netdev - Re: [PATCH net 1/4] net/fsl: xgmac_mdio: Add workaround for erratum A-009885

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Message-ID: <877daxcu7j.fsf@waldekranz.com>
Date:   Tue, 18 Jan 2022 09:40:48 +0100
From:   Tobias Waldekranz <tobias@...dekranz.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     madalin.bucur@....com, robh+dt@...nel.org, mpe@...erman.id.au,
        benh@...nel.crashing.org, paulus@...ba.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH net 1/4] net/fsl: xgmac_mdio: Add workaround for erratum
 A-009885

On Sun, Jan 16, 2022 at 22:15, Tobias Waldekranz <tobias@...dekranz.com> wrote:
> Once an MDIO read transaction is initiated, we must read back the data
> register within 16 MDC cycles after the transaction completes. Outside
> of this window, reads may return corrupt data.
>
> Therefore, disable local interrupts in the critical section, to
> maximize the probability that we can satisfy this requirement.
>
> Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>

Fixes: d55ad2967d89 ("powerpc/mpc85xx: Create dts components for the FSL QorIQ DPAA FMan")