From: Adrian Hunter Date: Fri, 6 Mar 2026 08:53:35 +0000 (+0200) Subject: i3c: mipi-i3c-hci: Add quirk to allow IBI while runtime suspended X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=5fe77a6d8d5d89a250e277edf13ec73331b827ba;p=thirdparty%2Fkernel%2Flinux.git 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 Reviewed-by: Frank Li Link: https://patch.msgid.link/20260306085338.62955-3-adrian.hunter@intel.com Signed-off-by: Alexandre Belloni --- diff --git a/drivers/i3c/master/mipi-i3c-hci/core.c b/drivers/i3c/master/mipi-i3c-hci/core.c index 284f3ed7af8c..54d5492545ef 100644 --- a/drivers/i3c/master/mipi-i3c-hci/core.c +++ b/drivers/i3c/master/mipi-i3c-hci/core.c @@ -996,6 +996,9 @@ static int i3c_hci_probe(struct platform_device *pdev) if (hci->quirks & HCI_QUIRK_RPM_ALLOWED) i3c_hci_rpm_enable(&pdev->dev); + if (hci->quirks & HCI_QUIRK_RPM_IBI_ALLOWED) + hci->master.rpm_ibi_allowed = true; + return i3c_master_register(&hci->master, &pdev->dev, &i3c_hci_ops, false); } diff --git a/drivers/i3c/master/mipi-i3c-hci/hci.h b/drivers/i3c/master/mipi-i3c-hci/hci.h index 9ac9d0e342f4..02cab3b3bc6f 100644 --- a/drivers/i3c/master/mipi-i3c-hci/hci.h +++ b/drivers/i3c/master/mipi-i3c-hci/hci.h @@ -150,6 +150,7 @@ struct i3c_hci_dev_data { #define HCI_QUIRK_OD_PP_TIMING BIT(3) /* Set OD and PP timings for AMD platforms */ #define HCI_QUIRK_RESP_BUF_THLD BIT(4) /* Set resp buf thld to 0 for AMD platforms */ #define HCI_QUIRK_RPM_ALLOWED BIT(5) /* Runtime PM allowed */ +#define HCI_QUIRK_RPM_IBI_ALLOWED BIT(6) /* IBI and Hot-Join allowed while runtime suspended */ /* global functions */ void mipi_i3c_hci_resume(struct i3c_hci *hci);