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

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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@xxxxxxxxxxx>
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;

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