linux-kernel - Re: [PATCH] ath11k: Fix QCN9074 firmware boot on x86

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Date:   Tue, 01 Nov 2022 16:46:22 +0200
From:   Kalle Valo <kvalo@...nel.org>
To:     "Tyler J. Stachecki" <stachecki.tyler@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        ath11k@...ts.infradead.org (open list:QUALCOMM ATHEROS ATH11K WIRELESS
        DRIVER),
        linux-wireless@...r.kernel.org (open list:NETWORKING DRIVERS (WIRELESS)),
        netdev@...r.kernel.org (open list:NETWORKING DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Subject: Re: [PATCH] ath11k: Fix QCN9074 firmware boot on x86

"Tyler J. Stachecki" <stachecki.tyler@...il.com> writes:

> The 2.7.0 series of QCN9074's firmware requests 5 segments
> of memory instead of 3 (as in the 2.5.0 series).
>
> The first segment (11M) is too large to be kalloc'd in one
> go on x86 and requires piecemeal 1MB allocations, as was
> the case with the prior public firmware (2.5.0, 15M).
>
> Since f6f92968e1e5, ath11k will break the memory requests,
> but only if there were fewer than 3 segments requested by
> the firmware. It seems that 5 segments works fine and
> allows QCN9074 to boot on x86 with firmware 2.7.0, so
> change things accordingly.
>
> Signed-off-by: Tyler J. Stachecki <stachecki.tyler@...il.com>

Ouch, that's pretty bad. Thanks for fixing this!

Does the 2.5.0.1 firmware branch still work with this patch? It's
important that we don't break the old firmware.

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