i3c: mipi-i3c-hci-pci: Add System Suspend support

Assign the driver PM operations pointer, which is necessary for the PCI
subsystem to put the device into a low power state.  Refer to
pci_pm_suspend_noirq() which bails out if the pointer is NULL, before
it has the opportunity to call pci_prepare_to_sleep().

No other actions are necessary as the mipi-i3c-hci driver takes care of
controller state.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260123063325.8210-4-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

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 1b38771667e5a3198a9f5929b1e0154efbef4d6d..0f05a15c14c7f786d219e853efb7af61b0657420 100644 (file)
--- a/drivers/i3c/master/mipi-i3c-hci/mipi-i3c-hci-pci.c
+++ b/drivers/i3c/master/mipi-i3c-hci/mipi-i3c-hci-pci.c
@@ -320,6 +320,10 @@ static void mipi_i3c_hci_pci_remove(struct pci_dev *pci)
        mfd_remove_devices(&pci->dev);
 }
 
+/* PM ops must exist for PCI to put a device to a low power state */
+static const struct dev_pm_ops mipi_i3c_hci_pci_pm_ops = {
+};
+
 static const struct pci_device_id mipi_i3c_hci_pci_devices[] = {
        /* Wildcat Lake-U */
        { PCI_VDEVICE(INTEL, 0x4d7c), (kernel_ulong_t)&intel_mi_1_info},
@@ -342,6 +346,9 @@ static struct pci_driver mipi_i3c_hci_pci_driver = {
        .id_table = mipi_i3c_hci_pci_devices,
        .probe = mipi_i3c_hci_pci_probe,
        .remove = mipi_i3c_hci_pci_remove,
+       .driver = {
+               .pm = pm_ptr(&mipi_i3c_hci_pci_pm_ops)
+       },
 };
 
 module_pci_driver(mipi_i3c_hci_pci_driver);