brcmfmac firmware issue on NanoPi K2

[afaerber@suse.de (Andreas Färber)]

Hello,

The NanoPi K2 has an Ampak AP6212 SDIO module. brcmfmac driver loads
brcmfmac43430-sdio.bin.

When using the firmware file from linux-firmware.git that openSUSE ships
I get the following errors on 4.11.0 and next-20170519:

[ 2103.618716] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000):
clkctl 0x50
[ 2104.668746] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000):
clkctl 0x50
[ 2105.678677] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000):
clkctl 0x50

If I overwrite /lib/firmware/brcm/bcm43430-sdio.bin with
fw_bcm43438a0.bin from FriendlyARM's Android repository it suddenly works:

[  +0.157738] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0:
Jun  6 2014 14:50:39 version 7.10.226.49 (r) FWID 01-8962686a
[  +0.160108] brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code
(0x30 0x30)

I recall using the linux-firmware.git brcmfmac43430-sdio.bin file
successfully on the Raspberry Pi 3 with a downstream (Leap 42.2) kernel.

I've tested both nvram_ap6212.txt and nvram_ap6212a.txt, the latter has
the following diff to nvram.txt:

--- nvram_ap6212.txt    2017-05-21 04:24:40.372113426 +0200
+++ nvram_ap6212a.txt   2017-05-21 04:24:49.852116599 +0200
@@ -1,4 +1,4 @@
-#AP6212_NVRAM_V1.0_20140603
+#AP6212_NVRAM_V1.0.1_20160606
 # 2.4 GHz, 20 MHz BW mode

 # The following parameter values are just placeholders, need to be updated.
@@ -51,4 +51,4 @@
 muxenab=0x10
 # CLDO PWM voltage settings - 0x4 - 1.1 volt
 #cldo_pwm=0x4
-
+glitch_based_crsmin=1

https://github.com/friendlyarm/android_hardware_amlogic_wifi/tree/l-amlogic-gx-sync/bcm_ampak/config/6212

* Does the linux-firmware.git brcmfmac43430-sdio.bin need a fix for AP6212?
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/brcm

* Does the brcmfmac driver need to distinguish revisions in sdio.c as
done for 43241, plus a separate firmware file?
	BRCMF_FW_NVRAM_ENTRY(BRCM_CC_43430_CHIP_ID, 0xFFFFFFFF, 43430),

* Any other ideas?

Thanks,
Andreas

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