cat /sys/kernel/debug/ieee80211/phy0/ath10k/fw_reset_stats
cat /sys/kernel/debug/ieee80211/phy0/ath10k/fw_stats
cat /sys/kernel/debug/ieee80211/phy1/ath10k/fw_reset_stats
cat /sys/kernel/debug/ieee80211/phy1/ath10k/fw_stats

running either fw_stats -- will spam log with -- until it drives you mad :-P
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0001:01:00.0: dropping fw peer stats
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0001:01:00.0: dropping fw peer stats

-------------------------------------------------
DD-WRT v3.0-r30082 std (c) 2016 NewMedia-NET GmbH
Release: 07/01/16
[    5.608679] Backport generated by backports.git backports-20160216-0-ge3c56e4
[    6.059164] ath10k_pci 0000:01:00.0: enabling device (0140 -> 0142)
[    6.059727] ath10k_pci 0000:01:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
[    6.194567] ath10k_pci 0000:01:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:01:00.0.bin failed with error -2
[    6.194619] ath10k_pci 0000:01:00.0: Falling back to user helper
[    6.536131] ath10k_pci 0000:01:00.0: qca99x0 hw2.0 target 0x01000000 chip_id 0x003801ff sub 168c:0002
[    6.536167] ath10k_pci 0000:01:00.0: kconfig debug 1 debugfs 1 tracing 0 dfs 0 testmode 0
[    6.545763] ath10k_pci 0000:01:00.0: firmware ver 10.4.1.00030-1 api 5 features no-p2p crc32 d2901e01
GOOD -- does NOT spam log
-------------------------------------------------

DD-WRT v3.0-r30805 std (c) 2016 NewMedia-NET GmbH
Release: 10/27/16
[    5.640365] Backport generated by backports.git backports-20160324-9-g0e38f5c
[    6.138470] ath10k_pci 0000:01:00.0: enabling device (0140 -> 0142)
[    6.139036] ath10k_pci 0000:01:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
[    6.273698] ath10k_pci 0000:01:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:01:00.0.bin failed with error -2
[    6.273803] ath10k_pci 0000:01:00.0: Falling back to user helper
[    6.561049] ath10k_pci 0000:01:00.0: qca99x0 hw2.0 target 0x01000000 chip_id 0x003801ff sub 168c:0002
[    6.561087] ath10k_pci 0000:01:00.0: kconfig debug 1 debugfs 1 tracing 0 dfs 0 testmode 0
[    6.571190] ath10k_pci 0000:01:00.0: firmware ver 10.4.3.00063 api 5 features no-p2p,peer-flow-ctrl crc32 a0d385ce
spams log over & over
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0001:01:00.0: dropping fw peer stats
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0001:01:00.0: dropping fw peer stats
----------

DD-WRT v3.0-r30590M kongat (c) 2016 NewMedia-NET GmbH
Release: 09/08/16
[    5.579504] Backport generated by backports.git backports-20160216-7-g5735958
[    5.997799] ath10k_pci 0000:01:00.0: enabling device (0140 -> 0142)
[    5.998372] ath10k_pci 0000:01:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
[    6.110916] ath10k_pci 0000:01:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:01:00.0.bin failed with error -2
[    6.111018] ath10k_pci 0000:01:00.0: Falling back to user helper
[    6.422595] ath10k_pci 0000:01:00.0: qca99x0 hw2.0 target 0x01000000 chip_id 0x003801ff sub 168c:0002
[    6.422633] ath10k_pci 0000:01:00.0: kconfig debug 1 debugfs 1 tracing 0 dfs 0 testmode 0
[    6.432771] ath10k_pci 0000:01:00.0: firmware ver 10.4.3.00063 api 5 features no-p2p,peer-flow-ctrl crc32 a0d385ce
spams log over & over
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0001:01:00.0: dropping fw peer stats
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0001:01:00.0: dropping fw peer stats
----------

DD-WRT v3.0-r31815M kongat (c) 2017 NewMedia-NET GmbH
Release: 04/04/17
[    6.822310] Backport generated by backports.git backports-20160324-13-g24da7d3c
[    7.380579] ath10k_pci 0000:01:00.0: enabling device (0140 -> 0142)
[    7.381165] ath10k_pci 0000:01:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
[    7.513469] ath10k_pci 0000:01:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:01:00.0.bin failed with error -2
[    7.513507] ath10k_pci 0000:01:00.0: Falling back to user helper
[    7.775830] ath10k_pci 0000:01:00.0: Unknown FW IE: 30
[    7.775864] ath10k_pci 0000:01:00.0: qca99x0 hw2.0 target 0x01000000 chip_id 0x003801ff sub 168c:0002
[    7.779865] ath10k_pci 0000:01:00.0: kconfig debug 1 debugfs 1 tracing 0 dfs 0 testmode 0
[    7.791114] ath10k_pci 0000:01:00.0: firmware ver 10.4.3-ct-fW-009-6cb0af2 api 5 features peer-flow-ctrl crc32 f95022af
spams log over & over
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0001:01:00.0: dropping fw peer stats
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0001:01:00.0: dropping fw peer stats
----------

DD-WRT v3.0-r31980M kongat (c) 2017 NewMedia-NET GmbH
Release: 05/11/17
[    7.163256] Backport generated by backports.git backports-20160324-13-g24da7d3c
[    7.705788] ath10k_pci 0000:01:00.0: enabling device (0140 -> 0142)
[    7.706319] ath10k_pci 0000:01:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
[    7.834224] ath10k_pci 0000:01:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:01:00.0.bin failed with error -2
[    7.834258] ath10k_pci 0000:01:00.0: Falling back to user helper
[    8.188290] ath10k_pci 0000:01:00.0: qca99x0 hw2.0 target 0x01000000 chip_id 0x003801ff sub 168c:0002
[    8.188337] ath10k_pci 0000:01:00.0: kconfig debug 1 debugfs 1 tracing 0 dfs 0 testmode 0
[    8.199846] ath10k_pci 0000:01:00.0: firmware ver 10.4.3.00063 api 5 features no-p2p,peer-flow-ctrl crc32 a0d385ce
spams log over & over
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0001:01:00.0: dropping fw peer stats
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0000:01:00.0: dropping fw peer stats
ath10k_pci 0001:01:00.0: dropping fw peer stats