1:  156636cac8ff ! 1:  c19892755aa9 wifi: brcmfmac: handle missing D3 ACK on BCM4377 T2 Macs
    @@ Commit message
         The current PCIe suspend callback treats this as fatal and aborts system
         suspend.
     
    -    On the affected PCI and DMI combinations, mask the mailbox interrupt,
    -    preserve the bus-down state, and let generic PCI/ACPI suspend proceed. On
    -    resume the existing recovery path tears down and probes the device again
    -    instead of relying on a D0 mailbox transaction.
    +    When this happens on BCM4377, mask the mailbox interrupt, preserve the
    +    bus-down state, and let generic PCI/ACPI suspend proceed. On resume the
    +    existing recovery path tears down and probes the device again instead of
    +    relying on a D0 mailbox transaction.
     
         Tested-on: MacBookAir9,1, MacBookPro15,4, MacBookPro16,3
         Signed-off-by: Andre Eikmeyer <dev@deq.rocks>
     
      ## drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c ##
    -@@
    - #include <linux/pci.h>
    - #include <linux/vmalloc.h>
    - #include <linux/delay.h>
    -+#include <linux/dmi.h>
    - #include <linux/interrupt.h>
    - #include <linux/bcma/bcma.h>
    - #include <linux/sched.h>
    -@@ drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c: enum brcmf_pcie_state {
    - 	BRCMFMAC_PCIE_STATE_UP
    - };
    - 
    -+/*
    -+ * BCM4377 on these T2 Macs never acknowledges HOST_D3_INFORM. The platform
    -+ * can nevertheless enter and leave system suspend if the PCIe mailbox
    -+ * interrupt is masked and resume takes the existing cold-reprobe path.
    -+ */
    -+static const struct dmi_system_id brcmf_pcie_no_d3_ack_quirk[] = {
    -+	{
    -+		.matches = {
    -+			DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
    -+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "MacBookAir9,1"),
    -+		},
    -+	},
    -+	{
    -+		.matches = {
    -+			DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
    -+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "MacBookPro15,4"),
    -+		},
    -+	},
    -+	{
    -+		.matches = {
    -+			DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
    -+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "MacBookPro16,3"),
    -+		},
    -+	},
    -+	{}
    -+};
    -+
    -+static bool brcmf_pcie_quirk_no_d3_ack(struct pci_dev *pdev)
    -+{
    -+	return pdev->vendor == PCI_VENDOR_ID_BROADCOM &&
    -+	       pdev->device == BRCM_PCIE_4377_DEVICE_ID &&
    -+	       dmi_check_system(brcmf_pcie_no_d3_ack_quirk);
    -+}
    -+
    - BRCMF_FW_DEF(43602, "brcmfmac43602-pcie");
    - BRCMF_FW_DEF(4350, "brcmfmac4350-pcie");
    - BRCMF_FW_DEF(4350C, "brcmfmac4350c2-pcie");
     @@ drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c: static int brcmf_pcie_pm_enter_D3(struct device *dev)
      	wait_event_timeout(devinfo->mbdata_resp_wait, devinfo->mbdata_completed,
      			   BRCMF_PCIE_MBDATA_TIMEOUT);
      	if (!devinfo->mbdata_completed) {
    -+		if (brcmf_pcie_quirk_no_d3_ack(devinfo->pdev)) {
    ++		if (devinfo->pdev->device == BRCM_PCIE_4377_DEVICE_ID) {
     +			dev_info(dev, "D3 ACK missing; masking PCIe mailbox interrupt\n");
     +			brcmf_pcie_intr_disable(devinfo);
     +			goto done;