i3c: mipi-i3c-hci: Consolidate spinlocks

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commit fa12bb903b upstream.

The MIPI I3C HCI driver currently uses separate spinlocks for different
contexts (PIO vs. DMA rings).  This split is unnecessary and complicates
upcoming fixes.  The driver does not support concurrent PIO and DMA
operation, and it only supports a single DMA ring, so a single lock is
sufficient for all paths.

Introduce a unified spinlock in struct i3c_hci, switch both PIO and DMA
code to use it, and remove the per-context locks.

No functional change is intended in this patch.

Fixes: 9ad9a52cce ("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/20260306072451.11131-5-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Adrian Hunter 2026-03-06 09:24:41 +02:00 • committed by Greg Kroah-Hartman

parent 74a4f77bbf

commit d986d51a83

4 changed files with 16 additions and 17 deletions

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2

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

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14

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

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1

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

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16

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

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