tg3: Improve 5785 PCIe performance

This patch improves 5785 performance by allowing the write DMA engine to
request larger DMA burst sizes than it otherwise would.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 54dbe988f5f..a43ef2b3a53 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -7633,6 +7633,9 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
         if (tp->tg3_flags3 & TG3_FLG3_5755_PLUS)
                 val |= WDMAC_MODE_STATUS_TAG_FIX;
 
+        if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5785)
+                val |= WDMAC_MODE_BURST_ALL_DATA;
+
         tw32_f(WDMAC_MODE, val);
         udelay(40);