Commit 1d5846b9 authored by Bruce Allan's avatar Bruce Allan Committed by David S. Miller
Browse files

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

This patch reworks a previous workaround (commit 7d3cabbc

) 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: default avatarBruce Allan <bruce.w.allan@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f523d211
......@@ -76,6 +76,7 @@
/* Extended Device Control */
#define E1000_CTRL_EXT_SDP7_DATA 0x00000080 /* Value of SW Definable Pin 7 */
#define E1000_CTRL_EXT_EE_RST 0x00002000 /* Reinitialize from EEPROM */
#define E1000_CTRL_EXT_SPD_BYPS 0x00008000 /* Speed Select Bypass */
#define E1000_CTRL_EXT_RO_DIS 0x00020000 /* Relaxed Ordering disable */
#define E1000_CTRL_EXT_DMA_DYN_CLK_EN 0x00080000 /* DMA Dynamic Clock Gating */
#define E1000_CTRL_EXT_LINK_MODE_MASK 0x00C00000
......
......@@ -141,6 +141,20 @@ struct e1000_info;
#define HV_TNCRS_UPPER PHY_REG(778, 29) /* Transmit with no CRS */
#define HV_TNCRS_LOWER PHY_REG(778, 30)
/* BM PHY Copper Specific Status */
#define BM_CS_STATUS 17
#define BM_CS_STATUS_LINK_UP 0x0400
#define BM_CS_STATUS_RESOLVED 0x0800
#define BM_CS_STATUS_SPEED_MASK 0xC000
#define BM_CS_STATUS_SPEED_1000 0x8000
/* 82577 Mobile Phy Status Register */
#define HV_M_STATUS 26
#define HV_M_STATUS_AUTONEG_COMPLETE 0x1000
#define HV_M_STATUS_SPEED_MASK 0x0300
#define HV_M_STATUS_SPEED_1000 0x0200
#define HV_M_STATUS_LINK_UP 0x0040
enum e1000_boards {
board_82571,
board_82572,
......
......@@ -903,6 +903,7 @@ struct e1000_shadow_ram {
struct e1000_dev_spec_ich8lan {
bool kmrn_lock_loss_workaround_enabled;
struct e1000_shadow_ram shadow_ram[E1000_ICH8_SHADOW_RAM_WORDS];
bool nvm_k1_enabled;
};
struct e1000_hw {
......
......@@ -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)) {
......
......@@ -95,13 +95,6 @@ static const u16 e1000_igp_2_cable_length_table[] =
/* BM PHY Copper Specific Control 1 */
#define BM_CS_CTRL1 16
/* BM PHY Copper Specific Status */
#define BM_CS_STATUS 17
#define BM_CS_STATUS_LINK_UP 0x0400
#define BM_CS_STATUS_RESOLVED 0x0800
#define BM_CS_STATUS_SPEED_MASK 0xC000
#define BM_CS_STATUS_SPEED_1000 0x8000
#define HV_MUX_DATA_CTRL PHY_REG(776, 16)
#define HV_MUX_DATA_CTRL_GEN_TO_MAC 0x0400
#define HV_MUX_DATA_CTRL_FORCE_SPEED 0x0004
......@@ -563,7 +556,7 @@ s32 e1000e_read_kmrn_reg(struct e1000_hw *hw, u32 offset, u16 *data)
}
/**
* e1000_read_kmrn_reg_locked - Read kumeran register
* e1000e_read_kmrn_reg_locked - Read kumeran register
* @hw: pointer to the HW structure
* @offset: register offset to be read
* @data: pointer to the read data
......@@ -572,7 +565,7 @@ s32 e1000e_read_kmrn_reg(struct e1000_hw *hw, u32 offset, u16 *data)
* information retrieved is stored in data.
* Assumes semaphore already acquired.
**/
s32 e1000_read_kmrn_reg_locked(struct e1000_hw *hw, u32 offset, u16 *data)
s32 e1000e_read_kmrn_reg_locked(struct e1000_hw *hw, u32 offset, u16 *data)
{
return __e1000_read_kmrn_reg(hw, offset, data, true);
}
......@@ -631,7 +624,7 @@ s32 e1000e_write_kmrn_reg(struct e1000_hw *hw, u32 offset, u16 data)
}
/**
* e1000_write_kmrn_reg_locked - Write kumeran register
* e1000e_write_kmrn_reg_locked - Write kumeran register
* @hw: pointer to the HW structure
* @offset: register offset to write to
* @data: data to write at register offset
......@@ -639,7 +632,7 @@ s32 e1000e_write_kmrn_reg(struct e1000_hw *hw, u32 offset, u16 data)
* Write the data to PHY register at the offset using the kumeran interface.
* Assumes semaphore already acquired.
**/
s32 e1000_write_kmrn_reg_locked(struct e1000_hw *hw, u32 offset, u16 data)
s32 e1000e_write_kmrn_reg_locked(struct e1000_hw *hw, u32 offset, u16 data)
{
return __e1000_write_kmrn_reg(hw, offset, data, true);
}
......
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