Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 1fc33199 authored by Robert Hancock's avatar Robert Hancock Committed by David S. Miller
Browse files

net: dsa: microchip: Add PHY errata workarounds 



The Silicon Errata and Data Sheet Clarification documents for the
KSZ9477 series of chips describe a number of otherwise undocumented PHY
register settings which are required to work around various chip errata.
Apply these settings when initializing the PHY ports on these chips.

Signed-off-by: default avatarRobert Hancock <hancock@sedsystems.ca>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7c86f20d

drivers/net/dsa/microchip/ksz9477.c

+62 −0
Original line number Diff line number Diff line
@@ -1165,6 +1165,62 @@ static phy_interface_t ksz9477_get_interface(struct ksz_device *dev, int port) 
	return interface;

}



static void ksz9477_port_mmd_write(struct ksz_device *dev, int port,

				   u8 dev_addr, u16 reg_addr, u16 val)

{

	ksz_pwrite16(dev, port, REG_PORT_PHY_MMD_SETUP,

		     MMD_SETUP(PORT_MMD_OP_INDEX, dev_addr));

	ksz_pwrite16(dev, port, REG_PORT_PHY_MMD_INDEX_DATA, reg_addr);

	ksz_pwrite16(dev, port, REG_PORT_PHY_MMD_SETUP,

		     MMD_SETUP(PORT_MMD_OP_DATA_NO_INCR, dev_addr));

	ksz_pwrite16(dev, port, REG_PORT_PHY_MMD_INDEX_DATA, val);

}



static void ksz9477_phy_errata_setup(struct ksz_device *dev, int port)

{

	/* Apply PHY settings to address errata listed in

	 * KSZ9477, KSZ9897, KSZ9896, KSZ9567, KSZ8565

	 * Silicon Errata and Data Sheet Clarification documents:

	 *

	 * Register settings are needed to improve PHY receive performance

	 */

	ksz9477_port_mmd_write(dev, port, 0x01, 0x6f, 0xdd0b);

	ksz9477_port_mmd_write(dev, port, 0x01, 0x8f, 0x6032);

	ksz9477_port_mmd_write(dev, port, 0x01, 0x9d, 0x248c);

	ksz9477_port_mmd_write(dev, port, 0x01, 0x75, 0x0060);

	ksz9477_port_mmd_write(dev, port, 0x01, 0xd3, 0x7777);

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x06, 0x3008);

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x08, 0x2001);



	/* Transmit waveform amplitude can be improved

	 * (1000BASE-T, 100BASE-TX, 10BASE-Te)

	 */

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x04, 0x00d0);



	/* Energy Efficient Ethernet (EEE) feature select must

	 * be manually disabled (except on KSZ8565 which is 100Mbit)

	 */

	if (dev->features & GBIT_SUPPORT)

		ksz9477_port_mmd_write(dev, port, 0x07, 0x3c, 0x0000);



	/* Register settings are required to meet data sheet

	 * supply current specifications

	 */

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x13, 0x6eff);

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x14, 0xe6ff);

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x15, 0x6eff);

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x16, 0xe6ff);

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x17, 0x00ff);

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x18, 0x43ff);

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x19, 0xc3ff);

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x1a, 0x6fff);

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x1b, 0x07ff);

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x1c, 0x0fff);

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x1d, 0xe7ff);

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x1e, 0xefff);

	ksz9477_port_mmd_write(dev, port, 0x1c, 0x20, 0xeeee);

}



static void ksz9477_port_setup(struct ksz_device *dev, int port, bool cpu_port)

{

	u8 data8;
@@ -1203,6 +1259,8 @@ static void ksz9477_port_setup(struct ksz_device *dev, int port, bool cpu_port) 
			     PORT_FORCE_TX_FLOW_CTRL | PORT_FORCE_RX_FLOW_CTRL,

			     false);



		if (dev->phy_errata_9477)

			ksz9477_phy_errata_setup(dev, port);

	} else {

		/* force flow control */

		ksz_port_cfg(dev, port, REG_PORT_CTRL_0,
@@ -1474,6 +1532,7 @@ struct ksz_chip_data { 
	int num_statics;

	int cpu_ports;

	int port_cnt;

	bool phy_errata_9477;

};



static const struct ksz_chip_data ksz9477_switch_chips[] = {
@@ -1485,6 +1544,7 @@ static const struct ksz_chip_data ksz9477_switch_chips[] = { 
		.num_statics = 16,

		.cpu_ports = 0x7F,	/* can be configured as cpu port */

		.port_cnt = 7,		/* total physical port count */

		.phy_errata_9477 = true,

	},

	{

		.chip_id = 0x00989700,
@@ -1494,6 +1554,7 @@ static const struct ksz_chip_data ksz9477_switch_chips[] = { 
		.num_statics = 16,

		.cpu_ports = 0x7F,	/* can be configured as cpu port */

		.port_cnt = 7,		/* total physical port count */

		.phy_errata_9477 = true,

	},

	{

		.chip_id = 0x00989300,
@@ -1522,6 +1583,7 @@ static int ksz9477_switch_init(struct ksz_device *dev) 
			dev->num_statics = chip->num_statics;

			dev->port_cnt = chip->port_cnt;

			dev->cpu_ports = chip->cpu_ports;

			dev->phy_errata_9477 = chip->phy_errata_9477;



			break;

		}

drivers/net/dsa/microchip/ksz_priv.h

+1 −0
Original line number Diff line number Diff line
@@ -77,6 +77,7 @@ struct ksz_device { 
	int last_port;			/* ports after that not used */

	phy_interface_t interface;

	u32 regs_size;

	bool phy_errata_9477;



	struct vlan_table *vlan_cache;