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[net-next,3/8] tg3: Reduce 57765 core clock when link at 10Mbps

Message ID 1271091511-11173-4-git-send-email-mcarlson@broadcom.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Matt Carlson April 12, 2010, 4:58 p.m. UTC 
This patch reduces the core clock to 6.25MHz when operating at 10Mbps
link speed.  This is needed to prevent a bug that will ultimately cause
transmits to cease.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
---
 drivers/net/tg3.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
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Patch

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index a0ab89e..3e89323 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -7654,6 +7654,11 @@  static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
 		     val | TG3_PCIE_PL_LO_PHYCTL5_DIS_L2CLKREQ);
 
 		tw32(GRC_MODE, grc_mode);
+
+		val = tr32(TG3_CPMU_LSPD_10MB_CLK);
+		val &= ~CPMU_LSPD_10MB_MACCLK_MASK;
+		val |= CPMU_LSPD_10MB_MACCLK_6_25;
+		tw32(TG3_CPMU_LSPD_10MB_CLK, val);
 	}
 
 	/* This works around an issue with Athlon chipsets on