i2c: designware: Handle active target cleanly

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When the I2C controller attempts a new transaction while the target
controller is shutting down or restarting, it can lead to bus lockups
and system bootloops if the hardware enters an inconsistent state.

Address this by ensuring that the internal state machines are properly
cleared when disabling the controller if target activity is detected.

If the controller remains active after disabling, perform a bus recovery
to reset it to a known good state.

Signed-off-by: William A. Kennington III <william@wkennington.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260527-dw-i2c-v5-4-3483057f8d67@wkennington.com

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William A. Kennington III 2026-05-27 20:09:52 +00:00 • committed by Andi Shyti

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8

drivers/i2c/busses/i2c-designware-common.c

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31

drivers/i2c/busses/i2c-designware-master.c

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