diff options
| author | Adrian Hunter <adrian.hunter@intel.com> | 2026-03-06 09:24:47 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-03-19 16:08:48 +0100 |
| commit | 57f99dc660e698bce132f885956ec105a8444c8d (patch) | |
| tree | 2edb98295843364a730d151fba5c5dfadd735943 | |
| parent | d986d51a83f5c7dce0b4e8e0535e80339a2e62fc (diff) | |
i3c: mipi-i3c-hci: Restart DMA ring correctly after dequeue abort
commit b6d586431ae20d5157ee468d0ef62ad26798ef13 upstream.
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: 9ad9a52cce282 ("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/20260306072451.11131-11-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/i3c/master/mipi-i3c-hci/dma.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/i3c/master/mipi-i3c-hci/dma.c b/drivers/i3c/master/mipi-i3c-hci/dma.c index 9a1cc531ac98..5c306dc5b564 100644 --- a/drivers/i3c/master/mipi-i3c-hci/dma.c +++ b/drivers/i3c/master/mipi-i3c-hci/dma.c @@ -528,7 +528,9 @@ 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); return did_unqueue; } |