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tg3: Ensure boot code has completed initialization before accessing hardware 

After resetting the device, the driver waits for a signature to be
updated to know that firmware has completed initialization. However, the
call to tg3_poll_fw() is being done too late and we're writing to the
GRC_MODE register before it has completely initialized, causing
contention with firmware.  This logic has existed since day one but is
causing PCIE link to go down randomly at startup on one platform once
every few hundred reboots.

Move the tg3_poll_fw() up to before we write to the GRC_MODE register
after reset.

Signed-off-by: Nithin Nayak Sujir <nsujir@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nithin Sujir 2013-05-21 12:57:32 +00:00 committed by David S. Miller
parent 3ccfc1b1d2
commit fb03a43f5f
1 changed files with 4 additions and 4 deletions
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8
drivers/net/ethernet/broadcom/tg3.c
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@ -8911,6 +8911,10 @@ static int tg3_chip_reset(struct tg3 *tp)
tg3_halt_cpu(tp, RX_CPU_BASE);
}
err = tg3_poll_fw(tp);
if (err)
return err;
tw32(GRC_MODE, tp->grc_mode);
if (tg3_chip_rev_id(tp) == CHIPREV_ID_5705_A0) {
@ -8941,10 +8945,6 @@ static int tg3_chip_reset(struct tg3 *tp)
tg3_ape_unlock(tp, TG3_APE_LOCK_GRC);
err = tg3_poll_fw(tp);
if (err)
return err;
tg3_mdio_start(tp);
if (tg3_flag(tp, PCI_EXPRESS) &&