Subject: [PATCH v2 net-next 02/10] net: phy: bcm7xx: Add jumbo frame configuration to PHY

From: Vladimir Oltean <[email-masked]>
Date: Wed, 25 Mar 2020 17:22:01 +0200

From: Murali Krishna Policharla <[email-masked]>

Add API to configure jumbo frame settings in PHY during initial PHY
configuration.

Signed-off-by: Murali Krishna Policharla <[email-masked]>
Reviewed-by: Scott Branden <[email-masked]>
Signed-off-by: Vladimir Oltean <[email-masked]>
---
 drivers/net/phy/bcm-phy-lib.c | 28 ++++++++++++++++++++++++++++
 drivers/net/phy/bcm-phy-lib.h |  1 +
 drivers/net/phy/bcm7xxx.c     |  4 ++++
 include/linux/brcmphy.h       |  1 +
 4 files changed, 34 insertions(+)

diff --git a/drivers/net/phy/bcm-phy-lib.c b/drivers/net/phy/bcm-phy-lib.c
index e0d3310957ff..a26c80e13b43 100644
--- a/drivers/net/phy/bcm-phy-lib.c
+++ b/drivers/net/phy/bcm-phy-lib.c
@@ -423,6 +423,34 @@ int bcm_phy_28nm_a0b0_afe_config_init(struct phy_device *phydev)
 }
 EXPORT_SYMBOL_GPL(bcm_phy_28nm_a0b0_afe_config_init);
 
+int bcm_phy_enable_jumbo(struct phy_device *phydev)
+{
+	int val = 0, ret = 0;
+
+	ret = phy_write(phydev, MII_BCM54XX_AUX_CTL,
+			MII_BCM54XX_AUXCTL_SHDWSEL_MISC);
+	if (ret < 0)
+		return ret;
+
+	val = phy_read(phydev, MII_BCM54XX_AUX_CTL);
+
+	/* Enable extended length packet reception */
+	val |= MII_BCM54XX_AUXCTL_ACTL_EXT_PKT_LEN;
+	ret = phy_write(phydev, MII_BCM54XX_AUX_CTL, val);
+
+	if (ret < 0)
+		return ret;
+
+	val = phy_read(phydev, MII_BCM54XX_ECR);
+
+	/* Enable 10K byte packet length reception */
+	val |= BIT(0);
+	ret =  phy_write(phydev, MII_BCM54XX_ECR, val);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(bcm_phy_enable_jumbo);
+
 MODULE_DESCRIPTION("Broadcom PHY Library");
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Broadcom Corporation");
diff --git a/drivers/net/phy/bcm-phy-lib.h b/drivers/net/phy/bcm-phy-lib.h
index c86fb9d1240c..129df819be8c 100644
--- a/drivers/net/phy/bcm-phy-lib.h
+++ b/drivers/net/phy/bcm-phy-lib.h
@@ -65,5 +65,6 @@ void bcm_phy_get_stats(struct phy_device *phydev, u64 *shadow,
 		       struct ethtool_stats *stats, u64 *data);
 void bcm_phy_r_rc_cal_reset(struct phy_device *phydev);
 int bcm_phy_28nm_a0b0_afe_config_init(struct phy_device *phydev);
+int bcm_phy_enable_jumbo(struct phy_device *phydev);
 
 #endif /* _LINUX_BCM_PHY_LIB_H */
diff --git a/drivers/net/phy/bcm7xxx.c b/drivers/net/phy/bcm7xxx.c
index af8eabe7a6d4..692048d86ab1 100644
--- a/drivers/net/phy/bcm7xxx.c
+++ b/drivers/net/phy/bcm7xxx.c
@@ -178,6 +178,10 @@ static int bcm7xxx_28nm_config_init(struct phy_device *phydev)
 		break;
 	}
 
+	if (ret)
+		return ret;
+
+	ret =  bcm_phy_enable_jumbo(phydev);
 	if (ret)
 		return ret;
 
diff --git a/include/linux/brcmphy.h b/include/linux/brcmphy.h
index b475e7f20d28..19bd86019e93 100644
--- a/include/linux/brcmphy.h
+++ b/include/linux/brcmphy.h
@@ -119,6 +119,7 @@
 #define MII_BCM54XX_AUXCTL_SHDWSEL_AUXCTL	0x00
 #define MII_BCM54XX_AUXCTL_ACTL_TX_6DB		0x0400
 #define MII_BCM54XX_AUXCTL_ACTL_SMDSP_ENA	0x0800
+#define MII_BCM54XX_AUXCTL_ACTL_EXT_PKT_LEN	0x4000
 
 #define MII_BCM54XX_AUXCTL_SHDWSEL_MISC			0x07
 #define MII_BCM54XX_AUXCTL_SHDWSEL_MISC_WIRESPEED_EN	0x0010
-- 
2.17.1