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i3c: mipi-i3c-hci: Increase DMA transfer ring size to maximum

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The DMA transfer ring is currently limited to 16 entries, despite the
MIPI I3C HCI supporting up to 32 devices.  When the ring lacks space for a
new transfer list, the driver returns -EBUSY, which can be unexpected
for clients.

Increase the DMA transfer ring size to the maximum supported value of
255 entries.  This effectively eliminates ring-space exhaustion in
practice and avoids the complexity of adding secondary queuing
mechanisms.

Even at the maximum size, the memory overhead remains small
(approximately 24 bytes per entry by default).

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260603090754.16252-18-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Adrian Hunter 2026-06-03 12:07:54 +03:00 committed by Alexandre Belloni
parent 1a7c9c143a
commit e62fe9f267
1 changed files with 1 additions and 1 deletions
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2
drivers/i3c/master/mipi-i3c-hci/dma.c
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@ -27,7 +27,7 @@
*/
#define XFER_RINGS 1 /* max: 8 */
#define XFER_RING_ENTRIES 16 /* max: 255 */
#define XFER_RING_ENTRIES 255 /* max: 255 */
#define IBI_RINGS 1 /* max: 8 */
#define IBI_STATUS_RING_ENTRIES 32 /* max: 255 */