From:   Andrew Halaney <ahalaney@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     agross@kernel.org, andersson@kernel.org, konrad.dybcio@linaro.org,
        davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
        pabeni@redhat.com, robh+dt@kernel.org,
        krzysztof.kozlowski+dt@linaro.org, vkoul@kernel.org,
        bhupesh.sharma@linaro.org, mturquette@baylibre.com,
        sboyd@kernel.org, peppe.cavallaro@st.com,
        alexandre.torgue@foss.st.com, joabreu@synopsys.com,
        mcoquelin.stm32@gmail.com, richardcochran@gmail.com,
        linux@armlinux.org.uk, veekhee@apple.com,
        tee.min.tan@linux.intel.com, mohammad.athari.ismail@intel.com,
        jonathanh@nvidia.com, ruppala@nvidia.com, bmasney@redhat.com,
        andrey.konovalov@linaro.org, linux-arm-msm@vger.kernel.org,
        netdev@vger.kernel.org, devicetree@vger.kernel.org,
        linux-clk@vger.kernel.org,
        linux-stm32@st-md-mailman.stormreply.com,
        linux-arm-kernel@lists.infradead.org, ncai@quicinc.com,
        jsuraj@qti.qualcomm.com, hisunil@quicinc.com,
        Andrew Halaney <ahalaney@redhat.com>
Subject: [PATCH net-next 10/11] net: ethernet: stmmac: dwmac-qcom-ethqos: Use loopback_en for all speeds
Date:   Mon, 13 Mar 2023 11:56:19 -0500
Message-Id: <20230313165620.128463-11-ahalaney@redhat.com>
In-Reply-To: <20230313165620.128463-1-ahalaney@redhat.com>
References: <20230313165620.128463-1-ahalaney@redhat.com>
MIME-Version: 1.0
Content-type: text/plain
Content-Transfer-Encoding: 8bit
Precedence: bulk

It seems that this variable should be used for all speeds, not just
1000/100.

While at it refactor it slightly to be more readable, including fixing
the typo in the variable name.

Signed-off-by: Andrew Halaney <ahalaney@redhat.com>
---
 .../stmicro/stmmac/dwmac-qcom-ethqos.c        | 36 +++++++++----------
 1 file changed, 17 insertions(+), 19 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index 6f272cae330d..778852934e36 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -78,7 +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;
+	bool rgmii_config_loopback_en;
 };
 
 struct qcom_ethqos {
@@ -91,7 +91,7 @@ struct qcom_ethqos {
 
 	const struct ethqos_emac_por *por;
 	unsigned int num_por;
-	bool rgmii_config_looback_en;
+	bool rgmii_config_loopback_en;
 };
 
 static int rgmii_readl(struct qcom_ethqos *ethqos, unsigned int offset)
@@ -183,7 +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,
+	.rgmii_config_loopback_en = true,
 };
 
 static const struct ethqos_emac_por emac_v2_1_0_por[] = {
@@ -198,7 +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,
+	.rgmii_config_loopback_en = false,
 };
 
 static int ethqos_dll_configure(struct qcom_ethqos *ethqos)
@@ -281,6 +281,7 @@ static int ethqos_rgmii_macro_init(struct qcom_ethqos *ethqos)
 {
 	int phy_mode;
 	int phase_shift;
+	int loopback;
 
 	/* Determine if the PHY adds a 2 ns TX delay or the MAC handles it */
 	phy_mode = device_get_phy_mode(&ethqos->pdev->dev);
@@ -293,6 +294,12 @@ static int ethqos_rgmii_macro_init(struct qcom_ethqos *ethqos)
 	rgmii_updatel(ethqos, RGMII_CONFIG2_TX_TO_RX_LOOPBACK_EN,
 		      0, RGMII_IO_MACRO_CONFIG2);
 
+	/* Determine if this platform wants loopback enabled after programming */
+	if (ethqos->rgmii_config_loopback_en)
+		loopback = RGMII_CONFIG_LOOPBACK_EN;
+	else
+		loopback = 0;
+
 	/* Select RGMII, write 0 to interface select */
 	rgmii_updatel(ethqos, RGMII_CONFIG_INTF_SEL,
 		      0, RGMII_IO_MACRO_CONFIG);
@@ -325,12 +332,8 @@ 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);
-		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);
+		rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
+			      loopback, RGMII_IO_MACRO_CONFIG);
 		break;
 
 	case SPEED_100:
@@ -362,13 +365,8 @@ 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);
-		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);
-
+		rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
+			      loopback, RGMII_IO_MACRO_CONFIG);
 		break;
 
 	case SPEED_10:
@@ -402,7 +400,7 @@ static int ethqos_rgmii_macro_init(struct qcom_ethqos *ethqos)
 			      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);
+			      loopback, RGMII_IO_MACRO_CONFIG);
 		break;
 	default:
 		dev_err(&ethqos->pdev->dev,
@@ -547,7 +545,7 @@ 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_config_loopback_en = data->rgmii_config_loopback_en;
 
 	ethqos->rgmii_clk = devm_clk_get(&pdev->dev, "rgmii");
 	if (IS_ERR(ethqos->rgmii_clk)) {
-- 
2.39.2