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authorNithin Sujir <nsujir@broadcom.com>2013-06-12 11:08:59 -0700
committerBen Hutchings <ben@decadent.org.uk>2013-06-19 02:17:02 +0100
commit08647d0f99db39f73f37e00ebafc24ff3d3f4948 (patch)
tree81f7d100df4519c267b140d01445900382206e3b
parent58e06b1d5e77f6cbed3cddc39e7d782d462e1883 (diff)
downloadlwn-08647d0f99db39f73f37e00ebafc24ff3d3f4948.tar.gz
lwn-08647d0f99db39f73f37e00ebafc24ff3d3f4948.zip
tg3: Wait for boot code to finish after power on
commit df465abfe06f7dc4f33f4a96d17f096e9e8ac917 upstream. Some systems that don't need wake-on-lan may choose to power down the chip on system standby. Upon resume, the power on causes the boot code to startup and initialize the hardware. On one new platform, this is causing the device to go into a bad state due to a race between the driver and boot code, once every several hundred resumes. The same race exists on open since we come up from a power on. This patch adds a wait for boot code signature at the beginning of tg3_init_hw() which is common to both cases. If there has not been a power-off or the boot code has already completed, the signature will be present and poll_fw() returns immediately. Also return immediately if the device does not have firmware. 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> [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
-rw-r--r--drivers/net/ethernet/broadcom/tg3.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 59a5909a9d74..1bc927a768f1 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -1620,6 +1620,9 @@ static int tg3_poll_fw(struct tg3 *tp)
int i;
u32 val;
+ if (tg3_flag(tp, NO_FWARE_REPORTED))
+ return 0;
+
if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5906) {
/* Wait up to 20ms for init done. */
for (i = 0; i < 200; i++) {
@@ -9188,6 +9191,13 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
*/
static int tg3_init_hw(struct tg3 *tp, int reset_phy)
{
+ /* Chip may have been just powered on. If so, the boot code may still
+ * be running initialization. Wait for it to finish to avoid races in
+ * accessing the hardware.
+ */
+ tg3_enable_register_access(tp);
+ tg3_poll_fw(tp);
+
tg3_switch_clocks(tp);
tw32(TG3PCI_MEM_WIN_BASE_ADDR, 0);