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path: root/drivers/net/tg3.c
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Diffstat (limited to 'drivers/net/tg3.c')
-rw-r--r--drivers/net/tg3.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index bb3b73435170..ecd64a224e95 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -3154,6 +3154,22 @@ static int tg3_setup_phy(struct tg3 *tp, int force_reset)
err = tg3_setup_copper_phy(tp, force_reset);
}
+ if (tp->pci_chip_rev_id == CHIPREV_ID_5784_A0) {
+ u32 val, scale;
+
+ val = tr32(TG3_CPMU_CLCK_STAT) & CPMU_CLCK_STAT_MAC_CLCK_MASK;
+ if (val == CPMU_CLCK_STAT_MAC_CLCK_62_5)
+ scale = 65;
+ else if (val == CPMU_CLCK_STAT_MAC_CLCK_6_25)
+ scale = 6;
+ else
+ scale = 12;
+
+ val = tr32(GRC_MISC_CFG) & ~GRC_MISC_CFG_PRESCALAR_MASK;
+ val |= (scale << GRC_MISC_CFG_PRESCALAR_SHIFT);
+ tw32(GRC_MISC_CFG, val);
+ }
+
if (tp->link_config.active_speed == SPEED_1000 &&
tp->link_config.active_duplex == DUPLEX_HALF)
tw32(MAC_TX_LENGTHS,