diff mbox series

[v2,2/2,net-next] net: stmmac: dwmac-qcom-ethqos: Adjust rgmii loopback_en per platform

Message ID 20220302103950.30356-3-bhupesh.sharma@linaro.org (mailing list archive)
State Accepted
Commit a7bf6d7c9249946996bc622a7a8584f2c48ea372
Delegated to: Netdev Maintainers
Headers show
Series net: stmmac: Enable support for Qualcomm SA8155p-ADP board | expand

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netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers warning 7 maintainers not CCed: mcoquelin.stm32@gmail.com linux-stm32@st-md-mailman.stormreply.com kuba@kernel.org joabreu@synopsys.com peppe.cavallaro@st.com alexandre.torgue@foss.st.com linux-arm-kernel@lists.infradead.org
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
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Commit Message

Bhupesh Sharma March 2, 2022, 10:39 a.m. UTC 
From: Bjorn Andersson <bjorn.andersson@linaro.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@davemloft.net>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 .../stmicro/stmmac/dwmac-qcom-ethqos.c        | 22 +++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)
diff mbox series

Patch

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)) {