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authorMatt Carlson <mcarlson@broadcom.com>2007-11-12 21:18:04 -0800
committerDavid S. Miller <davem@davemloft.net>2007-11-12 21:18:04 -0800
commitaa6c91fe5913faa2cd2a62de993a3130799412b1 (patch)
treee3b320593d68b4542beedf496b365378519fb2d2 /drivers/net/tg3.c
parent5f60891b80f1a0f0a0015b084f4838ae8b9637c7 (diff)
[TG3]: Prescaler fix
Internal hardware timers become inaccurate after link events. Clock frequency switches performed by the CPMU fail to adjust timer prescalers. The fix is to detect core clock frequency changes during link events and adjust the timer prescalers accordingly. Signed-off-by: Matt Carlson <mcarlson@broadcom.com> Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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 bb3b7343517..ecd64a224e9 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,