linux-kernel - Re: [PATCH net-next v4 2/9] net: stmmac: xgmac: add more feature parsing from hw cap

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Message-ID: <9e55fd03-6b05-46de-874e-01d9cdbf4524@lunn.ch>
Date:   Sun, 20 Aug 2023 21:15:06 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jisheng Zhang <jszhang@...nel.org>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next v4 2/9] net: stmmac: xgmac: add more feature
 parsing from hw cap

On Wed, Aug 16, 2023 at 11:29:19PM +0800, Jisheng Zhang wrote:
> The XGMAC_HWFEAT_GMIISEL bit also indicates whether support 10/100Mbps
> or not.

The commit message fails to explain the 'Why?' question. GMII does
normally imply 10/100/1000, so i would expect dma_cap->mbps_1000 also
implies 10/100/1000? So why also set dma_cap->mbps_10_100?

Maybe a better change would be to modify:

        seq_printf(seq, "\t1000 Mbps: %s\n",
                   (priv->dma_cap.mbps_1000) ? "Y" : "N");

to actually say 10/100/1000 Mbps? It does not appear this is used for
anything other than debugfs?

	Andrew