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Subject: Re: Current mainline brcmfmac reports error on supposedly supported
 ap6256 chip
To:     Piotr Oniszczuk <piotr.oniszczuk@gmail.com>
Cc:     linux-wireless <linux-wireless@vger.kernel.org>,
        Ondrej Jirman <megous@megous.com>
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From:   Arend van Spriel <arend.vanspriel@broadcom.com>
Message-ID: <7365182a-ab99-899b-7ac9-c13b31e02f06@broadcom.com>
Date:   Mon, 26 Jul 2021 14:31:22 +0200
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On 7/26/2021 2:21 PM, Piotr Oniszczuk wrote:
> Arend,
> 
> Neil Armstrong hinted me issue might be related to usage of memcpy() to/from an iomem mapping.
> arm64 memcpy update (285133040e6c ("arm64: Import latest memcpy()/memmove() implementation")) triggers a memory abort when dram-access-quirk
> is used on the G12A/G12B platforms.
> 
> I reverted https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/mmc/host/meson-gx-mmc.c?h=v5.13.4&id=103a5348c22c3fca8b96c735a9e353b8a0801842
> 
> and got nicely working wifi.
> 
> So it looks root cause is amlogic specific - not brcmfmac.
> 
> Sorry for false report and many many thx for Your head-up!

Hi Piotr,

Thanks for letting me know. I hadn't worked yet on the patch I had in 
mind and I suspect it would not have helped.

Regards,
Arend