netdev - Re: [PATCH 08/14] net: ks8851: Use 16-bit read of RXFC register

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Message-ID: <20200324104102.axlr6txhbgxhhw7k@wunner.de>
Date:   Tue, 24 Mar 2020 11:41:02 +0100
From:   Lukas Wunner <lukas@...ner.de>
To:     Marek Vasut <marex@...x.de>
Cc:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Petr Stetiar <ynezz@...e.cz>,
        YueHaibing <yuehaibing@...wei.com>, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH 08/14] net: ks8851: Use 16-bit read of RXFC register

On Tue, Mar 24, 2020 at 12:42:57AM +0100, Marek Vasut wrote:
> The RXFC register is the only one being read using 8-bit accessors.
> To make it easier to support the 16-bit accesses used by the parallel
> bus variant of KS8851, use 16-bit accessor to read RXFC register as
> well as neighboring RXFCTR register.

This means that an additional 8 bits need to be transferred over the
SPI bus whenever a set of packets is read from the RX queue.  This
should be avoided.  I'd suggest adding a separate hook to read RXFC
and thus keep the 8-bit read function for the SPI variant.

Thanks,

Lukas