tg3: Fix 57765 B0 data corruption

The PCIe max FTS limit is too aggressive on these chips.  This patch
loosens the limit a little to eliminate data corruption issues.

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, 16 insertions, 0 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index b2b1ba168c88..09f2c11db247 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -7990,6 +7990,22 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
                         tw32(GRC_MODE, grc_mode);
                 }
 
+                if (GET_CHIP_REV(tp->pci_chip_rev_id) != CHIPREV_57765_AX) {
+                        u32 grc_mode = tr32(GRC_MODE);
+
+                        /* Access the lower 1K of DL PCIE block registers. */
+                        val = grc_mode & ~GRC_MODE_PCIE_PORT_MASK;
+                        tw32(GRC_MODE, val | GRC_MODE_PCIE_DL_SEL);
+
+                        val = tr32(TG3_PCIE_TLDLPL_PORT +
+                                   TG3_PCIE_DL_LO_FTSMAX);
+                        val &= ~TG3_PCIE_DL_LO_FTSMAX_MSK;
+                        tw32(TG3_PCIE_TLDLPL_PORT + TG3_PCIE_DL_LO_FTSMAX,
+                             val | TG3_PCIE_DL_LO_FTSMAX_VAL);
+
+                        tw32(GRC_MODE, grc_mode);
+                }
+
                 val = tr32(TG3_CPMU_LSPD_10MB_CLK);
                 val &= ~CPMU_LSPD_10MB_MACCLK_MASK;
                 val |= CPMU_LSPD_10MB_MACCLK_6_25;