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i3c: mipi-i3c-hci: Add quirk to allow IBI while runtime suspended

Some I3C controllers can be automatically runtime-resumed in order to
handle in-band interrupts (IBIs), meaning that runtime suspend does not
need to be blocked when IBIs are enabled.

For example, a PCI-attached controller in a low-power state may generate
a Power Management Event (PME) when the SDA line is pulled low to signal
the START condition of an IBI. The PCI subsystem will then runtime-resume
the device, allowing the IBI to be received without requiring the
controller to remain active.

Introduce a new quirk, HCI_QUIRK_RPM_IBI_ALLOWED, so that drivers can
opt-in to this capability via driver data.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260306085338.62955-3-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

authored by

Adrian Hunter and committed by
Alexandre Belloni 5fe77a6d 815b4448

+4
+3
drivers/i3c/master/mipi-i3c-hci/core.c
··· 996 996 if (hci->quirks & HCI_QUIRK_RPM_ALLOWED) 997 997 i3c_hci_rpm_enable(&pdev->dev); 998 998 999 + if (hci->quirks & HCI_QUIRK_RPM_IBI_ALLOWED) 1000 + hci->master.rpm_ibi_allowed = true; 1001 + 999 1002 return i3c_master_register(&hci->master, &pdev->dev, &i3c_hci_ops, false); 1000 1003 } 1001 1004
+1
drivers/i3c/master/mipi-i3c-hci/hci.h
··· 150 150 #define HCI_QUIRK_OD_PP_TIMING BIT(3) /* Set OD and PP timings for AMD platforms */ 151 151 #define HCI_QUIRK_RESP_BUF_THLD BIT(4) /* Set resp buf thld to 0 for AMD platforms */ 152 152 #define HCI_QUIRK_RPM_ALLOWED BIT(5) /* Runtime PM allowed */ 153 + #define HCI_QUIRK_RPM_IBI_ALLOWED BIT(6) /* IBI and Hot-Join allowed while runtime suspended */ 153 154 154 155 /* global functions */ 155 156 void mipi_i3c_hci_resume(struct i3c_hci *hci);