commit 0339e4e3effeae71e2b19c6340ef9672fb7a2cb3
author Matt Carlson <mcarlson@broadcom.com> Fri Feb 12 14:47:09 2010 +0000
committer David S. Miller <davem@davemloft.net> Fri Feb 12 17:05:53 2010 -0800
tree d54025d2a5ba9e9dd76e8cb736b673acafbf5b4b
parent 6b10c1653e425e30cff7f41d0e6f9743bfa9810f

tg3: Turn off multiple DMA reads for 5717

The 5717's DMA read engine has a bug when initiating multiple DMA reads
across the PCIe bus.  This patch disables the feature.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/tg3.c

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 2c5e1b7..673ea31 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -7915,6 +7915,9 @@
 		      RDMAC_MODE_FIFOURUN_ENAB | RDMAC_MODE_FIFOOREAD_ENAB |
 		      RDMAC_MODE_LNGREAD_ENAB);
 
+	if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5717)
+		rdmac_mode |= RDMAC_MODE_MULT_DMA_RD_DIS;
+
 	if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5784 ||
 	    GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5785 ||
 	    GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_57780)