ice: Remove the E822 vernier "bypass" logic

The E822 devices support an extended "vernier" calibration which enables
higher precision timestamps by accounting for delays in the PHY, and
compensating for them. These delays are measured by hardware as part of its
vernier calibration logic.

The driver currently starts the PHY in "bypass" mode which skips
the compensation. Then it later attempts to switch from bypass to vernier.
This unfortunately does not work as expected. Instead of properly
compensating for the delays, the hardware continues operating in bypass
without the improved precision expected.

Because we cannot dynamically switch between bypass and vernier mode,
refactor the driver to always operate in vernier mode. This has a slight
downside: Tx timestamp and Rx timestamp requests that occur as the very
first packet set after link up will not complete properly and may be
reported to applications as missing timestamps.

This occurs frequently in test environments where traffic is light or
targeted specifically at testing PTP. However, in practice most
environments will have transmitted or received some data over the network
before such initial requests are made.

Signed-off-by: Milena Olech <milena.olech@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp_hw.h b/drivers/net/ethernet/intel/ice/ice_ptp_hw.h
index 2bda64c76abc..db4f57cb9ec9 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp_hw.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp_hw.h
@@ -184,8 +184,8 @@ static inline u64 ice_e822_pps_delay(enum ice_time_ref_freq time_ref)
 
 /* E822 Vernier calibration functions */
 int ice_stop_phy_timer_e822(struct ice_hw *hw, u8 port, bool soft_reset);
-int ice_start_phy_timer_e822(struct ice_hw *hw, u8 port, bool bypass);
-int ice_phy_exit_bypass_e822(struct ice_hw *hw, u8 port);
+int ice_start_phy_timer_e822(struct ice_hw *hw, u8 port);
+int ice_phy_calc_vernier_e822(struct ice_hw *hw, u8 port);
 
 /* E810 family functions */
 int ice_ptp_init_phy_e810(struct ice_hw *hw);