netdev - Re: [PATCH] ath10k: Fix HOST capability QMI incompatibility

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Date:   Fri, 16 Aug 2019 16:11:41 -0500
From:   Rob Herring <robh@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Mark Rutland <mark.rutland@....com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        ath10k@...ts.infradead.org, stable@...r.kernel.org
Subject: Re: [PATCH] ath10k: Fix HOST capability QMI incompatibility

On Wed, Jul 24, 2019 at 11:31:08PM -0700, Bjorn Andersson wrote:
> The introduction of 768ec4c012ac ("ath10k: update HOST capability QMI
> message") served the purpose of supporting the new and extended HOST
> capability QMI message.
> 
> But while the new message adds a slew of optional members it changes the
> data type of the "daemon_support" member, which means that older
> versions of the firmware will fail to decode the incoming request
> message.
> 
> There is no way to detect this breakage from Linux and there's no way to
> recover from sending the wrong message (i.e. we can't just try one
> format and then fallback to the other), so a quirk is introduced in
> DeviceTree to indicate to the driver that the firmware requires the 8bit
> version of this message.
> 
> Cc: stable@...r.kernel.org
> Fixes: 768ec4c012ac ("ath10k: update HOST capability qmi message")
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>  .../bindings/net/wireless/qcom,ath10k.txt     |  6 +++++

Acked-by: Rob Herring <robh@...nel.org>

>  drivers/net/wireless/ath/ath10k/qmi.c         | 13 ++++++++---
>  .../net/wireless/ath/ath10k/qmi_wlfw_v01.c    | 22 +++++++++++++++++++
>  .../net/wireless/ath/ath10k/qmi_wlfw_v01.h    |  1 +
>  drivers/net/wireless/ath/ath10k/snoc.c        | 11 ++++++++++
>  drivers/net/wireless/ath/ath10k/snoc.h        |  1 +
>  6 files changed, 51 insertions(+), 3 deletions(-)