linux-kernel - Re: [PATCH v2] net: stmmac: dwmac-qcom-ethqos: Add support for 2.5G SGMII

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Message-ID: <4216bcbb-730d-4c51-a9ce-d3f0a0846e31@lunn.ch>
Date: Mon, 8 Jan 2024 20:30:36 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Sneh Shah <quic_snehshah@...cinc.com>
Cc: Vinod Koul <vkoul@...nel.org>,
	Bhupesh Sharma <bhupesh.sharma@...aro.org>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	"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>, netdev@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel@...cinc.com, Andrew Halaney <ahalaney@...hat.com>
Subject: Re: [PATCH v2] net: stmmac: dwmac-qcom-ethqos: Add support for 2.5G
 SGMII

On Mon, Jan 08, 2024 at 05:41:28PM +0530, Sneh Shah wrote:
> Serdes phy needs to operate at 2500 mode for 2.5G speed and 1000
> mode for 1G/100M/10M speed.
> Added changes to configure serdes phy and mac based on link speed.

Please take a look at:

https://www.kernel.org/doc/html/next/process/maintainer-netdev.html

The Subject is missing which tree this is for. Also, net-next is
closed at the moment.

>  	switch (ethqos->speed) {
> +	case SPEED_2500:
> +		val &= ~ETHQOS_MAC_CTRL_PORT_SEL;
> +		rgmii_updatel(ethqos, RGMII_CONFIG2_RGMII_CLK_SEL_CFG,
> +			      RGMII_CONFIG2_RGMII_CLK_SEL_CFG,
> +			      RGMII_IO_MACRO_CONFIG2);
> +		if (ethqos->serdes_speed != SPEED_2500)
> +			phy_set_speed(ethqos->serdes_phy, SPEED_2500);

Is calling phy_set_speed() expensive? Why not just unconditionally
call it?

     Andrew