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

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Message-Id: <20250321-acpm-atomic-v1-0-fb887bde7e61@linaro.org>
Date: Fri, 21 Mar 2025 16:40:56 +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 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 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.

Signed-off-by: André Draszik <andre.draszik@...aro.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 | 34 +++++++++++++++++++++++++---------
 1 file changed, 25 insertions(+), 9 deletions(-)
---
base-commit: c4d4884b67802c41fd67399747165d65c770621a
change-id: 20250321-acpm-atomic-033775b051ef

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