linux-kernel - Re: [PATCH net-next v4] net: stmmac: dwmac-qcom-ethqos: Add support for 2.5G SGMII

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Message-ID: <20240212173015.0341f0ee@kernel.org>
Date: Mon, 12 Feb 2024 17:30:15 -0800
From: Jakub Kicinski <kuba@...nel.org>
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>, 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 net-next v4] net: stmmac: dwmac-qcom-ethqos: Add support
 for 2.5G SGMII

On Thu,  8 Feb 2024 16:47:14 +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.
> Changing serdes phy speed involves multiple register writes for
> serdes block. To avoid redundant write operations only update serdes
> phy when new speed is different.

Sounds like 2 separate changes in one patch, please split the
optimization of not writing the registers multiple times and
the 2.5G support.

> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> index 31631e3f89d0..6bbdbb7bef44 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> @@ -106,6 +106,7 @@ struct qcom_ethqos {
>  	struct clk *link_clk;
>  	struct phy *serdes_phy;
>  	unsigned int speed;
> +	int serdes_speed;

Why signed if speed itself is unsigned?

>  	/* Enable and restart the Auto-Negotiation */
>  	if (ane)
>  		value |= GMAC_AN_CTRL_ANE | GMAC_AN_CTRL_RAN;
> +	else
> +		value &= ~GMAC_AN_CTRL_ANE;

That looks unrelated. Either a separate patch or please explain in the
commit msg why.
-- 
pw-bot: cr