In fact it was a series of 6 patches, but the 2nd was without fixes tag: 21635d9203e1cf2b73b67e9a86059a62f62a3563 8c3318b4874e2dee867f5ae8f6d38f78e044bf71 (without fixes tag) 7527d66260ac0c603c6baca5146748061fcddbd6 (didnt apply) 93fd8207bed80ce19aaf59932cbe1c03d418a37d 163000dbc772c1eae9bdfe7c8fe30155db1efd74 ede359d8843a2779d232ed30bc36089d4b5962e4 On Sat, 04 Dec 2021 11:28:35 +0100 <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > The patch below does not apply to the 5.15-stable tree. > If someone wants it applied there, or to any other stable or longterm > tree, then please email the backport, including the original git commit > id to <stable@xxxxxxxxxxxxxxx>. > > thanks, > > greg k-h > > ------------------ original commit in Linus's tree ------------------ > > From 7527d66260ac0c603c6baca5146748061fcddbd6 Mon Sep 17 00:00:00 2001 > From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@xxxxxxxxxx> > Date: Tue, 30 Nov 2021 18:01:48 +0100 > Subject: [PATCH] net: dsa: mv88e6xxx: Save power by disabling SerDes > trasmitter and receiver > MIME-Version: 1.0 > Content-Type: text/plain; charset=UTF-8 > Content-Transfer-Encoding: 8bit > > Save power on 88E6393X by disabling SerDes receiver and transmitter > after SerDes is SerDes is disabled. > > Signed-off-by: Marek Behún <kabel@xxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx # de776d0d316f ("net: dsa: mv88e6xxx: add support for mv88e6393x family") > Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> > > diff --git a/drivers/net/dsa/mv88e6xxx/serdes.c b/drivers/net/dsa/mv88e6xxx/serdes.c > index 3a6244596a67..ceb63d7f1f97 100644 > --- a/drivers/net/dsa/mv88e6xxx/serdes.c > +++ b/drivers/net/dsa/mv88e6xxx/serdes.c > @@ -1271,6 +1271,28 @@ void mv88e6390_serdes_get_regs(struct mv88e6xxx_chip *chip, int port, void *_p) > } > } > > +static int mv88e6393x_serdes_power_lane(struct mv88e6xxx_chip *chip, int lane, > + bool on) > +{ > + u16 reg; > + int err; > + > + err = mv88e6390_serdes_read(chip, lane, MDIO_MMD_PHYXS, > + MV88E6393X_SERDES_CTRL1, ®); > + if (err) > + return err; > + > + if (on) > + reg &= ~(MV88E6393X_SERDES_CTRL1_TX_PDOWN | > + MV88E6393X_SERDES_CTRL1_RX_PDOWN); > + else > + reg |= MV88E6393X_SERDES_CTRL1_TX_PDOWN | > + MV88E6393X_SERDES_CTRL1_RX_PDOWN; > + > + return mv88e6390_serdes_write(chip, lane, MDIO_MMD_PHYXS, > + MV88E6393X_SERDES_CTRL1, reg); > +} > + > static int mv88e6393x_serdes_erratum_4_6(struct mv88e6xxx_chip *chip, int lane) > { > u16 reg; > @@ -1297,7 +1319,11 @@ static int mv88e6393x_serdes_erratum_4_6(struct mv88e6xxx_chip *chip, int lane) > if (err) > return err; > > - return mv88e6390_serdes_power_sgmii(chip, lane, false); > + err = mv88e6390_serdes_power_sgmii(chip, lane, false); > + if (err) > + return err; > + > + return mv88e6393x_serdes_power_lane(chip, lane, false); > } > > int mv88e6393x_serdes_setup_errata(struct mv88e6xxx_chip *chip) > @@ -1362,17 +1388,29 @@ int mv88e6393x_serdes_power(struct mv88e6xxx_chip *chip, int port, int lane, > err = mv88e6393x_serdes_erratum_4_8(chip, lane); > if (err) > return err; > + > + err = mv88e6393x_serdes_power_lane(chip, lane, true); > + if (err) > + return err; > } > > switch (cmode) { > case MV88E6XXX_PORT_STS_CMODE_SGMII: > case MV88E6XXX_PORT_STS_CMODE_1000BASEX: > case MV88E6XXX_PORT_STS_CMODE_2500BASEX: > - return mv88e6390_serdes_power_sgmii(chip, lane, on); > + err = mv88e6390_serdes_power_sgmii(chip, lane, on); > + break; > case MV88E6393X_PORT_STS_CMODE_5GBASER: > case MV88E6393X_PORT_STS_CMODE_10GBASER: > - return mv88e6390_serdes_power_10g(chip, lane, on); > + err = mv88e6390_serdes_power_10g(chip, lane, on); > + break; > } > > - return 0; > + if (err) > + return err; > + > + if (!on) > + err = mv88e6393x_serdes_power_lane(chip, lane, false); > + > + return err; > } > diff --git a/drivers/net/dsa/mv88e6xxx/serdes.h b/drivers/net/dsa/mv88e6xxx/serdes.h > index cbb3ba30caea..e9292c8beee4 100644 > --- a/drivers/net/dsa/mv88e6xxx/serdes.h > +++ b/drivers/net/dsa/mv88e6xxx/serdes.h > @@ -93,6 +93,9 @@ > #define MV88E6393X_SERDES_POC_PCS_MASK 0x0007 > #define MV88E6393X_SERDES_POC_RESET BIT(15) > #define MV88E6393X_SERDES_POC_PDOWN BIT(5) > +#define MV88E6393X_SERDES_CTRL1 0xf003 > +#define MV88E6393X_SERDES_CTRL1_TX_PDOWN BIT(9) > +#define MV88E6393X_SERDES_CTRL1_RX_PDOWN BIT(8) > > #define MV88E6393X_ERRATA_4_8_REG 0xF074 > #define MV88E6393X_ERRATA_4_8_BIT BIT(14) >