[dpdk-dev] [PATCH 08/26] ixgbe/base: reduce I2C retry count on X550 devices

[Wenzhuo Lu]

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: Wenzhuo Lu <wenzhuo.lu at intel.com>
---
 drivers/net/ixgbe/base/ixgbe_phy.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ixgbe/base/ixgbe_phy.c 
b/drivers/net/ixgbe/base/ixgbe_phy.c
index eb89071..e5ededb 100644
--- a/drivers/net/ixgbe/base/ixgbe_phy.c
+++ b/drivers/net/ixgbe/base/ixgbe_phy.c
@@ -121,6 +121,8 @@ STATIC s32 ixgbe_read_i2c_combined_generic_int(struct 
ixgbe_hw *hw, u8 addr,
        u8 reg_high;
        u8 csum;

+       if (hw->mac.type >= ixgbe_mac_X550)
+               max_retry = 3;
        reg_high = ((reg >> 7) & 0xFE) | 1;     /* Indicate read combined */
        csum = ixgbe_ones_comp_byte_add(reg_high, reg & 0xFF);
        csum = ~csum;
@@ -2045,6 +2047,8 @@ STATIC s32 ixgbe_read_i2c_byte_generic_int(struct 
ixgbe_hw *hw, u8 byte_offset,

        DEBUGFUNC("ixgbe_read_i2c_byte_generic");

+       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;

-- 
1.9.3