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e1000e: rework disable K1 at 1000Mbps for 82577/82578

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This patch reworks a previous workaround (commit 7d3cabbcc) for an issue
in hardware where noise on the interconnect between the MAC and PHY could
be generated by a lower power mode (K1) at 1000Mbps resulting in bad
packets.  Disable K1 while at 1000 Mbps but keep it enabled for 10/100Mbps
and when the cable is disconnected.  The original version of this
workaround was found to be incomplete.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bruce Allan
2009-10-29 13:46:05 +00:00
committed by David S. Miller
parent f523d2114e
commit 1d5846b921
5 changed files with 190 additions and 28 deletions
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187
drivers/net/e1000e/ich8lan.c
View File

@ -140,6 +140,9 @@
#define HV_OEM_BITS_GBE_DIS 0x0040 /* Gigabit Disable */
#define HV_OEM_BITS_RESTART_AN 0x0400 /* Restart Auto-negotiation */
#define E1000_NVM_K1_CONFIG 0x1B /* NVM K1 Config Word */
#define E1000_NVM_K1_ENABLE 0x1 /* NVM Enable K1 bit */
/* ICH GbE Flash Hardware Sequencing Flash Status Register bit breakdown */
/* Offset 04h HSFSTS */
union ich8_hws_flash_status {
@ -220,6 +223,8 @@ static s32 e1000_led_on_pchlan(struct e1000_hw *hw);
static s32 e1000_led_off_pchlan(struct e1000_hw *hw);
static s32 e1000_set_lplu_state_pchlan(struct e1000_hw *hw, bool active);
static void e1000_lan_init_done_ich8lan(struct e1000_hw *hw);
static s32 e1000_k1_gig_workaround_hv(struct e1000_hw *hw, bool link);
static s32 e1000_configure_k1_ich8lan(struct e1000_hw *hw, bool k1_enable);
static inline u16 __er16flash(struct e1000_hw *hw, unsigned long reg)
{
@ -495,14 +500,6 @@ static s32 e1000_check_for_copper_link_ich8lan(struct e1000_hw *hw)
goto out;
}
if (hw->mac.type == e1000_pchlan) {
ret_val = e1000e_write_kmrn_reg(hw,
E1000_KMRNCTRLSTA_K1_CONFIG,
E1000_KMRNCTRLSTA_K1_ENABLE);
if (ret_val)
goto out;
}
/*
* First we want to see if the MII Status Register reports
* link. If so, then we want to get the current speed/duplex
@ -512,6 +509,12 @@ static s32 e1000_check_for_copper_link_ich8lan(struct e1000_hw *hw)
if (ret_val)
goto out;
if (hw->mac.type == e1000_pchlan) {
ret_val = e1000_k1_gig_workaround_hv(hw, link);
if (ret_val)
goto out;
}
if (!link)
goto out; /* No link detected */
@ -928,6 +931,141 @@ out:
return ret_val;
}
/**
* e1000_k1_gig_workaround_hv - K1 Si workaround
* @hw: pointer to the HW structure
* @link: link up bool flag
*
* If K1 is enabled for 1Gbps, the MAC might stall when transitioning
* from a lower speed. This workaround disables K1 whenever link is at 1Gig
* If link is down, the function will restore the default K1 setting located
* in the NVM.
**/
static s32 e1000_k1_gig_workaround_hv(struct e1000_hw *hw, bool link)
{
s32 ret_val = 0;
u16 status_reg = 0;
bool k1_enable = hw->dev_spec.ich8lan.nvm_k1_enabled;
if (hw->mac.type != e1000_pchlan)
goto out;
/* Wrap the whole flow with the sw flag */
ret_val = hw->phy.ops.acquire_phy(hw);
if (ret_val)
goto out;
/* Disable K1 when link is 1Gbps, otherwise use the NVM setting */
if (link) {
if (hw->phy.type == e1000_phy_82578) {
ret_val = hw->phy.ops.read_phy_reg_locked(hw,
BM_CS_STATUS,
&status_reg);
if (ret_val)
goto release;
status_reg &= BM_CS_STATUS_LINK_UP |
BM_CS_STATUS_RESOLVED |
BM_CS_STATUS_SPEED_MASK;
if (status_reg == (BM_CS_STATUS_LINK_UP |
BM_CS_STATUS_RESOLVED |
BM_CS_STATUS_SPEED_1000))
k1_enable = false;
}
if (hw->phy.type == e1000_phy_82577) {
ret_val = hw->phy.ops.read_phy_reg_locked(hw,
HV_M_STATUS,
&status_reg);
if (ret_val)
goto release;
status_reg &= HV_M_STATUS_LINK_UP |
HV_M_STATUS_AUTONEG_COMPLETE |
HV_M_STATUS_SPEED_MASK;
if (status_reg == (HV_M_STATUS_LINK_UP |
HV_M_STATUS_AUTONEG_COMPLETE |
HV_M_STATUS_SPEED_1000))
k1_enable = false;
}
/* Link stall fix for link up */
ret_val = hw->phy.ops.write_phy_reg_locked(hw, PHY_REG(770, 19),
0x0100);
if (ret_val)
goto release;
} else {
/* Link stall fix for link down */
ret_val = hw->phy.ops.write_phy_reg_locked(hw, PHY_REG(770, 19),
0x4100);
if (ret_val)
goto release;
}
ret_val = e1000_configure_k1_ich8lan(hw, k1_enable);
release:
hw->phy.ops.release_phy(hw);
out:
return ret_val;
}
/**
* e1000_configure_k1_ich8lan - Configure K1 power state
* @hw: pointer to the HW structure
* @enable: K1 state to configure
*
* Configure the K1 power state based on the provided parameter.
* Assumes semaphore already acquired.
*
* Success returns 0, Failure returns -E1000_ERR_PHY (-2)
**/
static s32 e1000_configure_k1_ich8lan(struct e1000_hw *hw, bool k1_enable)
{
s32 ret_val = 0;
u32 ctrl_reg = 0;
u32 ctrl_ext = 0;
u32 reg = 0;
u16 kmrn_reg = 0;
ret_val = e1000e_read_kmrn_reg_locked(hw,
E1000_KMRNCTRLSTA_K1_CONFIG,
&kmrn_reg);
if (ret_val)
goto out;
if (k1_enable)
kmrn_reg |= E1000_KMRNCTRLSTA_K1_ENABLE;
else
kmrn_reg &= ~E1000_KMRNCTRLSTA_K1_ENABLE;
ret_val = e1000e_write_kmrn_reg_locked(hw,
E1000_KMRNCTRLSTA_K1_CONFIG,
kmrn_reg);
if (ret_val)
goto out;
udelay(20);
ctrl_ext = er32(CTRL_EXT);
ctrl_reg = er32(CTRL);
reg = ctrl_reg & ~(E1000_CTRL_SPD_1000 | E1000_CTRL_SPD_100);
reg |= E1000_CTRL_FRCSPD;
ew32(CTRL, reg);
ew32(CTRL_EXT, ctrl_ext | E1000_CTRL_EXT_SPD_BYPS);
udelay(20);
ew32(CTRL, ctrl_reg);
ew32(CTRL_EXT, ctrl_ext);
udelay(20);
out:
return ret_val;
}
/**
* e1000_oem_bits_config_ich8lan - SW-based LCD Configuration
* @hw: pointer to the HW structure
@ -1030,10 +1168,20 @@ static s32 e1000_hv_phy_workarounds_ich8lan(struct e1000_hw *hw)
ret_val = hw->phy.ops.acquire_phy(hw);
if (ret_val)
return ret_val;
hw->phy.addr = 1;
e1000e_write_phy_reg_mdic(hw, IGP01E1000_PHY_PAGE_SELECT, 0);
ret_val = e1000e_write_phy_reg_mdic(hw, IGP01E1000_PHY_PAGE_SELECT, 0);
if (ret_val)
goto out;
hw->phy.ops.release_phy(hw);
/*
* Configure the K1 Si workaround during phy reset assuming there is
* link so that it disables K1 if link is in 1Gbps.
*/
ret_val = e1000_k1_gig_workaround_hv(hw, true);
out:
return ret_val;
}
@ -2435,6 +2583,7 @@ static s32 e1000_get_bus_info_ich8lan(struct e1000_hw *hw)
**/
static s32 e1000_reset_hw_ich8lan(struct e1000_hw *hw)
{
struct e1000_dev_spec_ich8lan *dev_spec = &hw->dev_spec.ich8lan;
u16 reg;
u32 ctrl, icr, kab;
s32 ret_val;
@ -2470,6 +2619,18 @@ static s32 e1000_reset_hw_ich8lan(struct e1000_hw *hw)
ew32(PBS, E1000_PBS_16K);
}
if (hw->mac.type == e1000_pchlan) {
/* Save the NVM K1 bit setting*/
ret_val = e1000_read_nvm(hw, E1000_NVM_K1_CONFIG, 1, &reg);
if (ret_val)
return ret_val;
if (reg & E1000_NVM_K1_ENABLE)
dev_spec->nvm_k1_enabled = true;
else
dev_spec->nvm_k1_enabled = false;
}
ctrl = er32(CTRL);
if (!e1000_check_reset_block(hw)) {
@ -2847,14 +3008,6 @@ static s32 e1000_get_link_up_info_ich8lan(struct e1000_hw *hw, u16 *speed,
if (ret_val)
return ret_val;
if ((hw->mac.type == e1000_pchlan) && (*speed == SPEED_1000)) {
ret_val = e1000e_write_kmrn_reg(hw,
E1000_KMRNCTRLSTA_K1_CONFIG,
E1000_KMRNCTRLSTA_K1_DISABLE);
if (ret_val)
return ret_val;
}
if ((hw->mac.type == e1000_ich8lan) &&
(hw->phy.type == e1000_phy_igp_3) &&
(*speed == SPEED_1000)) {