linux-kernel - Re: [PATCH 4/4] memory: brcmstb_dpfe: introduce best-effort API detection

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Message-ID: <ea67da10-0e8d-47d1-992c-484977d152b6@gmail.com>
Date:   Tue, 5 Dec 2023 11:06:07 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Markus Mayer <mmayer@...adcom.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Rob Herring <robh+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
        Device Tree Mailing List <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] memory: brcmstb_dpfe: introduce best-effort API
 detection

On 12/5/23 10:47, Markus Mayer wrote:
> Add a best-effort probe function that tries all known DPFE versions to
> see if one might actually work. This helps in cases where device tree
> doesn't provide the proper version information for whatever reason. In
> that case, the driver may still be able to register if one of the known
> API versions ends up working.
> 
> Caveat: we have to skip "v1" during our best effort attempts. This is
> due to the fact that attempting a firmware download as required by v1
> will result in a memory access violation on anything but v1 hardware.
> This would crash the kernel. Since we don't know the HW version, we need
> to play it safe and skip v1.
> 
> Signed-off-by: Markus Mayer <mmayer@...adcom.com>

Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
-- 
Florian