linux-kernel - [PATCH 1/3] net: stmmac: Add interconnect support in qcom-ethqos driver

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Message-ID: <20240619-icc_bw_voting_from_ethqos-v1-1-6112948b825e@quicinc.com>
Date: Wed, 19 Jun 2024 15:41:29 -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 1/3] net: stmmac: Add interconnect support in qcom-ethqos
 driver

Add interconnect support in qcom-ethqos driver to vote for bus
bandwidth based on the current speed of the driver.
This change adds support for two different paths - one from ethernet
to DDR and the other from Apps to ethernet.
Vote from each interconnect client is aggregated and the on-chip
interconnect hardware is configured to the most appropriate
bandwidth profile.

Signed-off-by: Sagar Cheluvegowda <quic_scheluve@...cinc.com>
---
 .../net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c   | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index e254b21fdb59..682e68f37dbd 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -7,6 +7,7 @@
 #include <linux/platform_device.h>
 #include <linux/phy.h>
 #include <linux/phy/phy.h>
+#include <linux/interconnect.h>
 
 #include "stmmac.h"
 #include "stmmac_platform.h"
@@ -113,6 +114,9 @@ struct qcom_ethqos {
 	unsigned int num_por;
 	bool rgmii_config_loopback_en;
 	bool has_emac_ge_3;
+
+	struct icc_path *axi_icc_path;
+	struct icc_path *ahb_icc_path;
 };
 
 static int rgmii_readl(struct qcom_ethqos *ethqos, unsigned int offset)
@@ -668,12 +672,19 @@ static int ethqos_configure(struct qcom_ethqos *ethqos)
 	return ethqos->configure_func(ethqos);
 }
 
+static void ethqos_set_icc_bw(struct qcom_ethqos *ethqos, unsigned int speed)
+{
+	icc_set_bw(ethqos->axi_icc_path, Mbps_to_icc(speed), Mbps_to_icc(speed));
+	icc_set_bw(ethqos->ahb_icc_path, Mbps_to_icc(speed), Mbps_to_icc(speed));
+}
+
 static void ethqos_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode)
 {
 	struct qcom_ethqos *ethqos = priv;
 
 	ethqos->speed = speed;
 	ethqos_update_link_clk(ethqos, speed);
+	ethqos_set_icc_bw(ethqos, speed);
 	ethqos_configure(ethqos);
 }
 
@@ -813,6 +824,14 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, PTR_ERR(ethqos->link_clk),
 				     "Failed to get link_clk\n");
 
+	ethqos->axi_icc_path = devm_of_icc_get(dev, "axi_icc_path");
+	if (IS_ERR(ethqos->axi_icc_path))
+		return PTR_ERR(ethqos->axi_icc_path);
+
+	ethqos->ahb_icc_path = devm_of_icc_get(dev, "ahb_icc_path");
+	if (IS_ERR(ethqos->axi_icc_path))
+		return PTR_ERR(ethqos->axi_icc_path);
+
 	ret = ethqos_clks_config(ethqos, true);
 	if (ret)
 		return ret;

-- 
2.34.1