From 44acedb00b6d4b56ddab04362ccfa133b0d3b013 Mon Sep 17 00:00:00 2001 From: Peter Oh Date: Thu, 17 Sep 2015 14:29:08 +0300 Subject: ath: use PRI value given by spec for fixed PRI PRI value is used as divider when DFS detector analyzes candidate radar pulses. If PRI deviation is big from its origin PRI, DFS detector could miss valid radar reports since HW often misses detecting radar pulses and causes long interval value of pulses. For instance from practical results, if runtime PRI is calculated as 1431 for fixed PRI value of 1428 and delta timestamp logs 15719, the modular remainder will be 1409 and the delta between the remainder and runtime PRI is 22 that is bigger than PRI tolerance which is 16. As a result this radar report will be ignored even though it's valid. By using spec defined PRI for fixed PRI, we can correct this error. Signed-off-by: Peter Oh Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/dfs_pattern_detector.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/net/wireless/ath/dfs_pattern_detector.h') diff --git a/drivers/net/wireless/ath/dfs_pattern_detector.h b/drivers/net/wireless/ath/dfs_pattern_detector.h index 25a43d632f90..92be3530e9b5 100644 --- a/drivers/net/wireless/ath/dfs_pattern_detector.h +++ b/drivers/net/wireless/ath/dfs_pattern_detector.h @@ -21,6 +21,11 @@ #include #include +/* tolerated deviation of radar time stamp in usecs on both sides + * TODO: this might need to be HW-dependent + */ +#define PRI_TOLERANCE 16 + /** * struct ath_dfs_pool_stats - DFS Statistics for global pools */ -- cgit v1.2.1