netdev - [PATCH v2 11/13] net: phy: add qca8081 soft_reset and enable master/slave seed

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Message-Id: <20211015073505.1893-12-luoj@codeaurora.org>
Date:   Fri, 15 Oct 2021 15:35:03 +0800
From:   Luo Jie <luoj@...eaurora.org>
To:     andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
        davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        sricharan@...eaurora.org, Luo Jie <luoj@...eaurora.org>
Subject: [PATCH v2 11/13] net: phy: add qca8081 soft_reset and enable master/slave seed

qca8081 phy is a single port phy, configure
phy the lower seed value to make it linked as slave
mode easier.

Signed-off-by: Luo Jie <luoj@...eaurora.org>
---
 drivers/net/phy/at803x.c | 47 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
index d838a21017f6..4d283c0c828c 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -214,6 +214,12 @@
 #define QCA808X_PHY_MMD3_DEBUG_6		0xa011
 #define QCA808X_MMD3_DEBUG_6_VALUE		0x5f85
 
+/* master/slave seed config */
+#define QCA808X_PHY_DEBUG_LOCAL_SEED		9
+#define QCA808X_MASTER_SLAVE_SEED_ENABLE	BIT(1)
+#define QCA808X_MASTER_SLAVE_SEED_CFG		GENMASK(12, 2)
+#define QCA808X_MASTER_SLAVE_SEED_RANGE		0x32
+
 MODULE_DESCRIPTION("Qualcomm Atheros AR803x and QCA808X PHY driver");
 MODULE_AUTHOR("Matus Ujhelyi");
 MODULE_LICENSE("GPL");
@@ -1471,6 +1477,25 @@ static int qca808x_phy_fast_retrain_config(struct phy_device *phydev)
 	return 0;
 }
 
+static int qca808x_phy_ms_random_seed_set(struct phy_device *phydev)
+{
+	u16 seed_value = (prandom_u32() % QCA808X_MASTER_SLAVE_SEED_RANGE) << 2;
+
+	return at803x_debug_reg_mask(phydev, QCA808X_PHY_DEBUG_LOCAL_SEED,
+			QCA808X_MASTER_SLAVE_SEED_CFG, seed_value);
+}
+
+static int qca808x_phy_ms_seed_enable(struct phy_device *phydev, bool enable)
+{
+	u16 seed_enable = 0;
+
+	if (enable)
+		seed_enable = QCA808X_MASTER_SLAVE_SEED_ENABLE;
+
+	return at803x_debug_reg_mask(phydev, QCA808X_PHY_DEBUG_LOCAL_SEED,
+			QCA808X_MASTER_SLAVE_SEED_ENABLE, seed_enable);
+}
+
 static int qca808x_config_init(struct phy_device *phydev)
 {
 	int ret;
@@ -1492,6 +1517,16 @@ static int qca808x_config_init(struct phy_device *phydev)
 	if (ret)
 		return ret;
 
+	/* Configure lower ramdom seed to make phy linked as slave mode */
+	ret = qca808x_phy_ms_random_seed_set(phydev);
+	if (ret)
+		return ret;
+
+	/* Enable seed */
+	ret = qca808x_phy_ms_seed_enable(phydev, true);
+	if (ret)
+		return ret;
+
 	/* Configure adc threshold as 100mv for the link 10M */
 	return at803x_debug_reg_mask(phydev, QCA808X_PHY_DEBUG_ADC_THRESHOLD,
 			QCA808X_ADC_THRESHOLD_MASK, QCA808X_ADC_THRESHOLD_100MV);
@@ -1524,6 +1559,17 @@ static int qca808x_read_status(struct phy_device *phydev)
 	return 0;
 }
 
+static int qca808x_soft_reset(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = genphy_soft_reset(phydev);
+	if (ret < 0)
+		return ret;
+
+	return qca808x_phy_ms_seed_enable(phydev, true);
+}
+
 static struct phy_driver at803x_driver[] = {
 {
 	/* Qualcomm Atheros AR8035 */
@@ -1649,6 +1695,7 @@ static struct phy_driver at803x_driver[] = {
 	.resume			= genphy_resume,
 	.read_status		= qca808x_read_status,
 	.config_init		= qca808x_config_init,
+	.soft_reset		= qca808x_soft_reset,
 }, };
 
 module_phy_driver(at803x_driver);
-- 
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a Linux Foundation Collaborative Project