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net: dsa: mv88e6xxx: Add fix for erratum 5.2 of 88E6393X family

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Add fix for erratum 5.2 of the 88E6393X (Amethyst) family: for 10gbase-r
mode, some undocumented registers need to be written some special
values.

Fixes: de776d0d31 ("net: dsa: mv88e6xxx: add support for mv88e6393x family")
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marek Behún 2021-11-30 18:01:49 +01:00 committed by David S. Miller
parent 7527d66260
commit 93fd8207be
1 changed files with 48 additions and 0 deletions
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48
drivers/net/dsa/mv88e6xxx/serdes.c
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@ -1375,6 +1375,50 @@ static int mv88e6393x_serdes_erratum_4_8(struct mv88e6xxx_chip *chip, int lane)
MV88E6393X_ERRATA_4_8_REG, reg);
}
static int mv88e6393x_serdes_erratum_5_2(struct mv88e6xxx_chip *chip, int lane,
u8 cmode)
{
static const struct {
u16 dev, reg, val, mask;
} fixes[] = {
{ MDIO_MMD_VEND1, 0x8093, 0xcb5a, 0xffff },
{ MDIO_MMD_VEND1, 0x8171, 0x7088, 0xffff },
{ MDIO_MMD_VEND1, 0x80c9, 0x311a, 0xffff },
{ MDIO_MMD_VEND1, 0x80a2, 0x8000, 0xff7f },
{ MDIO_MMD_VEND1, 0x80a9, 0x0000, 0xfff0 },
{ MDIO_MMD_VEND1, 0x80a3, 0x0000, 0xf8ff },
{ MDIO_MMD_PHYXS, MV88E6393X_SERDES_POC,
MV88E6393X_SERDES_POC_RESET, MV88E6393X_SERDES_POC_RESET },
};
int err, i;
u16 reg;
/* mv88e6393x family errata 5.2:
* For optimal signal integrity the following sequence should be applied
* to SERDES operating in 10G mode. These registers only apply to 10G
* operation and have no effect on other speeds.
*/
if (cmode != MV88E6393X_PORT_STS_CMODE_10GBASER)
return 0;
for (i = 0; i < ARRAY_SIZE(fixes); ++i) {
err = mv88e6390_serdes_read(chip, lane, fixes[i].dev,
fixes[i].reg, &reg);
if (err)
return err;
reg &= ~fixes[i].mask;
reg |= fixes[i].val;
err = mv88e6390_serdes_write(chip, lane, fixes[i].dev,
fixes[i].reg, reg);
if (err)
return err;
}
return 0;
}
int mv88e6393x_serdes_power(struct mv88e6xxx_chip *chip, int port, int lane,
bool on)
{
@ -1389,6 +1433,10 @@ int mv88e6393x_serdes_power(struct mv88e6xxx_chip *chip, int port, int lane,
if (err)
return err;
err = mv88e6393x_serdes_erratum_5_2(chip, lane, cmode);
if (err)
return err;
err = mv88e6393x_serdes_power_lane(chip, lane, true);
if (err)
return err;