linux-kernel - Re: [PATCH] brcmfmac: fix setting AP channel with new firmwares

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Message-ID: <57461435.9080708@broadcom.com>
Date:	Wed, 25 May 2016 23:08:05 +0200
From:	Arend van Spriel <arend.vanspriel@...adcom.com>
To:	Rafał Miłecki <zajec5@...il.com>,
	Kalle Valo <kvalo@...eaurora.org>
Cc:	Brett Rudley <brudley@...adcom.com>,
	Arend van Spriel <arend@...adcom.com>,
	"Franky (Zhenhui) Lin" <frankyl@...adcom.com>,
	Hante Meuleman <meuleman@...adcom.com>,
	Pieter-Paul Giesberts <pieterpg@...adcom.com>,
	"open list:BROADCOM BRCM80211 IEEE802.11n WIRELESS DRIVER" 
	<linux-wireless@...r.kernel.org>,
	"open list:BROADCOM BRCM80211 IEEE802.11n WIRELESS DRIVER" 
	<brcm80211-dev-list@...adcom.com>,
	"open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] brcmfmac: fix setting AP channel with new firmwares



On 24-05-16 11:09, Rafał Miłecki wrote:
> Firmware for new chipsets is based on a new major version of code
> internally maintained at Broadcom. E.g. brcmfmac4366b-pcie.bin (used for
> BCM4366B1) is based on 10.10.69.3309 while brcmfmac43602-pcie.ap.bin was
> based on 7.35.177.56.
> 
> Currently setting AP 5 GHz channel doesn't work reliably with BCM4366B1.
> When setting e.g. 36 control channel with VHT80 (center channel 42)
> firmware may randomly pick one of:
> 1) 52 control channel with 58 as center one
> 2) 100 control channel with 106 as center one
> 3) 116 control channel with 122 as center one
> 4) 149 control channel with 155 as center one
> 
> It seems new firmwares require setting AP mode (BRCMF_C_SET_AP) before
> specifying a channel. Changing an order of firmware calls fixes the
> problem.
> 
> This fix was verified with BCM4366B1 and tested for regressions on
> BCM43602. It's unclear if it's needed (or correct at all) for P2P
> interfaces so it leaves this code unaffected.

In doing so the code reads a bit awkward so if P2P-GO works with the
changed order that would be preferable.

> Signed-off-by: Rafał Miłecki <zajec5@...il.com>
> ---
>  .../net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c  | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)