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

Adrian Hunter
2026-01-29T18:19:14Z

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@intel.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