linux-kernel - [PATCH v2 1/3] net: mdio: mdio-thunder: stop toggling SMI clock on idle

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Date:   Mon, 30 May 2022 05:53:26 -0700
From:   Piyush Malgujar <pmalgujar@...vell.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <krzysztof.kozlowski+dt@...aro.org>, <devicetree@...r.kernel.org>,
        <cchavva@...vell.com>, <deppel@...vell.com>,
        Piyush Malgujar <pmalgujar@...vell.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        "Jakub Kicinski" <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH v2 1/3] net: mdio: mdio-thunder: stop toggling SMI clock on idle

SMI clock should be running only for the time when there are transactions
on the bus.

Signed-off-by: Damian Eppel <deppel@...vell.com>
Signed-off-by: Piyush Malgujar <pmalgujar@...vell.com>
---
 drivers/net/mdio/mdio-thunder.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/mdio/mdio-thunder.c b/drivers/net/mdio/mdio-thunder.c
index 822d2cdd2f3599025f3e79d4243337c18114c951..715c835ace785da345ac037177b0f291678e4c47 100644
--- a/drivers/net/mdio/mdio-thunder.c
+++ b/drivers/net/mdio/mdio-thunder.c
@@ -58,6 +58,7 @@ static int thunder_mdiobus_pci_probe(struct pci_dev *pdev,
 		struct resource r;
 		struct mii_bus *mii_bus;
 		struct cavium_mdiobus *bus;
+		union cvmx_smix_clk smi_clk;
 		union cvmx_smix_en smi_en;
 
 		/* If it is not an OF node we cannot handle it yet, so
@@ -87,6 +88,10 @@ static int thunder_mdiobus_pci_probe(struct pci_dev *pdev,
 		bus->register_base = nexus->bar0 +
 			r.start - pci_resource_start(pdev, 0);
 
+		smi_clk.u64 = oct_mdio_readq(bus->register_base + SMI_CLK);
+		smi_clk.s.clk_idle = 1;
+		oct_mdio_writeq(smi_clk.u64, bus->register_base + SMI_CLK);
+
 		smi_en.u64 = 0;
 		smi_en.s.en = 1;
 		oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
-- 
2.17.1