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

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Message-ID: <20260129181841.130864-8-adrian.hunter@intel.com>
Date: Thu, 29 Jan 2026 20:18:41 +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 7/7] i3c: mipi-i3c-hci-pci: Enable IBI while runtime suspended for Intel controllers

Intel LPSS I3C controllers can wake from runtime suspend to receive
in-band interrupts (IBIs), and they also implement the MIPI I3C HCI
Multi-Bus Instance capability.  When multiple I3C bus instances share the
same PCI wakeup, the PCI parent must coordinate runtime PM so that all
instances suspend together and their mipi-i3c-hci runtime suspend
callbacks are invoked in a consistent manner.

Enable IBI-based wakeup by setting HCI_QUIRK_RPM_IBI_ALLOWED for the
intel-lpss-i3c platform device.  Replace HCI_QUIRK_RPM_ALLOWED with
HCI_QUIRK_RPM_PARENT_MANAGED so that the mipi-i3c-hci core driver expects
runtime PM to be controlled by the PCI parent rather than by individual
instances.  For all Intel HCI PCI configurations, enable the corresponding
control_instance_pm flag in the PCI driver.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 drivers/i3c/master/mipi-i3c-hci/core.c             | 2 +-
 drivers/i3c/master/mipi-i3c-hci/mipi-i3c-hci-pci.c | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/i3c/master/mipi-i3c-hci/core.c b/drivers/i3c/master/mipi-i3c-hci/core.c
index cb974b0f9e17..67ae7441ce97 100644
--- a/drivers/i3c/master/mipi-i3c-hci/core.c
+++ b/drivers/i3c/master/mipi-i3c-hci/core.c
@@ -992,7 +992,7 @@ static const struct acpi_device_id i3c_hci_acpi_match[] = {
 MODULE_DEVICE_TABLE(acpi, i3c_hci_acpi_match);
 
 static const struct platform_device_id i3c_hci_driver_ids[] = {
-	{ .name = "intel-lpss-i3c", HCI_QUIRK_RPM_ALLOWED },
+	{ .name = "intel-lpss-i3c", HCI_QUIRK_RPM_IBI_ALLOWED | HCI_QUIRK_RPM_PARENT_MANAGED },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(platform, i3c_hci_driver_ids);
diff --git a/drivers/i3c/master/mipi-i3c-hci/mipi-i3c-hci-pci.c b/drivers/i3c/master/mipi-i3c-hci/mipi-i3c-hci-pci.c
index f7f776300a0f..2f72cf48e36c 100644
--- a/drivers/i3c/master/mipi-i3c-hci/mipi-i3c-hci-pci.c
+++ b/drivers/i3c/master/mipi-i3c-hci/mipi-i3c-hci-pci.c
@@ -200,6 +200,7 @@ static const struct mipi_i3c_hci_pci_info intel_mi_1_info = {
 	.id = {0, 1},
 	.instance_offset = {0, 0x400},
 	.instance_count = 2,
+	.control_instance_pm = true,
 };
 
 static const struct mipi_i3c_hci_pci_info intel_mi_2_info = {
@@ -209,6 +210,7 @@ static const struct mipi_i3c_hci_pci_info intel_mi_2_info = {
 	.id = {2, 3},
 	.instance_offset = {0, 0x400},
 	.instance_count = 2,
+	.control_instance_pm = true,
 };
 
 static const struct mipi_i3c_hci_pci_info intel_si_2_info = {
@@ -218,6 +220,7 @@ static const struct mipi_i3c_hci_pci_info intel_si_2_info = {
 	.id = {2},
 	.instance_offset = {0},
 	.instance_count = 1,
+	.control_instance_pm = true,
 };
 
 static int mipi_i3c_hci_pci_find_instance(struct mipi_i3c_hci_pci *hci, struct device *dev)
-- 
2.51.0