i3c: mipi-i3c-hci: Fallback to software reset when bus disable fails

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Disruption of the MIPI I3C HCI controller's internal state can cause
i3c_hci_bus_disable() to fail when attempting to shut down the bus.

In the code paths where bus disable is invoked - bus clean-up and runtime
suspend - the controller does not need to remain operational afterward, so
a full controller reset is a safe recovery mechanism.

Add a fallback to issue a software reset when disabling the bus fails.
This ensures the bus is reliably halted even if the controller's state
machine is stuck or unresponsive.

The fallback is used both during bus clean-up and in the runtime suspend
path.  In the latter case, ensure interrupts are quiesced after reset.

Fixes: 9ad9a52cce ("i3c/master: introduce the mipi-i3c-hci driver")
Cc: stable@vger.kernel.org
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260306072451.11131-15-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

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Adrian Hunter 2026-03-06 09:24:51 +02:00 • committed by Alexandre Belloni

parent c6396b835a

commit 9a258d1336

1 changed files with 35 additions and 30 deletions

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drivers/i3c/master/mipi-i3c-hci/core.c

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