
net bpf: net_sched: Use the correct destructor kfunc type 2026-03-04 07:19:40 -05:00
rust rust: cpufreq: always inline functions using build_assert with arguments 2026-03-04 07:19:37 -05:00
samples samples/ftrace: Adjust LoongArch register restore order in direct calls 2026-01-08 10:17:11 +01:00
scripts gendwarfksyms: Fix build on 32-bit hosts 2026-03-04 07:19:40 -05:00
security apparmor: fix aa_label to return state from compount and component match 2026-02-26 14:59:42 -08:00
sound ALSA: hda/realtek: Add quirk for Samsung Galaxy Book3 Pro 360 (NP965QFG) 2026-02-26 14:59:46 -08:00
tools bpftool: Fix dependencies for static build 2026-03-04 07:19:42 -05:00
usr gen_init_cpio: Ignore fsync() returning EINVAL on pipes 2025-10-07 09:53:05 -07:00
virt KVM: Don't clobber irqfd routing type when deassigning irqfd 2026-02-11 13:41:44 +01:00
.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 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 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 8 hotfixes. 4 are cc:stable, 7 are against mm/. 2025-11-26 12:38:05 -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 soc: fixes for 6.18, part 4 2025-11-28 09:57:31 -08:00
Makefile Linux 6.18.15 2026-02-27 16:05:10 -05:00
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.