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Date: Tue, 08 Dec 2009 09:28:20 -0800
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, gospo@...hat.com,
Bruce Allan <bruce.w.allan@...el.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [PATCH 3/3] e1000e: only perform ESB2 MDIC workaround on certain
configurations
From: Bruce Allan <bruce.w.allan@...el.com>
A workaround added for all ESB2 devices (adds a delay for all MDIC accesses
which resolves an issue with the MDIC ready bit being set prematurely) is
applicable only to devices in which the MAC-PHY interconnect is not
operating in a certain mode with in-band MDIO. Check the control register
for the operating mode and enable the workaround accordingly.
Signed-off-by: Bruce Allan <bruce.w.allan@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/e1000e/es2lan.c | 97 ++++++++++++++++++++++++++++---------------
drivers/net/e1000e/hw.h | 5 ++
2 files changed, 69 insertions(+), 33 deletions(-)
diff --git a/drivers/net/e1000e/es2lan.c b/drivers/net/e1000e/es2lan.c
index d2a1047..3028f23 100644
--- a/drivers/net/e1000e/es2lan.c
+++ b/drivers/net/e1000e/es2lan.c
@@ -46,6 +46,9 @@
#define E1000_KMRNCTRLSTA_HD_CTRL_1000_DEFAULT 0x0000
#define E1000_KMRNCTRLSTA_OPMODE_E_IDLE 0x2000
+#define E1000_KMRNCTRLSTA_OPMODE_MASK 0x000C
+#define E1000_KMRNCTRLSTA_OPMODE_INBAND_MDIO 0x0004
+
#define E1000_TCTL_EXT_GCEX_MASK 0x000FFC00 /* Gigabit Carry Extend Padding */
#define DEFAULT_TCTL_EXT_GCEX_80003ES2LAN 0x00010000
@@ -462,28 +465,36 @@ static s32 e1000_read_phy_reg_gg82563_80003es2lan(struct e1000_hw *hw,
return ret_val;
}
- /*
- * The "ready" bit in the MDIC register may be incorrectly set
- * before the device has completed the "Page Select" MDI
- * transaction. So we wait 200us after each MDI command...
- */
- udelay(200);
+ if (hw->dev_spec.e80003es2lan.mdic_wa_enable == true) {
+ /*
+ * The "ready" bit in the MDIC register may be incorrectly set
+ * before the device has completed the "Page Select" MDI
+ * transaction. So we wait 200us after each MDI command...
+ */
+ udelay(200);
- /* ...and verify the command was successful. */
- ret_val = e1000e_read_phy_reg_mdic(hw, page_select, &temp);
+ /* ...and verify the command was successful. */
+ ret_val = e1000e_read_phy_reg_mdic(hw, page_select, &temp);
- if (((u16)offset >> GG82563_PAGE_SHIFT) != temp) {
- ret_val = -E1000_ERR_PHY;
- e1000_release_phy_80003es2lan(hw);
- return ret_val;
- }
+ if (((u16)offset >> GG82563_PAGE_SHIFT) != temp) {
+ ret_val = -E1000_ERR_PHY;
+ e1000_release_phy_80003es2lan(hw);
+ return ret_val;
+ }
- udelay(200);
+ udelay(200);
- ret_val = e1000e_read_phy_reg_mdic(hw, MAX_PHY_REG_ADDRESS & offset,
- data);
+ ret_val = e1000e_read_phy_reg_mdic(hw,
+ MAX_PHY_REG_ADDRESS & offset,
+ data);
+
+ udelay(200);
+ } else {
+ ret_val = e1000e_read_phy_reg_mdic(hw,
+ MAX_PHY_REG_ADDRESS & offset,
+ data);
+ }
- udelay(200);
e1000_release_phy_80003es2lan(hw);
return ret_val;
@@ -526,28 +537,35 @@ static s32 e1000_write_phy_reg_gg82563_80003es2lan(struct e1000_hw *hw,
return ret_val;
}
+ if (hw->dev_spec.e80003es2lan.mdic_wa_enable == true) {
+ /*
+ * The "ready" bit in the MDIC register may be incorrectly set
+ * before the device has completed the "Page Select" MDI
+ * transaction. So we wait 200us after each MDI command...
+ */
+ udelay(200);
- /*
- * The "ready" bit in the MDIC register may be incorrectly set
- * before the device has completed the "Page Select" MDI
- * transaction. So we wait 200us after each MDI command...
- */
- udelay(200);
+ /* ...and verify the command was successful. */
+ ret_val = e1000e_read_phy_reg_mdic(hw, page_select, &temp);
- /* ...and verify the command was successful. */
- ret_val = e1000e_read_phy_reg_mdic(hw, page_select, &temp);
+ if (((u16)offset >> GG82563_PAGE_SHIFT) != temp) {
+ e1000_release_phy_80003es2lan(hw);
+ return -E1000_ERR_PHY;
+ }
- if (((u16)offset >> GG82563_PAGE_SHIFT) != temp) {
- e1000_release_phy_80003es2lan(hw);
- return -E1000_ERR_PHY;
- }
+ udelay(200);
- udelay(200);
+ ret_val = e1000e_write_phy_reg_mdic(hw,
+ MAX_PHY_REG_ADDRESS & offset,
+ data);
- ret_val = e1000e_write_phy_reg_mdic(hw, MAX_PHY_REG_ADDRESS & offset,
- data);
+ udelay(200);
+ } else {
+ ret_val = e1000e_write_phy_reg_mdic(hw,
+ MAX_PHY_REG_ADDRESS & offset,
+ data);
+ }
- udelay(200);
e1000_release_phy_80003es2lan(hw);
return ret_val;
@@ -866,6 +884,19 @@ static s32 e1000_init_hw_80003es2lan(struct e1000_hw *hw)
reg_data &= ~0x00100000;
E1000_WRITE_REG_ARRAY(hw, E1000_FFLT, 0x0001, reg_data);
+ /* default to true to enable the MDIC W/A */
+ hw->dev_spec.e80003es2lan.mdic_wa_enable = true;
+
+ ret_val = e1000_read_kmrn_reg_80003es2lan(hw,
+ E1000_KMRNCTRLSTA_OFFSET >>
+ E1000_KMRNCTRLSTA_OFFSET_SHIFT,
+ &i);
+ if (!ret_val) {
+ if ((i & E1000_KMRNCTRLSTA_OPMODE_MASK) ==
+ E1000_KMRNCTRLSTA_OPMODE_INBAND_MDIO)
+ hw->dev_spec.e80003es2lan.mdic_wa_enable = false;
+ }
+
/*
* Clear all of the statistics registers (clear on read). It is
* important that we do this after we have tried to establish link
diff --git a/drivers/net/e1000e/hw.h b/drivers/net/e1000e/hw.h
index 5ed1788..2784cf4 100644
--- a/drivers/net/e1000e/hw.h
+++ b/drivers/net/e1000e/hw.h
@@ -900,6 +900,10 @@ struct e1000_dev_spec_82571 {
u32 smb_counter;
};
+struct e1000_dev_spec_80003es2lan {
+ bool mdic_wa_enable;
+};
+
struct e1000_shadow_ram {
u16 value;
bool modified;
@@ -928,6 +932,7 @@ struct e1000_hw {
union {
struct e1000_dev_spec_82571 e82571;
+ struct e1000_dev_spec_80003es2lan e80003es2lan;
struct e1000_dev_spec_ich8lan ich8lan;
} dev_spec;
};
--
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