[PATCH 00/17] i3c: mipi-i3c-hci-pci: Add Runtime PM support

Adrian Hunter
2025-12-19T14:45:53Z

Hi

This patch set adds Runtime PM support to mipi-i3c-hci and
mipi-i3c-hci-pci.

Notably, the master core is enhanced to optionally support
doing the RPM gets/puts needed to ensure a device is runtime
resumed for all bus operations. That alleviates mipi-i3c-hci
from having to do it, and if the approach is accepted, would
allow other master drivers to drop their RPM gets/puts.

There are a number of small patches making various improvements
for things hit during development. Plus a bunch of patches
preparing for the main changes which are covered in the last 3
patches.

Adrian Hunter (17):
i3c: mipi-i3c-hci: Reset RING_OPERATION1 fields during init
i3c: mipi-i3c-hci: Ensure proper bus clean-up
i3c: master: Update hot-join flag only on success
i3c: master: Replace WARN_ON() with dev_err() in i3c_dev_free_ibi_locked()
i3c: mipi-i3c-hci: Switch DAT bitmap allocation to devm_bitmap_zalloc()
i3c: mipi-i3c-hci: Switch PIO data allocation to devm_kzalloc()
i3c: mipi-i3c-hci: Manage DMA deallocation via devres action
i3c: mipi-i3c-hci: Cache DAT in memory for Runtime PM restore
i3c: mipi-i3c-hci: Introduce helper to restore DAT
i3c: mipi-i3c-hci: Extract ring initialization from hci_dma_init()
i3c: mipi-i3c-hci: Add DMA suspend and resume support
i3c: mipi-i3c-hci: Refactor PIO register initialization
i3c: mipi-i3c-hci: Add PIO suspend and resume support
i3c: mipi-i3c-hci: Factor out software reset into helper
i3c: master: Introduce optional Runtime PM support
i3c: mipi-i3c-hci: Add optional Runtime PM support
i3c: mipi-i3c-hci-pci: Add Runtime PM support

drivers/i3c/device.c | 46 +++++-
drivers/i3c/internals.h | 4 +
drivers/i3c/master.c | 101 +++++++++++-
drivers/i3c/master/mipi-i3c-hci/core.c | 171 +++++++++++++++++---
drivers/i3c/master/mipi-i3c-hci/dat.h | 2 +-
drivers/i3c/master/mipi-i3c-hci/dat_v1.c | 45 ++++--
drivers/i3c/master/mipi-i3c-hci/dma.c | 179 +++++++++++++++------
drivers/i3c/master/mipi-i3c-hci/hci.h | 11 ++
drivers/i3c/master/mipi-i3c-hci/mipi-i3c-hci-pci.c | 17 ++
drivers/i3c/master/mipi-i3c-hci/pio.c | 63 +++++---
include/linux/i3c/master.h | 4 +
11 files changed, 530 insertions(+), 113 deletions(-)

Regards
Adrian