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

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Date: Mon, 26 Feb 2024 15:12:26 +0530
From: Sarosh Hasan <quic_sarohasa@...cinc.com>
To: 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: [PATCH net-next v2] net: stmmac: dwmac-qcom-ethqos: Update link clock rate only for RGMII

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>
---
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;
-- 
2.17.1