i3c: mipi-i3c-hci: Add DMA-mode recovery for internal controller errors

Browse source

Handle internal I3C HCI errors when operating in DMA mode by adding a
simple recovery mechanism.

On detection of an internal controller error, mark recovery as needed and
attempt to restore operation by performing a software reset followed by
state restore.  To keep recovery straightforward on this unlikely error
path, all currently queued transfers are terminated and completed with an
error.

This allows the controller to resume operation after internal failures
rather than remaining permanently stuck.

Note, internal errors indicated by INTR_HC_INTERNAL_ERR, cause the
controller to stop.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260603090754.16252-14-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

...

This commit is contained in:

Adrian Hunter 2026-06-03 12:07:50 +03:00 • committed by Alexandre Belloni

parent 3cfb40ba95

commit 5738043bad

4 changed files with 92 additions and 9 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

6

drivers/i3c/master/mipi-i3c-hci/cmd.h

View file

1

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

View file

93

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

View file

1

drivers/i3c/master/mipi-i3c-hci/hci.h

View file