| Message ID | f9db7f54d12e2589bcbb39215049d51a762d5d75.1441731619.git.poh@qca.qualcomm.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Delegated to: | Kalle Valo |
| Headers | show |
Peter Oh <poh@qca.qualcomm.com> writes: > 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 <poh@qca.qualcomm.com> A changelog would be good to have. What changed in v2?
diff --git a/drivers/net/wireless/ath/dfs_pattern_detector.c b/drivers/net/wireless/ath/dfs_pattern_detector.c index 656ce42..0cc89fd 100644 --- a/drivers/net/wireless/ath/dfs_pattern_detector.c +++ b/drivers/net/wireless/ath/dfs_pattern_detector.c @@ -21,12 +21,6 @@ #include "dfs_pri_detector.h" #include "ath.h" -/* - * tolerated deviation of radar time stamp in usecs on both sides - * TODO: this might need to be HW-dependent - */ -#define PRI_TOLERANCE 16 - /** * struct radar_types - contains array of patterns defined for one DFS domain * @domain: DFS regulatory domain diff --git a/drivers/net/wireless/ath/dfs_pattern_detector.h b/drivers/net/wireless/ath/dfs_pattern_detector.h index 25a43d6..92be353 100644 --- a/drivers/net/wireless/ath/dfs_pattern_detector.h +++ b/drivers/net/wireless/ath/dfs_pattern_detector.h @@ -21,6 +21,11 @@ #include <linux/list.h> #include <linux/nl80211.h> +/* 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 */ diff --git a/drivers/net/wireless/ath/dfs_pri_detector.c b/drivers/net/wireless/ath/dfs_pri_detector.c index cc5c592..05b0464 100644 --- a/drivers/net/wireless/ath/dfs_pri_detector.c +++ b/drivers/net/wireless/ath/dfs_pri_detector.c @@ -25,6 +25,9 @@ struct ath_dfs_pool_stats global_dfs_pool_stats = {}; #define DFS_POOL_STAT_INC(c) (global_dfs_pool_stats.c++) #define DFS_POOL_STAT_DEC(c) (global_dfs_pool_stats.c--) +#define GET_PRI_TO_USE(MIN, MAX, RUNTIME) \ + (MIN + PRI_TOLERANCE == MAX - PRI_TOLERANCE ? \ + MIN + PRI_TOLERANCE : RUNTIME) /** * struct pulse_elem - elements in pulse queue @@ -243,7 +246,8 @@ static bool pseq_handler_create_sequences(struct pri_detector *pde, ps.count_falses = 0; ps.first_ts = p->ts; ps.last_ts = ts; - ps.pri = ts - p->ts; + ps.pri = GET_PRI_TO_USE(pde->rs->pri_min, + pde->rs->pri_max, ts - p->ts); ps.dur = ps.pri * (pde->rs->ppb - 1) + 2 * pde->rs->max_pri_tolerance;
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 <poh@qca.qualcomm.com> --- drivers/net/wireless/ath/dfs_pattern_detector.c | 6 ------ drivers/net/wireless/ath/dfs_pattern_detector.h | 5 +++++ drivers/net/wireless/ath/dfs_pri_detector.c | 6 +++++- 3 files changed, 10 insertions(+), 7 deletions(-)