1 files changed, 32 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/brcm/370-v5.2-brcmfmac-send-mailbox-interrupt-twice-for-specific-h.patch b/package/kernel/mac80211/patches/brcm/370-v5.2-brcmfmac-send-mailbox-interrupt-twice-for-specific-h.patch
new file mode 100644
index 0000000000..c0a1fcd615
--- /dev/null
+++ b/package/kernel/mac80211/patches/brcm/370-v5.2-brcmfmac-send-mailbox-interrupt-twice-for-specific-h.patch
@@ -0,0 +1,32 @@
+From 99d94ef367af67f630b38c93ff46c5819b7d06b6 Mon Sep 17 00:00:00 2001
+From: Wright Feng <Wright.Feng@cypress.com>
+Date: Thu, 25 Apr 2019 07:05:46 +0000
+Subject: [PATCH] brcmfmac: send mailbox interrupt twice for specific hardware
+ device
+
+For PCIE wireless device with core revision less than 14, device may miss
+PCIE to System Backplane Interrupt via PCIEtoSBMailbox. So add sending
+mail box interrupt twice as a hardware workaround.
+
+Signed-off-by: Wright Feng <wright.feng@cypress.com>
+Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
+Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
+---
+ drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
++++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
+@@ -698,7 +698,11 @@ brcmf_pcie_send_mb_data(struct brcmf_pci
+ 
+ 	brcmf_pcie_write_tcm32(devinfo, addr, htod_mb_data);
+ 	pci_write_config_dword(devinfo->pdev, BRCMF_PCIE_REG_SBMBX, 1);
+-	pci_write_config_dword(devinfo->pdev, BRCMF_PCIE_REG_SBMBX, 1);
++
++	/* Send mailbox interrupt twice as a hardware workaround */
++	core = brcmf_chip_get_core(devinfo->ci, BCMA_CORE_PCIE2);
++	if (core->rev <= 13)
++		pci_write_config_dword(devinfo->pdev, BRCMF_PCIE_REG_SBMBX, 1);
+ 
+ 	return 0;
+ }