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i3c: mipi-i3c-hci: Wait for DMA ring restart to complete

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Although hci_dma_dequeue_xfer() is serialized against itself via
control_mutex, this does not guarantee that a DMA ring restart
triggered by a previous invocation has fully completed.

When the function is called again in rapid succession, the DMA ring may
still be transitioning back to the running state, which may confound or
disrupt further state changes.

Address this by waiting for the DMA ring restart to complete before
continuing.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260603090754.16252-5-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Adrian Hunter 2026-06-03 12:07:41 +03:00 committed by Alexandre Belloni
parent c9b57ad978
commit e251e7c9fd
1 changed files with 3 additions and 0 deletions
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3
drivers/i3c/master/mipi-i3c-hci/dma.c
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@ -617,6 +617,7 @@ static bool hci_dma_dequeue_xfer(struct i3c_hci *hci,
}
/* restart the ring */
reinit_completion(&rh->op_done);
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);
@ -625,6 +626,8 @@ static bool hci_dma_dequeue_xfer(struct i3c_hci *hci,
spin_unlock_irq(&hci->lock);
wait_for_completion_timeout(&rh->op_done, HZ);
return did_unqueue;
}