mac80211: ath10k: Limit available channels via DT ieee80211-freq-limit

Tri-band devices (1x 2.4GHz + 2x 5GHz) often incorporate special filters in
the RX and TX path. These filtered channel can in theory still be used by
the hardware but the signal strength is reduced so much that it makes no
sense.

There is already a DT property to limit the available channels but ath10k
has to manually call this functionality to limit the currrently set wiphy
channels further.

Signed-off-by: Sven Eckelmann <sven.eckelmann@openmesh.com>
(backported from ef39d0079b4efd18f0d39971c66989d5a6f34eca)
(rebased patches)
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

diff --git a/package/kernel/mac80211/patches/976-ath10k-Limit-available-channels-via-DT-ieee80211-fre.patch b/package/kernel/mac80211/patches/976-ath10k-Limit-available-channels-via-DT-ieee80211-fre.patch
new file mode 100644 (file)
index 0000000..ea57d11
--- /dev/null
+++ b/package/kernel/mac80211/patches/976-ath10k-Limit-available-channels-via-DT-ieee80211-fre.patch
@@ -0,0 +1,39 @@
+From bbf0a8af2261bc7ae39b227ff6a1e9f45a008c27 Mon Sep 17 00:00:00 2001
+From: Sven Eckelmann <sven.eckelmann@openmesh.com>
+Date: Mon, 30 Jul 2018 17:31:41 +0200
+Subject: [PATCH] ath10k: Limit available channels via DT ieee80211-freq-limit
+
+Tri-band devices (1x 2.4GHz + 2x 5GHz) often incorporate special filters in
+the RX and TX path. These filtered channel can in theory still be used by
+the hardware but the signal strength is reduced so much that it makes no
+sense.
+
+There is already a DT property to limit the available channels but ath10k
+has to manually call this functionality to limit the currrently set wiphy
+channels further.
+
+Signed-off-by: Sven Eckelmann <sven.eckelmann@openmesh.com>
+
+Forwarded: https://patchwork.kernel.org/patch/10549245/
+---
+ drivers/net/wireless/ath/ath10k/mac.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/drivers/net/wireless/ath/ath10k/mac.c
++++ b/drivers/net/wireless/ath/ath10k/mac.c
+@@ -17,6 +17,7 @@
+ 
+ #include "mac.h"
+ 
++#include <net/cfg80211.h>
+ #include <net/mac80211.h>
+ #include <linux/etherdevice.h>
+ #include <linux/acpi.h>
+@@ -8230,6 +8231,7 @@ int ath10k_mac_register(struct ath10k *a
+               ar->hw->wiphy->bands[NL80211_BAND_5GHZ] = band;
+       }
+ 
++      wiphy_read_of_freq_limits(ar->hw->wiphy);
+       ath10k_mac_setup_ht_vht_cap(ar);
+ 
+       ar->hw->wiphy->interface_modes =