linux-kernel - [PATCH 0/7] i3c: mipi-i3c-hci-pci: Enable IBI while runtime suspended for Intel controllers

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Message-ID: <20260129181841.130864-1-adrian.hunter@intel.com>
Date: Thu, 29 Jan 2026 20:18:34 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: alexandre.belloni@...tlin.com
Cc: Frank.Li@....com,
	linux-i3c@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: [PATCH 0/7] i3c: mipi-i3c-hci-pci: Enable IBI while runtime suspended for Intel controllers

Hi

Here are patches related to enabling IBI while runtime suspended for Intel
controllers.

Intel LPSS I3C controllers can wake from runtime suspend to receive
in-band interrupts (IBIs).

It is non-trivial to implement because the parent PCI device has 2 I3C bus
instances (MIPI I3C HCI Multi-Bus Instance capability) represented by
platform devices with a separate driver, but the IBI-wakeup is shared by
both, which means runtime PM has to be managed by the parent PCI driver.

To make that work, the PCI driver handles runtime PM, but leverages the
mipi-i3c-hci platform driver's functionality for saving and restoring
controller state.

Adrian Hunter (7):
      i3c: mipi-i3c-hci-pci: Set d3hot_delay to 0 for Intel controllers
      i3c: master: Allow controller drivers to select runtime PM device
      i3c: master: Mark last_busy on IBI when runtime PM is allowed
      i3c: mipi-i3c-hci: Add quirk to allow IBI while runtime suspended
      i3c: mipi-i3c-hci: Allow parent to manage runtime PM
      i3c: mipi-i3c-hci-pci: Add optional ability to manage child runtime PM
      i3c: mipi-i3c-hci-pci: Enable IBI while runtime suspended for Intel controllers

 drivers/i3c/master.c                               |  14 +-
 drivers/i3c/master/mipi-i3c-hci/core.c             |  30 ++--
 drivers/i3c/master/mipi-i3c-hci/hci.h              |   7 +
 drivers/i3c/master/mipi-i3c-hci/mipi-i3c-hci-pci.c | 158 ++++++++++++++++++++-
 include/linux/i3c/master.h                         |   2 +
 5 files changed, 194 insertions(+), 17 deletions(-)

Regards
Adrian