Commit b6d58643 authored by Adrian Hunter's avatar Adrian Hunter Committed by Alexandre Belloni
Browse files

i3c: mipi-i3c-hci: Restart DMA ring correctly after dequeue abort 



The DMA dequeue path attempts to restart the ring after aborting an
in-flight transfer, but the current sequence is incomplete. The controller
must be brought out of the aborted state and the ring control registers
must be programmed in the correct order: first clearing ABORT, then
re-enabling the ring and asserting RUN_STOP to resume operation.

Add the missing controller resume step and update the ring control writes
so that the ring is restarted using the proper sequence.

Fixes: 9ad9a52c ("i3c/master: introduce the mipi-i3c-hci driver")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: default avatarFrank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260306072451.11131-11-adrian.hunter@intel.com


Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent ec3cfd83

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

+2 −0
Original line number Diff line number Diff line
@@ -600,7 +600,9 @@ static bool hci_dma_dequeue_xfer(struct i3c_hci *hci, 
	}



	/* restart the ring */

	mipi_i3c_hci_resume(hci);

	rh_reg_write(RING_CONTROL, RING_CTRL_ENABLE);

	rh_reg_write(RING_CONTROL, RING_CTRL_ENABLE | RING_CTRL_RUN_STOP);



	spin_unlock_irq(&hci->lock);