netdev - Re: [PATCH net-next 2/3] net: stmmac: xgmac: Correct supported speed modes

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Message-ID: <aHib9V1_WZfj3S8M@shell.armlinux.org.uk>
Date: Thu, 17 Jul 2025 07:45:09 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: rohan.g.thomas@...era.com
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Serge Semin <fancer.lancer@...il.com>,
	Romain Gantois <romain.gantois@...tlin.com>, netdev@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Matthew Gerlach <matthew.gerlach@...era.com>
Subject: Re: [PATCH net-next 2/3] net: stmmac: xgmac: Correct supported speed
 modes

On Mon, Jul 14, 2025 at 03:59:18PM +0800, Rohan G Thomas via B4 Relay wrote:
> @@ -1532,8 +1542,8 @@ int dwxgmac2_setup(struct stmmac_priv *priv)
>  		mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
>  
>  	mac->link.caps = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
> -			 MAC_1000FD | MAC_2500FD | MAC_5000FD |
> -			 MAC_10000FD;
> +			 MAC_10FD | MAC_100FD | MAC_1000FD |
> +			 MAC_2500FD | MAC_5000FD | MAC_10000FD;
...
> @@ -405,6 +405,7 @@ static int dwxgmac2_get_hw_feature(void __iomem *ioaddr,
>  	dma_cap->sma_mdio = (hw_cap & XGMAC_HWFEAT_SMASEL) >> 5;
>  	dma_cap->vlhash = (hw_cap & XGMAC_HWFEAT_VLHASH) >> 4;
>  	dma_cap->half_duplex = (hw_cap & XGMAC_HWFEAT_HDSEL) >> 3;
> +	dma_cap->mbps_10_100 = (hw_cap & XGMAC_HWFEAT_GMIISEL) >> 1;

What if dma_cap->mbps_10_100 is false? Should MAC_10FD | MAC_100FD
still be set? What if dma_cap->half_duplex is set but
dma_cap->mbps_10_100 is not? Should we avoid setting 10HD and 100HD?

-- 
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