tg3: Disable CLKREQ in L2
This patch disables CLKREQ in L2 to workaround a chipset bug.
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 460a0c2..4ae01b3 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -7642,6 +7642,20 @@
tw32(GRC_MODE, grc_mode);
}
+ if (tp->pci_chip_rev_id == CHIPREV_ID_57765_A0) {
+ u32 grc_mode = tr32(GRC_MODE);
+
+ /* Access the lower 1K of PL PCIE block registers. */
+ val = grc_mode & ~GRC_MODE_PCIE_PORT_MASK;
+ tw32(GRC_MODE, val | GRC_MODE_PCIE_PL_SEL);
+
+ val = tr32(TG3_PCIE_TLDLPL_PORT + TG3_PCIE_PL_LO_PHYCTL5);
+ tw32(TG3_PCIE_TLDLPL_PORT + TG3_PCIE_PL_LO_PHYCTL5,
+ val | TG3_PCIE_PL_LO_PHYCTL5_DIS_L2CLKREQ);
+
+ tw32(GRC_MODE, grc_mode);
+ }
+
/* This works around an issue with Athlon chipsets on
* B3 tigon3 silicon. This bit has no effect on any
* other revision. But do not set this on PCI Express
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index 5d7f72a..8a6012a 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -1854,6 +1854,8 @@
#define TG3_PCIE_TLDLPL_PORT 0x00007c00
#define TG3_PCIE_PL_LO_PHYCTL1 0x00000004
#define TG3_PCIE_PL_LO_PHYCTL1_L1PLLPD_EN 0x00001000
+#define TG3_PCIE_PL_LO_PHYCTL5 0x00000014
+#define TG3_PCIE_PL_LO_PHYCTL5_DIS_L2CLKREQ 0x80000000
/* OTP bit definitions */
#define TG3_OTP_AGCTGT_MASK 0x000000e0