linux-kernel - [PATCH v2 2/2 net-next] net: stmmac: dwmac-qcom-ethqos: Adjust rgmii loopback

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Date:   Wed,  2 Mar 2022 16:09:50 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     netdev@...r.kernel.org
Cc:     bhupesh.sharma@...aro.org, bhupesh.linux@...il.com,
        vkoul@...nel.org, linux-kernel@...r.kernel.org,
        davem@...emloft.net, linux-arm-msm@...r.kernel.org,
        bjorn.andersson@...aro.org
Subject: [PATCH v2 2/2 net-next] net: stmmac: dwmac-qcom-ethqos: Adjust rgmii loopback_en per platform

From: Bjorn Andersson <bjorn.andersson@...aro.org>

Not all platforms should have RGMII_CONFIG_LOOPBACK_EN and the result it
about 50% packet loss on incoming messages. So make it possile to
configure this per compatible and enable it for QCS404.

Cc: David S. Miller <davem@...emloft.net>
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---
 .../stmicro/stmmac/dwmac-qcom-ethqos.c        | 22 +++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index 8cdba9d521ec..0cc28c79cc61 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -78,6 +78,7 @@ struct ethqos_emac_por {
 struct ethqos_emac_driver_data {
 	const struct ethqos_emac_por *por;
 	unsigned int num_por;
+	bool rgmii_config_looback_en;
 };
 
 struct qcom_ethqos {
@@ -90,6 +91,7 @@ struct qcom_ethqos {
 
 	const struct ethqos_emac_por *por;
 	unsigned int num_por;
+	bool rgmii_config_looback_en;
 };
 
 static int rgmii_readl(struct qcom_ethqos *ethqos, unsigned int offset)
@@ -181,6 +183,7 @@ static const struct ethqos_emac_por emac_v2_3_0_por[] = {
 static const struct ethqos_emac_driver_data emac_v2_3_0_data = {
 	.por = emac_v2_3_0_por,
 	.num_por = ARRAY_SIZE(emac_v2_3_0_por),
+	.rgmii_config_looback_en = true,
 };
 
 static const struct ethqos_emac_por emac_v2_1_0_por[] = {
@@ -195,6 +198,7 @@ static const struct ethqos_emac_por emac_v2_1_0_por[] = {
 static const struct ethqos_emac_driver_data emac_v2_1_0_data = {
 	.por = emac_v2_1_0_por,
 	.num_por = ARRAY_SIZE(emac_v2_1_0_por),
+	.rgmii_config_looback_en = false,
 };
 
 static int ethqos_dll_configure(struct qcom_ethqos *ethqos)
@@ -311,8 +315,12 @@ static int ethqos_rgmii_macro_init(struct qcom_ethqos *ethqos)
 		rgmii_updatel(ethqos, SDCC_DDR_CONFIG_PRG_DLY_EN,
 			      SDCC_DDR_CONFIG_PRG_DLY_EN,
 			      SDCC_HC_REG_DDR_CONFIG);
-		rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
-			      RGMII_CONFIG_LOOPBACK_EN, RGMII_IO_MACRO_CONFIG);
+		if (ethqos->rgmii_config_looback_en)
+			rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
+				      RGMII_CONFIG_LOOPBACK_EN, RGMII_IO_MACRO_CONFIG);
+		else
+			rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
+				      0, RGMII_IO_MACRO_CONFIG);
 		break;
 
 	case SPEED_100:
@@ -345,8 +353,13 @@ static int ethqos_rgmii_macro_init(struct qcom_ethqos *ethqos)
 		rgmii_updatel(ethqos, SDCC_DDR_CONFIG_EXT_PRG_RCLK_DLY_EN,
 			      SDCC_DDR_CONFIG_EXT_PRG_RCLK_DLY_EN,
 			      SDCC_HC_REG_DDR_CONFIG);
-		rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
-			      RGMII_CONFIG_LOOPBACK_EN, RGMII_IO_MACRO_CONFIG);
+		if (ethqos->rgmii_config_looback_en)
+			rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
+				      RGMII_CONFIG_LOOPBACK_EN, RGMII_IO_MACRO_CONFIG);
+		else
+			rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
+				      0, RGMII_IO_MACRO_CONFIG);
+
 		break;
 
 	case SPEED_10:
@@ -518,6 +531,7 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
 	data = of_device_get_match_data(&pdev->dev);
 	ethqos->por = data->por;
 	ethqos->num_por = data->num_por;
+	ethqos->rgmii_config_looback_en = data->rgmii_config_looback_en;
 
 	ethqos->rgmii_clk = devm_clk_get(&pdev->dev, "rgmii");
 	if (IS_ERR(ethqos->rgmii_clk)) {
-- 
2.35.1