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Stephan Gerhold c1368383cd pinctrl: qcom: Clear latched interrupt status when changing IRQ type 
commit e225128c3f upstream.

When submitting the TLMM test driver, Bjorn reported that some of the test
cases are failing for GPIOs that not are backed by PDC (i.e. "non-wakeup"
GPIOs that are handled directly in pinctrl-msm). Basically, lingering
latched interrupt state is still being delivered at IRQ request time, e.g.:

  ok 1 tlmm_test_silent_rising
  tlmm_test_silent_falling: ASSERTION FAILED at drivers/pinctrl/qcom/tlmm-test.c:178
  Expected atomic_read(&priv->intr_count) == 0, but
      atomic_read(&priv->intr_count) == 1 (0x1)
  not ok 2 tlmm_test_silent_falling
  tlmm_test_silent_low: ASSERTION FAILED at drivers/pinctrl/qcom/tlmm-test.c:178
  Expected atomic_read(&priv->intr_count) == 0, but
      atomic_read(&priv->intr_count) == 1 (0x1)
  not ok 3 tlmm_test_silent_low
  ok 4 tlmm_test_silent_high

Whether to report interrupts that came in while the IRQ was unclaimed
doesn't seem to be well-defined in the Linux IRQ API. However, looking
closer at these specific cases, we're actually reporting events that do not
match the interrupt type requested by the driver:

 1. After "ok 1 tlmm_test_silent_rising", the GPIO is in low state and
    configured for IRQF_TRIGGER_RISING.

 2. (a) In preparation for "tlmm_test_silent_falling", the GPIO is switched
        to high state. The rising interrupt gets latched.
    (b) The GPIO is re-configured for IRQF_TRIGGER_FALLING, but the latched
        interrupt isn't cleared.
    (c) The IRQ handler is called for the latched interrupt, but there
        wasn't any falling edge.

 3. (a) For "tlmm_test_silent_low", the GPIO remains in high state.
    (b) The GPIO is re-configured for IRQF_TRIGGER_LOW. This seems to
        result in a phantom interrupt that gets latched.
    (c) The IRQ handler is called for the latched interrupt, but the GPIO
        isn't in low state.

 4. (a) For "tlmm_test_silent_high", the GPIO is switched to low state.
    (b) This doesn't result in a latched interrupt, because RAW_STATUS_EN
        was cleared when masking the level-triggered interrupt.

Fix this by clearing the interrupt state whenever making any changes to the
interrupt configuration. This includes previously disabled interrupts, but
also any changes to interrupt polarity or detection type.

With this change, all 16 test cases are now passing for the non-wakeup
GPIOs in the TLMM.

Cc: stable@vger.kernel.org
Fixes: cf9d052aa6 ("pinctrl: qcom: Don't clear pending interrupts when enabling")
Reported-by: Bjorn Andersson <bjorn.andersson@oss.qualcomm.com>
Closes: https://lore.kernel.org/r/20250227-tlmm-test-v1-1-d18877b4a5db@oss.qualcomm.com/
Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org>
Tested-by: Bjorn Andersson <andersson@kernel.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/20250312-pinctrl-msm-type-latch-v1-1-ce87c561d3d7@linaro.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-04-20 10:15:58 +02:00
arch KVM: x86: Acquire SRCU in KVM_GET_MP_STATE to protect guest memory accesses 2025-04-20 10:15:55 +02:00
block block: fix 'kmem_cache of name 'bio-108' already exists' 2025-03-22 12:54:21 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: api - Fix larval relookup type and mask 2025-04-10 14:39:20 +02:00
Documentation dt-bindings: coresight: qcom,coresight-tpdm: Fix too many 'reg' 2025-04-20 10:15:53 +02:00
drivers pinctrl: qcom: Clear latched interrupt status when changing IRQ type 2025-04-20 10:15:58 +02:00
fs dlm: fix error if active rsb is not hashed 2025-04-20 10:15:53 +02:00
include landlock: Add the errata interface 2025-04-20 10:15:55 +02:00
init ARM: 9443/1: Require linker to support KEEP within OVERLAY for DCE 2025-04-10 14:39:40 +02:00
io_uring io_uring/kbuf: reject zero sized provided buffers 2025-04-20 10:15:40 +02:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-05 14:03:02 +01:00
kernel ftrace: Properly merge notrace hashes 2025-04-20 10:15:54 +02:00
lib lib: scatterlist: fix sg_split_phys to preserve original scatterlist offsets 2025-04-20 10:15:45 +02:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/hwpoison: introduce folio_contain_hwpoisoned_page() helper 2025-04-20 10:15:50 +02:00
net sctp: detect and prevent references to a freed transport in sendmsg 2025-04-20 10:15:50 +02:00
rust rust: Fix enabling Rust and building with GCC for LoongArch 2025-04-10 14:39:36 +02:00
samples rust: treewide: switch to the kernel Vec type 2025-03-13 13:01:46 +01:00
scripts kbuild: exclude .rodata.(cst|str)* when building ranges 2025-04-20 10:15:44 +02:00
security landlock: Prepare to add second errata 2025-04-20 10:15:56 +02:00
sound ALSA: hda/realtek: Enable Mute LED on HP OMEN 16 Laptop xd000xx 2025-04-20 10:15:42 +02:00
tools selftests/landlock: Add a new test for setuid() 2025-04-20 10:15:56 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-13 13:02:18 +01:00
virt KVM: Allow building irqbypass.ko as as module when kvm.ko is a module 2025-04-20 10:15:54 +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: enable Clippy's check-private-items 2025-03-13 13:01:42 +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: add entry for the Rust alloc module 2025-03-13 13:01:47 +01:00
Makefile Linux 6.12.23 2025-04-10 14:39:41 +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.