[PATCH v2 0/2] spi: spi-ti-qspi: finalize message on transfer error

[Joseph CT Chan <jctchan@gmail.com>]

From: Joseph CT Chan <josephctchan@google.com>

Hi Mark,

When a transfer fails in ti_qspi_start_transfer_one(), for example on a
write completion timeout, the driver returns without finalizing the
message and without writing QSPI_INVAL to end the frame. A queued
caller then waits forever, and a spi_sync() that took the no-queue path
gets -EINPROGRESS instead of the error. Patch 1 sends the error through
the existing exit path, which ends the frame, sets the status and
finalizes the message. Patch 2 adds a KUnit test that emulates the
controller registers with logic_iomem on ARCH=um.

Tested with KUnit on ARCH=um: ti_qspi_test passes with patch 1 and
fails without it. Not tested on hardware.

Changes in v2:
- Split out of the v1 14-patch series, as David suggested.
- Patch 2: trimmed the comments in the test.
- Moved the AI assistance note from an Assisted-by tag into the commit message.

v1: https://lore.kernel.org/all/20261102163023.2574632-1-jctchan@gmail.com/

This series depends on the SPI core series ("spi: unoptimize message
when queuing it fails" v2), which adds drivers/spi/tests/.kunitconfig
and the KUnit Makefile lines that patch 2 extends. Patch 1 applies on
its own.

SPI core series v2: https://lore.kernel.org/linux-spi/20261103224753.3610049-1-jctchan@gmail.com/

Please consider this patch series for the next merge window.

Thanks,
Joseph

Joseph CT Chan (2):
  spi: spi-ti-qspi: finalize message on transfer error
  spi: spi-ti-qspi: add KUnit tests for transfer error finalization

 drivers/spi/Kconfig                   |  12 ++
 drivers/spi/Makefile                  |   1 +
 drivers/spi/spi-ti-qspi.c             |   4 +-
 drivers/spi/tests/.kunitconfig        |   4 +
 drivers/spi/tests/Makefile            |   1 +
 drivers/spi/tests/spi-ti-qspi-kunit.c | 188 ++++++++++++++++++++++++++
 6 files changed, 208 insertions(+), 2 deletions(-)
 create mode 100644 drivers/spi/tests/spi-ti-qspi-kunit.c


base-commit: c339f4010dea8b0d754f84ace70cd1b089878ef8
prerequisite-patch-id: 6999a3baa2d32de8fa42f2626a845fe3cb63b0b2
prerequisite-patch-id: 686a62b9223209bf1e83740a0874e20d7607f69a
-- 
2.56.0.385.gac671c819a-goog