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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Russell King , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Rasmus Villemoes , "Benny (Ying-Tsan) Weng" , John Crispin Subject: Re: [PATCH net v4 4/4] net: dsa: mxl-gsw1xx: manually clear RANEG bit Message-ID: <20251210155249.bpjm2hkvujstxt4i@skbuf> References: <76745fceb5a3f53088110fb7a96acf88434088ca.1765241054.git.daniel@makrotopia.org> <76745fceb5a3f53088110fb7a96acf88434088ca.1765241054.git.daniel@makrotopia.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <76745fceb5a3f53088110fb7a96acf88434088ca.1765241054.git.daniel@makrotopia.org> <76745fceb5a3f53088110fb7a96acf88434088ca.1765241054.git.daniel@makrotopia.org> On Tue, Dec 09, 2025 at 01:29:34AM +0000, Daniel Golle wrote: > Despite being documented as self-clearing, the RANEG bit sometimes > remains set, preventing auto-negotiation from happening. > > Manually clear the RANEG bit after 10ms as advised by MaxLinear. > In order to not hold RTNL during the 10ms of waiting schedule > delayed work to take care of clearing the bit asynchronously, which > is similar to the self-clearing behavior. > > Fixes: 22335939ec90 ("net: dsa: add driver for MaxLinear GSW1xx switch family") > Reported-by: Rasmus Villemoes > Signed-off-by: Daniel Golle > --- > v4: > * fix order of operations in remove and shutdown functions > > v3: > * fix wrong parameter name in call of cancel_delayed_work_sync > > v2: > * cancel pending work before setting RANEG bit > * cancel pending work on remove and shutdown > * document that GSW1XX_RST_REQ_SGMII_SHELL also clears RANEG bit > * improve commit message > > drivers/net/dsa/lantiq/mxl-gsw1xx.c | 34 ++++++++++++++++++++++++++++- > 1 file changed, 33 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/dsa/lantiq/mxl-gsw1xx.c b/drivers/net/dsa/lantiq/mxl-gsw1xx.c > index 4dc287ad141e1..f8ff8a604bf53 100644 > --- a/drivers/net/dsa/lantiq/mxl-gsw1xx.c > +++ b/drivers/net/dsa/lantiq/mxl-gsw1xx.c > @@ -11,10 +11,12 @@ > > #include > #include > +#include > #include > #include > #include > #include > +#include > #include > > #include "lantiq_gswip.h" > @@ -29,6 +31,7 @@ struct gsw1xx_priv { > struct regmap *clk; > struct regmap *shell; > struct phylink_pcs pcs; > + struct delayed_work clear_raneg; > phy_interface_t tbi_interface; > struct gswip_priv gswip; > }; > @@ -145,7 +148,9 @@ static void gsw1xx_pcs_disable(struct phylink_pcs *pcs) > { > struct gsw1xx_priv *priv = pcs_to_gsw1xx(pcs); > > - /* Assert SGMII shell reset */ > + cancel_delayed_work_sync(&priv->clear_raneg); > + > + /* Assert SGMII shell reset (will also clear RANEG bit) */ > regmap_set_bits(priv->shell, GSW1XX_SHELL_RST_REQ, > GSW1XX_RST_REQ_SGMII_SHELL); > > @@ -428,12 +433,29 @@ static int gsw1xx_pcs_config(struct phylink_pcs *pcs, unsigned int neg_mode, > return 0; > } > > +static void gsw1xx_pcs_clear_raneg(struct work_struct *work) > +{ > + struct gsw1xx_priv *priv = > + container_of(work, struct gsw1xx_priv, clear_raneg.work); > + > + regmap_clear_bits(priv->sgmii, GSW1XX_SGMII_TBI_ANEGCTL, > + GSW1XX_SGMII_TBI_ANEGCTL_RANEG); > +} > + > static void gsw1xx_pcs_an_restart(struct phylink_pcs *pcs) > { > struct gsw1xx_priv *priv = pcs_to_gsw1xx(pcs); > > + cancel_delayed_work_sync(&priv->clear_raneg); > + > regmap_set_bits(priv->sgmii, GSW1XX_SGMII_TBI_ANEGCTL, > GSW1XX_SGMII_TBI_ANEGCTL_RANEG); > + > + /* despite being documented as self-clearing, the RANEG bit > + * sometimes remains set, preventing auto-negotiation from happening. > + * MaxLinear advises to manually clear the bit after 10ms. > + */ > + schedule_delayed_work(&priv->clear_raneg, msecs_to_jiffies(10)); > } > > static void gsw1xx_pcs_link_up(struct phylink_pcs *pcs, > @@ -636,6 +658,8 @@ static int gsw1xx_probe(struct mdio_device *mdiodev) > if (ret) > return ret; > > + INIT_DELAYED_WORK(&priv->clear_raneg, gsw1xx_pcs_clear_raneg); > + > ret = gswip_probe_common(&priv->gswip, version); > if (ret) > return ret; > @@ -648,16 +672,21 @@ static int gsw1xx_probe(struct mdio_device *mdiodev) > static void gsw1xx_remove(struct mdio_device *mdiodev) > { > struct gswip_priv *priv = dev_get_drvdata(&mdiodev->dev); > + struct gsw1xx_priv *gsw1xx_priv; > > if (!priv) > return; > > dsa_unregister_switch(priv->ds); > + > + gsw1xx_priv = container_of(priv, struct gsw1xx_priv, gswip); > + cancel_delayed_work_sync(&gsw1xx_priv->clear_raneg); > } > > static void gsw1xx_shutdown(struct mdio_device *mdiodev) > { > struct gswip_priv *priv = dev_get_drvdata(&mdiodev->dev); > + struct gsw1xx_priv *gsw1xx_priv; > > if (!priv) > return; > @@ -665,6 +694,9 @@ static void gsw1xx_shutdown(struct mdio_device *mdiodev) > dsa_switch_shutdown(priv->ds); > > dev_set_drvdata(&mdiodev->dev, NULL); > + > + gsw1xx_priv = container_of(priv, struct gsw1xx_priv, gswip); > + cancel_delayed_work_sync(&gsw1xx_priv->clear_raneg); Nitpick: why did you place this after dev_set_drvdata(dev, NULL) and not before? The work item doesn't call dev_get_drvdata(), true, but it's one more refactoring step that needs to be taken care of if it should. > } > > static const struct gswip_hw_info gsw12x_data = { > -- > 2.52.0