wifi: iwlwifi: mvm: select ptp cross timestamp from multiple reads

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iwl_mvm_get_sync_time() reads the gp2 from the device and then
reads the system clock. Since the two reads are not done atomically,
unexpected delays may happen between the two reads (e.g. context
switch) which make it inaccurate.
In order to improve the accuracy of the cross timestamp, call
iwl_mvm_get_sync_time() multiple times in a loop and take the
result in which the difference between the two clock is the smallest.

Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230320122330.d9e6f8f8998a.I569939ec4ddf0c6c64c112e7d0c30583f5509d9a@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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Avraham Stern 2023-03-20 12:33:08 +02:00 • committed by Johannes Berg

parent a2f49f7d52

commit e861033944

1 changed files with 25 additions and 2 deletions

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drivers/net/wireless/intel/iwlwifi/mvm/ptp.c

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