tg3: Prevent a PCIe tx glitch
This patch prevents a PCIe tx glitch by allowing the transmitter to go
to a low power state.
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 1c53250..53a193e 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -6589,6 +6589,30 @@
tg3_mdio_start(tp);
+ if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_57780) {
+ u8 phy_addr;
+
+ phy_addr = tp->phy_addr;
+ tp->phy_addr = TG3_PHY_PCIE_ADDR;
+
+ tg3_writephy(tp, TG3_PCIEPHY_BLOCK_ADDR,
+ TG3_PCIEPHY_TXB_BLK << TG3_PCIEPHY_BLOCK_SHIFT);
+ val = TG3_PCIEPHY_TX0CTRL1_TXOCM | TG3_PCIEPHY_TX0CTRL1_RDCTL |
+ TG3_PCIEPHY_TX0CTRL1_TXCMV | TG3_PCIEPHY_TX0CTRL1_TKSEL |
+ TG3_PCIEPHY_TX0CTRL1_NB_EN;
+ tg3_writephy(tp, TG3_PCIEPHY_TX0CTRL1, val);
+ udelay(10);
+
+ tg3_writephy(tp, TG3_PCIEPHY_BLOCK_ADDR,
+ TG3_PCIEPHY_XGXS_BLK1 << TG3_PCIEPHY_BLOCK_SHIFT);
+ val = TG3_PCIEPHY_PWRMGMT4_LOWPWR_EN |
+ TG3_PCIEPHY_PWRMGMT4_L1PLLPD_EN;
+ tg3_writephy(tp, TG3_PCIEPHY_PWRMGMT4, val);
+ udelay(10);
+
+ tp->phy_addr = phy_addr;
+ }
+
if ((tp->tg3_flags2 & TG3_FLG2_PCI_EXPRESS) &&
tp->pci_chip_rev_id != CHIPREV_ID_5750_A0 &&
GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5785 &&