Remove another coverage test which causes problems. (#871)

Coverage is handled by modifying firmware state, and the driver stores
the values the first time it is set. When we reset this state might be lost
so it will be reloaded from the firmware. We set the coverage back to 0
so the reloaded value will be the default again.
We also remove a check which can fail incorrectly.

files/usr/local/bin/mgr/rssi_monitor_ath10k.lua

@@ -71,7 +71,23 @@ local station_zero = 0
 local log = aredn.log.open(logfile, 16000)
 
 local function reset_network()
+    local coverage
+    local f = io.popen("iw " .. phy .. " info")
+    if f then
+        for line in f:lines()
+        do
+            coverage = tonumber(line:match("Coverage class: (%d+)"))
+            if coverage then
+                os.execute("iw " .. phy .. " set coverage 0 > /dev/null 2>&1")
+                break
+            end
+        end
+        f:close()
+    end
     write_all("/sys/kernel/debug/ieee80211/" .. phy .. "/ath10k/simulate_fw_crash", "hw-restart")
+    if coverage then
+        os.execute("iw " .. phy .. " set coverage " .. coverage .. " > /dev/null 2>&1")
+    end
 end
 
 function run_monitor_10k()

patches/742-5-and-10mhz-ath10k-ct-support.patch

@@ -277,13 +277,23 @@ Index: openwrt/package/kernel/ath10k-ct/patches/999-0002-ath10k-5_10Mhz.patch
 +  * OUI specified by WMI_SCAN_PROB_REQ_OUI_CMDID to the Probe Request frame.
 --- /dev/null
 +++ openwrt/package/kernel/ath10k-ct/patches/999-0004-ath10k-coverage.patch
-@@ -0,0 +1,16 @@
+@@ -0,0 +1,26 @@
 +--- a/ath10k-5.15/hw.c
 ++++ b/ath10k-5.15/hw.c
-+@@ -665,13 +665,6 @@
++@@ -655,23 +655,6 @@
++ 	slottime_reg = ar->fw_coverage.reg_slottime_orig;
++ 	timeout_reg = ar->fw_coverage.reg_ack_cts_timeout_orig;
 + 
-+ 	slottime = MS(slottime_reg, WAVE1_PCU_GBL_IFS_SLOT);
-+ 	slottime = slottime / phyclk;
++-	/* Do some sanity checks on the slottime register. */
++-	if (slottime_reg % phyclk) {
++-		ath10k_warn(ar,
++-			    "failed to set coverage class: expected integer microsecond value in register\n");
++-
++-		goto store_regs;
++-	}
++-
++-	slottime = MS(slottime_reg, WAVE1_PCU_GBL_IFS_SLOT);
++-	slottime = slottime / phyclk;
 +-	if (slottime != 9 && slottime != 20) {
 +-		ath10k_warn(ar,
 +-			    "failed to set coverage class: expected slot time of 9 or 20us in HW register. It is %uus.\n",