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>
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..d7d3e93461736f2a88ed5b42c431c6ae328dd063 100644 (file)
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
@@ -675,6 +675,7 @@ static int
 brcmf_pcie_send_mb_data(struct brcmf_pciedev_info *devinfo, u32 htod_mb_data)
 {
        struct brcmf_pcie_shared_info *shared;
+       struct brcmf_core *core;
        u32 addr;
        u32 cur_htod_mb_data;
        u32 i;
@@ -698,7 +699,11 @@ 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;
 }