| Message ID | 20200917135707.12563-6-geert+renesas@glider.be (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Geert Uytterhoeven |
| Headers | show |
| Series | net/ravb: Add support for explicit internal clock delay configuration | expand |
Geert On 9/17/20 8:57 AM, Geert Uytterhoeven wrote: > Some EtherAVB variants support internal clock delay configuration, which > can add larger delays than the delays that are typically supported by > the PHY (using an "rgmii-*id" PHY mode, and/or "[rt]xc-skew-ps" > properties). > > Historically, the EtherAVB driver configured these delays based on the > "rgmii-*id" PHY mode. This caused issues with PHY drivers that > implement PHY internal delays properly[1]. Hence a backwards-compatible > workaround was added by masking the PHY mode[2]. > > Add proper support for explicit configuration of the MAC internal clock > delays using the new "[rt]x-internal-delay-ps" properties. > Fall back to the old handling if none of these properties is present. > > [1] Commit bcf3440c6dd78bfe ("net: phy: micrel: add phy-mode support for > the KSZ9031 PHY") > [2] Commit 9b23203c32ee02cd ("ravb: Mask PHY mode to avoid inserting > delays twice"). > > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> > Reviewed-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> > Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> > --- > v4: > - Add Reviewed-by, > > v3: > - No changes, > > v2: > - Add Reviewed-by, > - Split long line, > - Replace "renesas,[rt]xc-delay-ps" by "[rt]x-internal-delay-ps", > - Use 1 instead of true when assigning to a single-bit bitfield. > --- > drivers/net/ethernet/renesas/ravb.h | 1 + > drivers/net/ethernet/renesas/ravb_main.c | 36 ++++++++++++++++++------ > 2 files changed, 28 insertions(+), 9 deletions(-) > > diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h > index e5ca12ce93c730a9..7453b17a37a2c8d0 100644 > --- a/drivers/net/ethernet/renesas/ravb.h > +++ b/drivers/net/ethernet/renesas/ravb.h > @@ -1038,6 +1038,7 @@ struct ravb_private { > unsigned wol_enabled:1; > unsigned rxcidm:1; /* RX Clock Internal Delay Mode */ > unsigned txcidm:1; /* TX Clock Internal Delay Mode */ > + unsigned rgmii_override:1; /* Deprecated rgmii-*id behavior */ > int num_tx_desc; /* TX descriptors per packet */ > }; > > diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c > index 59dadd971345e0d1..aa120e3f1e4d4da5 100644 > --- a/drivers/net/ethernet/renesas/ravb_main.c > +++ b/drivers/net/ethernet/renesas/ravb_main.c > @@ -1034,11 +1034,8 @@ static int ravb_phy_init(struct net_device *ndev) > pn = of_node_get(np); > } > > - iface = priv->phy_interface; > - if (priv->chip_id != RCAR_GEN2 && phy_interface_mode_is_rgmii(iface)) { > - /* ravb_set_delay_mode() takes care of internal delay mode */ > - iface = PHY_INTERFACE_MODE_RGMII; > - } > + iface = priv->rgmii_override ? PHY_INTERFACE_MODE_RGMII > + : priv->phy_interface; > phydev = of_phy_connect(ndev, pn, ravb_adjust_link, 0, iface); > of_node_put(pn); > if (!phydev) { > @@ -1989,20 +1986,41 @@ static const struct soc_device_attribute ravb_delay_mode_quirk_match[] = { > }; > > /* Set tx and rx clock internal delay modes */ > -static void ravb_parse_delay_mode(struct net_device *ndev) > +static void ravb_parse_delay_mode(struct device_node *np, struct net_device *ndev) > { > struct ravb_private *priv = netdev_priv(ndev); > + bool explicit_delay = false; > + u32 delay; > + > + if (!of_property_read_u32(np, "rx-internal-delay-ps", &delay)) { > + /* Valid values are 0 and 1800, according to DT bindings */ > + priv->rxcidm = !!delay; > + explicit_delay = true; > + } > + if (!of_property_read_u32(np, "tx-internal-delay-ps", &delay)) { > + /* Valid values are 0 and 2000, according to DT bindings */ > + priv->txcidm = !!delay; > + explicit_delay = true; > + } There are helper functions for this s32 phy_get_internal_delay(struct phy_device *phydev, struct device *dev, const int *delay_values, int size, bool is_rx)
Hi Dan, On Thu, Sep 17, 2020 at 8:50 PM Dan Murphy <dmurphy@ti.com> wrote: > On 9/17/20 8:57 AM, Geert Uytterhoeven wrote: > > Some EtherAVB variants support internal clock delay configuration, which > > can add larger delays than the delays that are typically supported by > > the PHY (using an "rgmii-*id" PHY mode, and/or "[rt]xc-skew-ps" > > properties). > > > > Historically, the EtherAVB driver configured these delays based on the > > "rgmii-*id" PHY mode. This caused issues with PHY drivers that > > implement PHY internal delays properly[1]. Hence a backwards-compatible > > workaround was added by masking the PHY mode[2]. > > > > Add proper support for explicit configuration of the MAC internal clock > > delays using the new "[rt]x-internal-delay-ps" properties. > > Fall back to the old handling if none of these properties is present. > > > > [1] Commit bcf3440c6dd78bfe ("net: phy: micrel: add phy-mode support for > > the KSZ9031 PHY") > > [2] Commit 9b23203c32ee02cd ("ravb: Mask PHY mode to avoid inserting > > delays twice"). > > > > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> > > Reviewed-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> > > Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> > > @@ -1989,20 +1986,41 @@ static const struct soc_device_attribute ravb_delay_mode_quirk_match[] = { > > }; > > > > /* Set tx and rx clock internal delay modes */ > > -static void ravb_parse_delay_mode(struct net_device *ndev) > > +static void ravb_parse_delay_mode(struct device_node *np, struct net_device *ndev) > > { > > struct ravb_private *priv = netdev_priv(ndev); > > + bool explicit_delay = false; > > + u32 delay; > > + > > + if (!of_property_read_u32(np, "rx-internal-delay-ps", &delay)) { > > + /* Valid values are 0 and 1800, according to DT bindings */ > > + priv->rxcidm = !!delay; > > + explicit_delay = true; > > + } > > + if (!of_property_read_u32(np, "tx-internal-delay-ps", &delay)) { > > + /* Valid values are 0 and 2000, according to DT bindings */ > > + priv->txcidm = !!delay; > > + explicit_delay = true; > > + } > There are helper functions for this > > s32 phy_get_internal_delay(struct phy_device *phydev, struct device > *dev, const int *delay_values, int size, bool is_rx) That helper operates on the PHY device, not on the MAC device. Cfr. what I stated in the cover letter: This can be considered the MAC counterpart of commit 9150069bf5fc0e86 ("dt-bindings: net: Add tx and rx internal delays"), which applies to the PHY. Note that unlike commit 92252eec913b2dd5 ("net: phy: Add a helper to return the index for of the internal delay"), no helpers are provided to parse the DT properties, as so far there is a single user only, which supports only zero or a single fixed value. Of course such helpers can be added later, when the need arises, or when deemed useful otherwise. Gr{oetje,eeting}s, Geert
diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h index e5ca12ce93c730a9..7453b17a37a2c8d0 100644 --- a/drivers/net/ethernet/renesas/ravb.h +++ b/drivers/net/ethernet/renesas/ravb.h @@ -1038,6 +1038,7 @@ struct ravb_private { unsigned wol_enabled:1; unsigned rxcidm:1; /* RX Clock Internal Delay Mode */ unsigned txcidm:1; /* TX Clock Internal Delay Mode */ + unsigned rgmii_override:1; /* Deprecated rgmii-*id behavior */ int num_tx_desc; /* TX descriptors per packet */ }; diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c index 59dadd971345e0d1..aa120e3f1e4d4da5 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -1034,11 +1034,8 @@ static int ravb_phy_init(struct net_device *ndev) pn = of_node_get(np); } - iface = priv->phy_interface; - if (priv->chip_id != RCAR_GEN2 && phy_interface_mode_is_rgmii(iface)) { - /* ravb_set_delay_mode() takes care of internal delay mode */ - iface = PHY_INTERFACE_MODE_RGMII; - } + iface = priv->rgmii_override ? PHY_INTERFACE_MODE_RGMII + : priv->phy_interface; phydev = of_phy_connect(ndev, pn, ravb_adjust_link, 0, iface); of_node_put(pn); if (!phydev) { @@ -1989,20 +1986,41 @@ static const struct soc_device_attribute ravb_delay_mode_quirk_match[] = { }; /* Set tx and rx clock internal delay modes */ -static void ravb_parse_delay_mode(struct net_device *ndev) +static void ravb_parse_delay_mode(struct device_node *np, struct net_device *ndev) { struct ravb_private *priv = netdev_priv(ndev); + bool explicit_delay = false; + u32 delay; + + if (!of_property_read_u32(np, "rx-internal-delay-ps", &delay)) { + /* Valid values are 0 and 1800, according to DT bindings */ + priv->rxcidm = !!delay; + explicit_delay = true; + } + if (!of_property_read_u32(np, "tx-internal-delay-ps", &delay)) { + /* Valid values are 0 and 2000, according to DT bindings */ + priv->txcidm = !!delay; + explicit_delay = true; + } + if (explicit_delay) + return; + + /* Fall back to legacy rgmii-*id behavior */ if (priv->phy_interface == PHY_INTERFACE_MODE_RGMII_ID || - priv->phy_interface == PHY_INTERFACE_MODE_RGMII_RXID) + priv->phy_interface == PHY_INTERFACE_MODE_RGMII_RXID) { priv->rxcidm = 1; + priv->rgmii_override = 1; + } if (priv->phy_interface == PHY_INTERFACE_MODE_RGMII_ID || priv->phy_interface == PHY_INTERFACE_MODE_RGMII_TXID) { if (!WARN(soc_device_match(ravb_delay_mode_quirk_match), "phy-mode %s requires TX clock internal delay mode which is not supported by this hardware revision. Please update device tree", - phy_modes(priv->phy_interface))) + phy_modes(priv->phy_interface))) { priv->txcidm = 1; + priv->rgmii_override = 1; + } } } @@ -2148,7 +2166,7 @@ static int ravb_probe(struct platform_device *pdev) ravb_modify(ndev, GCCR, GCCR_LTI, GCCR_LTI); if (priv->chip_id != RCAR_GEN2) { - ravb_parse_delay_mode(ndev); + ravb_parse_delay_mode(np, ndev); ravb_set_delay_mode(ndev); }
Some EtherAVB variants support internal clock delay configuration, which can add larger delays than the delays that are typically supported by the PHY (using an "rgmii-*id" PHY mode, and/or "[rt]xc-skew-ps" properties). Historically, the EtherAVB driver configured these delays based on the "rgmii-*id" PHY mode. This caused issues with PHY drivers that implement PHY internal delays properly[1]. Hence a backwards-compatible workaround was added by masking the PHY mode[2]. Add proper support for explicit configuration of the MAC internal clock delays using the new "[rt]x-internal-delay-ps" properties. Fall back to the old handling if none of these properties is present. [1] Commit bcf3440c6dd78bfe ("net: phy: micrel: add phy-mode support for the KSZ9031 PHY") [2] Commit 9b23203c32ee02cd ("ravb: Mask PHY mode to avoid inserting delays twice"). Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> --- v4: - Add Reviewed-by, v3: - No changes, v2: - Add Reviewed-by, - Split long line, - Replace "renesas,[rt]xc-delay-ps" by "[rt]x-internal-delay-ps", - Use 1 instead of true when assigning to a single-bit bitfield. --- drivers/net/ethernet/renesas/ravb.h | 1 + drivers/net/ethernet/renesas/ravb_main.c | 36 ++++++++++++++++++------ 2 files changed, 28 insertions(+), 9 deletions(-)