hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

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: Robert Hancock <hancock@sedsystems.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Robert Hancock 2019-06-12 14:49:05 -06:00 committed by David S. Miller
parent 7c86f20d15
commit 1fc3319918
2 changed files with 63 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
drivers/net/dsa/microchip/ksz9477.c
View File

@ -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;
}

1
drivers/net/dsa/microchip/ksz_priv.h
View File

@ -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;