linux-kernel - Re: [net-next RFC PATCH 1/6] wifi: mt76: fix broken precal loading from MTD for mt7915

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Date:   Wed, 18 Oct 2023 09:10:07 +0300
From:   Kalle Valo <kvalo@...nel.org>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     Felix Fietkau <nbd@....name>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Shayne Chen <shayne.chen@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Simon Horman <horms@...nel.org>,
        Alexander Couzens <lynxis@...0.eu>,
        Nicolas Cavallari <nicolas.cavallari@...en-communications.fr>,
        Daniel Golle <daniel@...rotopia.org>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, stable@...r.kernel.org
Subject: Re: [net-next RFC PATCH 1/6] wifi: mt76: fix broken precal loading
 from MTD for mt7915

Christian Marangi <ansuelsmth@...il.com> writes:

> Commit 495184ac91bb ("mt76: mt7915: add support for applying
> pre-calibration data") was fundamentally broken and never worked.
>
> The idea (before NVMEM support) was to expand the MTD function and pass
> an additional offset. For normal EEPROM load the offset would always be
> 0. For the purpose of precal loading, an offset was passed that was
> internally the size of EEPROM, since precal data is right after the
> EEPROM.
>
> Problem is that the offset value passed is never handled and is actually
> overwrite by
>
> 	offset = be32_to_cpup(list);
> 	ret = mtd_read(mtd, offset, len, &retlen, eep);
>
> resulting in the passed offset value always ingnored. (and even passing
> garbage data as precal as the start of the EEPROM is getting read)
>
> Fix this by adding to the current offset value, the offset from DT to
> correctly read the piece of data at the requested location.
>
> Cc: stable@...r.kernel.org
> Fixes: 495184ac91bb ("mt76: mt7915: add support for applying pre-calibration data")
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>

mt76 patches go to Felix's tree, not net-next.

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