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>

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
index fd3968fd158e95e6bcc55fb6884b4d26e138f2d2..66ee92bb51789cb1cc57391e21d72c7a4d55136d 100644 (file)
--- 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_pciedev_info *devinfo, u32 htod_mb_data)
 
        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;
 }