This is a note to let you know that I've just added the patch titled
ixgbe: Reduce I2C retry count on X550 devices
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ixgbe-reduce-i2c-retry-count-on-x550-devices.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Sun Nov 19 12:02:55 CET 2017
From: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
Date: Thu, 10 Nov 2016 09:57:29 -0800
Subject: ixgbe: Reduce I2C retry count on X550 devices
From: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
[ Upstream commit 3f0d646b720d541309b11e190db58086f446f41e ]
A retry count of 10 is likely to run into problems on X550 devices that
have to detect and reset unresponsive CS4227 devices. So, reduce the I2C
retry count to 3 for X550 and above. This should avoid any possible
regressions in existing devices.
Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
Tested-by: Andrew Bowers <andrewx.bowers@xxxxxxxxx>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
@@ -113,7 +113,7 @@ static s32 ixgbe_read_i2c_combined_gener
u16 reg, u16 *val, bool lock)
{
u32 swfw_mask = hw->phy.phy_semaphore_mask;
- int max_retry = 10;
+ int max_retry = 3;
int retry = 0;
u8 csum_byte;
u8 high_bits;
@@ -1764,6 +1764,8 @@ static s32 ixgbe_read_i2c_byte_generic_i
u32 swfw_mask = hw->phy.phy_semaphore_mask;
bool nack = true;
+ if (hw->mac.type >= ixgbe_mac_X550)
+ max_retry = 3;
if (ixgbe_is_sfp_probe(hw, byte_offset, dev_addr))
max_retry = IXGBE_SFP_DETECT_RETRIES;
Patches currently in stable-queue which might be from anthony.l.nguyen@xxxxxxxxx are
queue-4.4/ixgbe-reduce-i2c-retry-count-on-x550-devices.patch