netdev - [PATCH 2/3] net: stmmac: Bring down the clocks to lower frequencies when mac link goes down

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Message-ID: <20240619-icc_bw_voting_from_ethqos-v1-2-6112948b825e@quicinc.com>
Date: Wed, 19 Jun 2024 15:41:30 -0700
From: Sagar Cheluvegowda <quic_scheluve@...cinc.com>
To: Vinod Koul <vkoul@...nel.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>,
        Russell King <linux@...linux.org.uk>, "Rob
 Herring" <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        "Conor
 Dooley" <conor+dt@...nel.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>
CC: <kernel@...cinc.com>, Andrew Halaney <ahalaney@...hat.com>,
        <linux-arm-msm@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        Sagar Cheluvegowda <quic_scheluve@...cinc.com>
Subject: [PATCH 2/3] net: stmmac: Bring down the clocks to lower
 frequencies when mac link goes down

When mac link goes down we don't need to mainitain the clocks to operate
at higher frequencies, as an optimized solution to save power when
the link goes down we are trying to bring down the clocks to the
frequencies corresponding to the lowest speed possible.

Signed-off-by: Sagar Cheluvegowda <quic_scheluve@...cinc.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index b3afc7cb7d72..bfb201a4b885 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -990,6 +990,9 @@ static void stmmac_mac_link_down(struct phylink_config *config,
 {
 	struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));
 
+	if (priv->plat->fix_mac_speed)
+		priv->plat->fix_mac_speed(priv->plat->bsp_priv, SPEED_10, mode);
+
 	stmmac_mac_set(priv, priv->ioaddr, false);
 	priv->eee_active = false;
 	priv->tx_lpi_enabled = false;

-- 
2.34.1