Commit b718e8c8 authored by Alvaro Gamez Machado's avatar Alvaro Gamez Machado Committed by David S. Miller
Browse files

net: phy: dp83822: use BMCR_ANENABLE instead of BMSR_ANEGCAPABLE for DP83620 

DP83620 register set is compatible with the DP83848, but it also supports
100base-FX. When the hardware is configured such as that fiber mode is
enabled, autonegotiation is not possible.

The chip, however, doesn't expose this information via BMSR_ANEGCAPABLE.
Instead, this bit is always set high, even if the particular hardware
configuration makes it so that auto negotiation is not possible [1]. Under
these circumstances, the phy subsystem keeps trying for autonegotiation to
happen, without success.

Hereby, we inspect BMCR_ANENABLE bit after genphy_config_init, which on
reset is set to 0 when auto negotiation is disabled, and so we use this
value instead of BMSR_ANEGCAPABLE.

[1] https://e2e.ti.com/support/interface/ethernet/f/903/p/697165/2571170



Signed-off-by: default avatarAlvaro Gamez Machado <alvaro.gamez@hazent.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6d8c50dc

drivers/net/phy/dp83848.c

+29 −6
Original line number Diff line number Diff line
@@ -74,6 +74,25 @@ static int dp83848_config_intr(struct phy_device *phydev) 
	return phy_write(phydev, DP83848_MICR, control);

}



static int dp83848_config_init(struct phy_device *phydev)

{

	int err;

	int val;



	err = genphy_config_init(phydev);

	if (err < 0)

		return err;



	/* DP83620 always reports Auto Negotiation Ability on BMSR. Instead,

	 * we check initial value of BMCR Auto negotiation enable bit

	 */

	val = phy_read(phydev, MII_BMCR);

	if (!(val & BMCR_ANENABLE))

		phydev->autoneg = AUTONEG_DISABLE;



	return 0;

}



static struct mdio_device_id __maybe_unused dp83848_tbl[] = {

	{ TI_DP83848C_PHY_ID, 0xfffffff0 },

	{ NS_DP83848C_PHY_ID, 0xfffffff0 },
@@ -83,7 +102,7 @@ static struct mdio_device_id __maybe_unused dp83848_tbl[] = { 
};

MODULE_DEVICE_TABLE(mdio, dp83848_tbl);



#define DP83848_PHY_DRIVER(_id, _name)				\

#define DP83848_PHY_DRIVER(_id, _name, _config_init)		\

	{							\

		.phy_id		= _id,				\

		.phy_id_mask	= 0xfffffff0,			\
@@ -92,7 +111,7 @@ MODULE_DEVICE_TABLE(mdio, dp83848_tbl); 
		.flags		= PHY_HAS_INTERRUPT,		\

								\

		.soft_reset	= genphy_soft_reset,		\

		.config_init	= genphy_config_init,		\

		.config_init	= _config_init,			\

		.suspend	= genphy_suspend,		\

		.resume		= genphy_resume,		\

								\
@@ -102,10 +121,14 @@ MODULE_DEVICE_TABLE(mdio, dp83848_tbl); 
	}



static struct phy_driver dp83848_driver[] = {

	DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY"),

	DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY"),

	DP83848_PHY_DRIVER(TI_DP83620_PHY_ID, "TI DP83620 10/100 Mbps PHY"),

	DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY"),

	DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY",

			   genphy_config_init),

	DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY",

			   genphy_config_init),

	DP83848_PHY_DRIVER(TI_DP83620_PHY_ID, "TI DP83620 10/100 Mbps PHY",

			   dp83848_config_init),

	DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY",

			   genphy_config_init),

};

module_phy_driver(dp83848_driver);

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