i2c: spacemit: ensure SDA is released after bus reset

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[ Upstream commit 0de6194324 ]

After performing a conditional bus reset, the controller must ensure
that the SDA line is actually released.

Previously, the reset routine only performed a single check,
which could leave the bus in a locked state in some situations.

This patch introduces a loop that toggles the reset cycle and issues
a reset request up to SPACEMIT_BUS_RESET_CLK_CNT_MAX times, checking
SDA after each attempt. If SDA is released before the maximum count,
the function returns early. Otherwise, a warning is emitted.

This change improves bus recovery reliability.

Fixes: 5ea558473f ("i2c: spacemit: add support for SpacemiT K1 SoC")
Signed-off-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Troy Mitchell 2025-09-25 10:02:29 +08:00 • committed by Greg Kroah-Hartman

parent 3109d76b95

commit d116241569

1 changed files with 20 additions and 1 deletions

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drivers/i2c/busses/i2c-k1.c

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