linux-kernel - Re: [PATCH net-next v2] net: stmmac: dwmac-qcom-ethqos: Update link clock rate only for RGMII

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Message-ID: <17c06c23-49b3-4db9-a021-82904eae6a7d@quicinc.com>
Date: Tue, 27 Feb 2024 10:45:41 -0800
From: "Abhishek Chauhan (ABC)" <quic_abchauha@...cinc.com>
To: Sarosh Hasan <quic_sarohasa@...cinc.com>, Vinod Koul <vkoul@...nel.org>,
        Andy Gross <agross@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "David S. Miller"
	<davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu
	<joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>, <netdev@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Prasad Sodagudi
	<psodagud@...cinc.com>,
        Andrew Halaney <ahalaney@...hat.com>, Rob Herring
	<robh@...nel.org>
CC: <kernel@...cinc.com>, Sneh Shah <quic_snehshah@...cinc.com>,
        Suraj Jaiswal
	<quic_jsuraj@...cinc.com>
Subject: Re: [PATCH net-next v2] net: stmmac: dwmac-qcom-ethqos: Update link
 clock rate only for RGMII



On 2/26/2024 1:42 AM, Sarosh Hasan wrote:
> Updating link clock rate for different speeds is only needed when
> using RGMII, as that mode requires changing clock speed when the link
> speed changes. Let's restrict updating the link clock speed in
> ethqos_update_link_clk() to just RGMII. Other modes such as SGMII
> only need to enable the link clock (which is already done in probe).
> 
> Signed-off-by: Sarosh Hasan <quic_sarohasa@...cinc.com>
Reviewed-by: Abhishek Chauhan <quic_abchauha@...cinc.com>

> ---
> v2 changelog:
> - Addressed Konrad Dybcio comment on optimizing the patch
> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> index 31631e3f89d0..c182294a6515 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> @@ -169,6 +169,9 @@ static void rgmii_dump(void *priv)
>  static void
>  ethqos_update_link_clk(struct qcom_ethqos *ethqos, unsigned int speed)
>  {
> +	if (!phy_interface_mode_is_rgmii(ethqos->phy_mode))
> +		return;
> +
>  	switch (speed) {
>  	case SPEED_1000:
>  		ethqos->link_clk_rate =  RGMII_1000_NOM_CLK_FREQ;