qca-wifi: Use precac entry's BW instead of hardcoded values

While determining the preCAC entry in which a channel falls
under, the range of the entry is calculated from the center frequency
and the hardcoded offset of +- 75 (for 160 MHz).

In certain RDPs which supports only a maximum of 80MHz, the
entries have a range of +- 40MHz from the center, but since this value
is always hardcoded to +- 75MHz, certain channels are wrongly
misinterpreted to fall in a preCAC entry even though the entries
do not have that channel.

To avoid such anamolies, use the precac entry's BW value to
determine the range of the entry instead of hardcoding it to
+- 75MHz (offset for 160MHz/165MHz).

CRs-Fixed: 2684927
Change-Id: I412cd433d50bad82e45af1d9f34bcd566381eccf

umac/dfs/core/src/misc/dfs_zero_cac.c

@@ -540,6 +540,9 @@ dfs_find_cac_status_for_chan_for_freq(struct dfs_precac_entry *precac_entry,
 #define IS_WITHIN_RANGE(_A, _B, _C)  \
 	(((_A) >= ((_B)-(_C))) && ((_A) <= ((_B)+(_C))))
 
+#define IS_WITHIN_RANGE_STRICT(_A, _B, _C)  \
+	(((_A) > ((_B)-(_C))) && ((_A) < ((_B)+(_C))))
+
 #ifdef CONFIG_CHAN_NUM_API
 bool dfs_is_precac_done_on_ht20_40_80_chan(struct wlan_dfs *dfs,
 					   uint8_t chan)
@@ -599,9 +602,9 @@ dfs_is_precac_done_on_ht20_40_80_160_165_chan_for_freq(struct wlan_dfs *dfs,
 			/* Find if the channel frequency is
 			 * in this precac_list.
 			 */
-			if (IS_WITHIN_RANGE(chan_freq,
-					    precac_entry->center_ch_freq,
-					    VHT160_FREQ_OFFSET)) {
+			if (IS_WITHIN_RANGE_STRICT(chan_freq,
+					precac_entry->center_ch_freq,
+					(precac_entry->bw/2))) {
 				ret_val = dfs_find_cac_status_for_chan_for_freq(
 						precac_entry, chan_freq);
 				break;
@@ -1391,9 +1394,9 @@ void dfs_mark_precac_done_for_freq(struct wlan_dfs *dfs,
 				   &dfs->dfs_precac_list,
 				   pe_list,
 				   tmp_precac_entry) {
-			if (IS_WITHIN_RANGE(channels[i],
-					    precac_entry->center_ch_freq,
-					    VHT160_FREQ_OFFSET)) {
+			if (IS_WITHIN_RANGE_STRICT(channels[i],
+					precac_entry->center_ch_freq,
+					(precac_entry->bw/2))) {
 				dfs_mark_tree_node_as_cac_done_for_freq
 					(dfs, precac_entry, channels[i]);
 				break;
@@ -1638,9 +1641,9 @@ void dfs_unmark_precac_nol_for_freq(struct wlan_dfs *dfs, uint16_t chan_freq)
 	if (!TAILQ_EMPTY(&dfs->dfs_precac_list)) {
 		TAILQ_FOREACH_SAFE(pcac_entry, &dfs->dfs_precac_list,
 				   pe_list, tmp_precac_entry) {
-			if (IS_WITHIN_RANGE(chan_freq,
-					    pcac_entry->center_ch_freq,
-					    VHT160_FREQ_OFFSET)) {
+			if (IS_WITHIN_RANGE_STRICT(chan_freq,
+					pcac_entry->center_ch_freq,
+					(pcac_entry->bw/2))) {
 				dfs_unmark_tree_node_as_nol_for_freq(dfs,
 								     pcac_entry,
 								     chan_freq);
@@ -1865,9 +1868,9 @@ void dfs_mark_precac_nol_for_freq(struct wlan_dfs *dfs,
 				   &dfs->dfs_precac_list,
 				   pe_list,
 				   tmp_precac_entry) {
-			if (IS_WITHIN_RANGE(freq_lst[i],
-					    precac_entry->center_ch_freq,
-					    VHT160_FREQ_OFFSET)) {
+			if (IS_WITHIN_RANGE_STRICT(freq_lst[i],
+					precac_entry->center_ch_freq,
+					(precac_entry->bw/2))) {
 				dfs_mark_tree_node_as_nol_for_freq(dfs,
 								   precac_entry,
 								   freq_lst[i]);