[U-Boot] [PATCH v1 1/1] net: phy: Add AFE settings to the Broadcom Cygnus phy

[Arun Parameswaran]

Added the AFE (Analog Front End) settings for stability to the
Broadcom Cygnus phy. This improves the time take to perform
auto negotiation.

Signed-off-by: Arun Parameswaran <arun.parameswaran at broadcom.com>
---
 drivers/net/phy/broadcom.c | 64 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 63 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c
index 9871cc3..e4afa90 100644
--- a/drivers/net/phy/broadcom.c
+++ b/drivers/net/phy/broadcom.c
@@ -30,6 +30,29 @@
 #define MIIM_BCM54XX_EXP_SEL_SSD	0x0e00	/* Secondary SerDes select */
 #define MIIM_BCM54XX_EXP_SEL_ER		0x0f00	/* Expansion register select */
 
+#define MIIM_BCM_AUXCNTL_SHDWSEL_MISC	0x0007
+#define MIIM_BCM_AUXCNTL_ACTL_SMDSP_EN	0x0800
+
+#define MIIM_BCM_CHANNEL_WIDTH    0x2000
+
+static void bcm_phy_write_misc(struct phy_device *phydev,
+			       u16 reg, u16 chl, u16 value)
+{
+	int reg_val;
+
+	phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54xx_AUXCNTL,
+		  MIIM_BCM_AUXCNTL_SHDWSEL_MISC);
+
+	reg_val = phy_read(phydev, MDIO_DEVAD_NONE, MIIM_BCM54xx_AUXCNTL);
+	reg_val |= MIIM_BCM_AUXCNTL_ACTL_SMDSP_EN;
+	phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54xx_AUXCNTL, reg_val);
+
+	reg_val = (chl * MIIM_BCM_CHANNEL_WIDTH) | reg;
+	phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_EXP_SEL, reg_val);
+
+	phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_EXP_DATA, value);
+}
+
 /* Broadcom BCM5461S */
 static int bcm5461_config(struct phy_device *phydev)
 {
@@ -152,11 +175,50 @@ static int bcm_cygnus_startup(struct phy_device *phydev)
 	return genphy_parse_link(phydev);
 }
 
+static void bcm_cygnus_afe(struct phy_device *phydev)
+{
+	/* ensures smdspclk is enabled */
+	phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54xx_AUXCNTL, 0x0c30);
+
+	/* AFE_VDAC_ICTRL_0 bit 7:4 Iq=1100 for 1g 10bt, normal modes */
+	bcm_phy_write_misc(phydev, 0x39, 0x01, 0xA7C8);
+
+	/* AFE_HPF_TRIM_OTHERS bit11=1, short cascode for all modes*/
+	bcm_phy_write_misc(phydev, 0x3A, 0x00, 0x0803);
+
+	/* AFE_TX_CONFIG_1 bit 7:4 Iq=1100 for test modes */
+	bcm_phy_write_misc(phydev, 0x3A, 0x01, 0xA740);
+
+	/* AFE TEMPSEN_OTHERS rcal_HT, rcal_LT 10000 */
+	bcm_phy_write_misc(phydev, 0x3A, 0x03, 0x8400);
+
+	/* AFE_FUTURE_RSV bit 2:0 rccal <2:0>=100 */
+	bcm_phy_write_misc(phydev, 0x3B, 0x00, 0x0004);
+
+	/* Adjust bias current trim to overcome digital offSet */
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x1E, 0x02);
+
+	/* make rcal=100, since rdb default is 000 */
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x17, 0x00B1);
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x15, 0x0010);
+
+	/* CORE_EXPB0, Reset R_CAL/RC_CAL Engine */
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x17, 0x00B0);
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x15, 0x0010);
+
+	/* CORE_EXPB0, Disable Reset R_CAL/RC_CAL Engine */
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x17, 0x00B0);
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x15, 0x0000);
+}
+
 static int bcm_cygnus_config(struct phy_device *phydev)
 {
 	genphy_config_aneg(phydev);
-
 	phy_reset(phydev);
+	/* AFE settings for PHY stability */
+	bcm_cygnus_afe(phydev);
+	/* Forcing aneg after applying the AFE settings */
+	genphy_restart_aneg(phydev);
 
 	return 0;
 }
-- 
1.9.1