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mlx4_core: Wait 1 second after reset before accessing device

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Put a 1000 msec delay after resetting the device before attempting to
do config cycles on it.  Not waiting causes system hangs on some
chipsets, e.g. Intel E7520, when the driver is loaded.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Eli Cohen 2007-08-13 17:57:03 +03:00 committed by Roland Dreier
parent 6958e827f1
commit 947b2a8083
1 changed files with 3 additions and 0 deletions
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3
drivers/net/mlx4/reset.c
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@ -119,6 +119,9 @@ int mlx4_reset(struct mlx4_dev *dev)
writel(MLX4_RESET_VALUE, reset + MLX4_RESET_OFFSET);
iounmap(reset);
/* Docs say to wait one second before accessing device */
msleep(1000);
end = jiffies + MLX4_RESET_TIMEOUT_JIFFIES;
do {
if (!pci_read_config_word(dev->pdev, PCI_VENDOR_ID, &vendor) &&