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net: dsa: mv88e6xxx: workaround RGMII transmit delay erratum for 6320 family

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commit 1ebc8e1ef906db9c08e9abe9776d85ddec837725 upstream.

Implement the workaround for erratum
  3.3 RGMII timing may be out of spec when transmit delay is enabled
for the 6320 family, which says:

  When transmit delay is enabled via Port register 1 bit 14 = 1, duty
  cycle may be out of spec. Under very rare conditions this may cause
  the attached device receive CRC errors.

Signed-off-by: Marek Behún <kabel@kernel.org>
Cc: <stable@vger.kernel.org> # 5.4.x
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20250317173250.28780-8-kabel@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marek Behún
2025-03-17 18:32:50 +01:00
committed by Greg Kroah-Hartman
parent 7a083ad29f
commit 64baf64684
1 changed files with 17 additions and 0 deletions
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17
drivers/net/dsa/mv88e6xxx/chip.c
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@@ -3555,6 +3555,21 @@ static int mv88e6xxx_stats_setup(struct mv88e6xxx_chip *chip)
return mv88e6xxx_g1_stats_clear(chip);
}
static int mv88e6320_setup_errata(struct mv88e6xxx_chip *chip)
{
u16 dummy;
int err;
/* Workaround for erratum
* 3.3 RGMII timing may be out of spec when transmit delay is enabled
*/
err = mv88e6xxx_port_hidden_write(chip, 0, 0xf, 0x7, 0xe000);
if (err)
return err;
return mv88e6xxx_port_hidden_read(chip, 0, 0xf, 0x7, &dummy);
}
/* Check if the errata has already been applied. */
static bool mv88e6390_setup_errata_applied(struct mv88e6xxx_chip *chip)
{
@@ -5005,6 +5020,7 @@ static const struct mv88e6xxx_ops mv88e6290_ops = {
static const struct mv88e6xxx_ops mv88e6320_ops = {
/* MV88E6XXX_FAMILY_6320 */
.setup_errata = mv88e6320_setup_errata,
.ieee_pri_map = mv88e6085_g1_ieee_pri_map,
.ip_pri_map = mv88e6085_g1_ip_pri_map,
.irl_init_all = mv88e6352_g2_irl_init_all,
@@ -5054,6 +5070,7 @@ static const struct mv88e6xxx_ops mv88e6320_ops = {
static const struct mv88e6xxx_ops mv88e6321_ops = {
/* MV88E6XXX_FAMILY_6320 */
.setup_errata = mv88e6320_setup_errata,
.ieee_pri_map = mv88e6085_g1_ieee_pri_map,
.ip_pri_map = mv88e6085_g1_ip_pri_map,
.irl_init_all = mv88e6352_g2_irl_init_all,