UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

ixgbe: cleanup handling of I2C interface to PHY 

The I2C interface was not being correctly locked down per port.  As such
this can lead to race conditions that can cause issues.  This patch cleans
up the handling to make certain we are not experiencing racy I2C access.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Emil Tantilov 2011-02-19 08:43:55 +00:00 committed by Jeff Kirsher
parent 278675d855
commit 75f19c3c5e
1 changed files with 38 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/net/ixgbe/ixgbe_phy.c
View File

@ -858,6 +858,9 @@ err_read_i2c_eeprom:
* @hw: pointer to hardware structure
* @list_offset: offset to the SFP ID list
* @data_offset: offset to the SFP data block
*
* Checks the MAC's EEPROM to see if it supports a given SFP+ module type, if
* so it returns the offsets to the phy init sequence block.
**/
s32 ixgbe_get_sfp_init_sequence_offsets(struct ixgbe_hw *hw,
u16 *list_offset,
@ -972,11 +975,22 @@ s32 ixgbe_read_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
u8 dev_addr, u8 *data)
{
s32 status = 0;
u32 max_retry = 1;
u32 max_retry = 10;
u32 retry = 0;
u16 swfw_mask = 0;
bool nack = 1;
if (IXGBE_READ_REG(hw, IXGBE_STATUS) & IXGBE_STATUS_LAN_ID_1)
swfw_mask = IXGBE_GSSR_PHY1_SM;
else
swfw_mask = IXGBE_GSSR_PHY0_SM;
do {
if (ixgbe_acquire_swfw_sync(hw, swfw_mask) != 0) {
status = IXGBE_ERR_SWFW_SYNC;
goto read_byte_out;
}
ixgbe_i2c_start(hw);
/* Device Address and write indication */
@ -1019,6 +1033,8 @@ s32 ixgbe_read_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
break;
fail:
ixgbe_release_swfw_sync(hw, swfw_mask);
msleep(100);
ixgbe_i2c_bus_clear(hw);
retry++;
if (retry < max_retry)
@ -1028,6 +1044,9 @@ fail:
} while (retry < max_retry);
ixgbe_release_swfw_sync(hw, swfw_mask);
read_byte_out:
return status;
}
@ -1046,6 +1065,17 @@ s32 ixgbe_write_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
s32 status = 0;
u32 max_retry = 1;
u32 retry = 0;
u16 swfw_mask = 0;
if (IXGBE_READ_REG(hw, IXGBE_STATUS) & IXGBE_STATUS_LAN_ID_1)
swfw_mask = IXGBE_GSSR_PHY1_SM;
else
swfw_mask = IXGBE_GSSR_PHY0_SM;
if (ixgbe_acquire_swfw_sync(hw, swfw_mask) != 0) {
status = IXGBE_ERR_SWFW_SYNC;
goto write_byte_out;
}
do {
ixgbe_i2c_start(hw);
@ -1086,6 +1116,9 @@ fail:
hw_dbg(hw, "I2C byte write error.\n");
} while (retry < max_retry);
ixgbe_release_swfw_sync(hw, swfw_mask);
write_byte_out:
return status;
}
@ -1404,6 +1437,8 @@ static void ixgbe_i2c_bus_clear(struct ixgbe_hw *hw)
u32 i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL);
u32 i;
ixgbe_i2c_start(hw);
ixgbe_set_i2c_data(hw, &i2cctl, 1);
for (i = 0; i < 9; i++) {
@ -1418,6 +1453,8 @@ static void ixgbe_i2c_bus_clear(struct ixgbe_hw *hw)
udelay(IXGBE_I2C_T_LOW);
}
ixgbe_i2c_start(hw);
/* Put the i2c bus back to default state */
ixgbe_i2c_stop(hw);
}