openwrt/package/kernel/mac80211/patches/brcm/370-v5.2-brcmfmac-send-mailbox-interrupt-twice-for-specific-h.patch

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;
 }