linux-kernel - [PATCH v2 0/2] firmware: exynos-acpm: allow use during system shutdown

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Message-Id: <20250324-acpm-atomic-v2-0-7d87746e1765@linaro.org>
Date: Mon, 24 Mar 2025 15:34:08 +0000
From: André Draszik <andre.draszik@...aro.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>, 
 Krzysztof Kozlowski <krzk@...nel.org>, 
 Alim Akhtar <alim.akhtar@...sung.com>
Cc: Peter Griffin <peter.griffin@...aro.org>, 
 Will McVicker <willmcvicker@...gle.com>, kernel-team@...roid.com, 
 linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, 
 André Draszik <andre.draszik@...aro.org>
Subject: [PATCH v2 0/2] firmware: exynos-acpm: allow use during system
 shutdown

One user of this ACPM driver is a PMIC driver that needs to communicate
with the PMIC during late system shutdown [1] and at that time we are
not allowed to sleep anymore.

This series address this by switching the code to using udelay() in the
specific case of system shutdown. This approach was inspired by I2C's
i2c_in_atomic_xfer_mode(), which has to deal with a similar corner
case.

Link: https://lore.kernel.org/all/20250323-s2mpg10-v1-29-d08943702707@linaro.org/ [1]

Signed-off-by: André Draszik <andre.draszik@...aro.org>
---
Changes in v2:
- add missing ktime.h include
- switch to ktime_before() instead of !ktime_after()
- add link to user requiring this change to cover letter
- collect Tudor's Rb
- Link to v1: https://lore.kernel.org/r/20250321-acpm-atomic-v1-0-fb887bde7e61@linaro.org

---
André Draszik (2):
      firmware: exynos-acpm: use ktime APIs for timeout detection
      firmware: exynos-acpm: allow use during system shutdown

 drivers/firmware/samsung/exynos-acpm.c | 35 +++++++++++++++++++++++++---------
 1 file changed, 26 insertions(+), 9 deletions(-)
---
base-commit: 9388ec571cb1adba59d1cded2300eeb11827679c
change-id: 20250321-acpm-atomic-033775b051ef

Best regards,
-- 
André Draszik <andre.draszik@...aro.org>