tg3: Fix int generation hw bug for 5719 / 5720

On the 5719 and 5720, there is a bug where the hardware will
misinterpret a status tag update and leave interrupts permanently
disabled.  This patch enables a hardware fix that works around the
issue.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 693f36e94dab..a72d0314ca78 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -8198,6 +8198,9 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
                       ~DMA_RWCTRL_DIS_CACHE_ALIGNMENT;
                 if (tp->pci_chip_rev_id == CHIPREV_ID_57765_A0)
                         val &= ~DMA_RWCTRL_CRDRDR_RDMA_MRRS_MSK;
+                if (GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_57765 &&
+                    GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5717)
+                        val |= DMA_RWCTRL_TAGGED_STAT_WA;
                 tw32(TG3PCI_DMA_RW_CTRL, val | tp->dma_rwctrl);
         } else if (GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5784 &&
                    GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5761) {
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index eaa76694efb5..6f37d2a23544 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -188,6 +188,7 @@
 #define   METAL_REV_B2                   0x02
 #define TG3PCI_DMA_RW_CTRL              0x0000006c
 #define  DMA_RWCTRL_DIS_CACHE_ALIGNMENT  0x00000001
+#define  DMA_RWCTRL_TAGGED_STAT_WA       0x00000080
 #define  DMA_RWCTRL_CRDRDR_RDMA_MRRS_MSK 0x00000380
 #define  DMA_RWCTRL_READ_BNDRY_MASK      0x00000700
 #define  DMA_RWCTRL_READ_BNDRY_DISAB     0x00000000