Re: [PATCH net-next 1/2] net: pcs: xpcs: enable skip xPCS soft reset
From: Vladimir Oltean
Date: Mon Aug 09 2021 - 07:06:36 EST
Hi VK,
On Mon, Aug 09, 2021 at 06:22:28PM +0800, Wong Vee Khee wrote:
> diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
> index 63fda3fc40aa..c7a3aa862079 100644
> --- a/drivers/net/pcs/pcs-xpcs.c
> +++ b/drivers/net/pcs/pcs-xpcs.c
> @@ -1081,7 +1081,8 @@ static const struct phylink_pcs_ops xpcs_phylink_ops = {
> };
>
> struct dw_xpcs *xpcs_create(struct mdio_device *mdiodev,
> - phy_interface_t interface)
> + phy_interface_t interface,
> + bool skip_reset)
> {
> struct dw_xpcs *xpcs;
> u32 xpcs_id;
> @@ -1113,9 +1114,16 @@ struct dw_xpcs *xpcs_create(struct mdio_device *mdiodev,
> xpcs->pcs.ops = &xpcs_phylink_ops;
> xpcs->pcs.poll = true;
>
> - ret = xpcs_soft_reset(xpcs, compat);
> - if (ret)
> - goto out;
> + if (!skip_reset) {
> + dev_info(&xpcs->mdiodev->dev, "%s: xPCS soft reset\n",
> + __func__);
> + ret = xpcs_soft_reset(xpcs, compat);
> + if (ret)
> + goto out;
> + } else {
> + dev_info(&xpcs->mdiodev->dev,
> + "%s: skip xpcs soft reset\n", __func__);
> + }
I don't feel like the prints are really necessary.
>
> return xpcs;
> }
> diff --git a/include/linux/pcs/pcs-xpcs.h b/include/linux/pcs/pcs-xpcs.h
> index add077a81b21..0c05a63f3446 100644
> --- a/include/linux/pcs/pcs-xpcs.h
> +++ b/include/linux/pcs/pcs-xpcs.h
> @@ -36,7 +36,8 @@ void xpcs_validate(struct dw_xpcs *xpcs, unsigned long *supported,
> int xpcs_config_eee(struct dw_xpcs *xpcs, int mult_fact_100ns,
> int enable);
> struct dw_xpcs *xpcs_create(struct mdio_device *mdiodev,
> - phy_interface_t interface);
> + phy_interface_t interface,
> + bool xpcs_reset);
> void xpcs_destroy(struct dw_xpcs *xpcs);
>
How about exporting the reset functionality as a separate function, and
the Intel Alder Lake stmmac shim just won't call it? Like this:
-----------------------------[ cut here ]-----------------------------
diff --git a/drivers/net/dsa/sja1105/sja1105_mdio.c b/drivers/net/dsa/sja1105/sja1105_mdio.c
index 19aea8fb76f6..5acf6742da4d 100644
--- a/drivers/net/dsa/sja1105/sja1105_mdio.c
+++ b/drivers/net/dsa/sja1105/sja1105_mdio.c
@@ -437,13 +437,17 @@ static int sja1105_mdiobus_pcs_register(struct sja1105_private *priv)
goto out_pcs_free;
}
- xpcs = xpcs_create(mdiodev, priv->phy_mode[port]);
+ xpcs = xpcs_create(mdiodev);
if (IS_ERR(xpcs)) {
rc = PTR_ERR(xpcs);
goto out_pcs_free;
}
priv->xpcs[port] = xpcs;
+
+ rc = xpcs_reset(xpcs, priv->phy_mode[port]);
+ if (rc)
+ goto out_pcs_free;
}
priv->mdio_pcs = bus;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index a5d150c5f3d8..81a145009488 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -401,12 +401,15 @@ int stmmac_xpcs_setup(struct mii_bus *bus)
{
struct net_device *ndev = bus->priv;
struct mdio_device *mdiodev;
+ bool skip_xpcs_soft_reset;
struct stmmac_priv *priv;
struct dw_xpcs *xpcs;
int mode, addr;
+ int err;
priv = netdev_priv(ndev);
mode = priv->plat->phy_interface;
+ skip_xpcs_soft_reset = priv->plat->skip_xpcs_soft_reset;
/* Try to probe the XPCS by scanning all addresses. */
for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
@@ -414,12 +417,21 @@ int stmmac_xpcs_setup(struct mii_bus *bus)
if (IS_ERR(mdiodev))
continue;
- xpcs = xpcs_create(mdiodev, mode);
+ xpcs = xpcs_create(mdiodev);
if (IS_ERR_OR_NULL(xpcs)) {
mdio_device_free(mdiodev);
continue;
}
+ if (!skip_xpcs_soft_reset) {
+ err = xpcs_reset(xpcs, mode);
+ if (err) {
+ xpcs_destroy(xpcs);
+ mdio_device_free(mdiodev);
+ continue;
+ }
+ }
+
priv->hw->xpcs = xpcs;
break;
}
diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index 63fda3fc40aa..2e721e57bee4 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -248,6 +248,18 @@ static int xpcs_soft_reset(struct dw_xpcs *xpcs,
return xpcs_poll_reset(xpcs, dev);
}
+int xpcs_reset(struct dw_xpcs *xpcs, phy_interface_t interface)
+{
+ const struct xpcs_compat *compat;
+
+ compat = xpcs_find_compat(xpcs->id, interface);
+ if (!compat)
+ return -ENODEV;
+
+ return xpcs_soft_reset(xpcs, compat);
+}
+EXPORT_SYMBOL_GPL(xpcs_reset);
+
#define xpcs_warn(__xpcs, __state, __args...) \
({ \
if ((__state)->link) \
@@ -1080,12 +1092,11 @@ static const struct phylink_pcs_ops xpcs_phylink_ops = {
.pcs_link_up = xpcs_link_up,
};
-struct dw_xpcs *xpcs_create(struct mdio_device *mdiodev,
- phy_interface_t interface)
+struct dw_xpcs *xpcs_create(struct mdio_device *mdiodev)
{
struct dw_xpcs *xpcs;
u32 xpcs_id;
- int i, ret;
+ int i;
xpcs = kzalloc(sizeof(*xpcs), GFP_KERNEL);
if (!xpcs)
@@ -1097,35 +1108,18 @@ struct dw_xpcs *xpcs_create(struct mdio_device *mdiodev,
for (i = 0; i < ARRAY_SIZE(xpcs_id_list); i++) {
const struct xpcs_id *entry = &xpcs_id_list[i];
- const struct xpcs_compat *compat;
if ((xpcs_id & entry->mask) != entry->id)
continue;
xpcs->id = entry;
-
- compat = xpcs_find_compat(entry, interface);
- if (!compat) {
- ret = -ENODEV;
- goto out;
- }
-
xpcs->pcs.ops = &xpcs_phylink_ops;
xpcs->pcs.poll = true;
- ret = xpcs_soft_reset(xpcs, compat);
- if (ret)
- goto out;
-
return xpcs;
}
- ret = -ENODEV;
-
-out:
- kfree(xpcs);
-
- return ERR_PTR(ret);
+ return ERR_PTR(-ENODEV);
}
EXPORT_SYMBOL_GPL(xpcs_create);
diff --git a/include/linux/pcs/pcs-xpcs.h b/include/linux/pcs/pcs-xpcs.h
index add077a81b21..d841f55f12cc 100644
--- a/include/linux/pcs/pcs-xpcs.h
+++ b/include/linux/pcs/pcs-xpcs.h
@@ -35,8 +35,8 @@ void xpcs_validate(struct dw_xpcs *xpcs, unsigned long *supported,
struct phylink_link_state *state);
int xpcs_config_eee(struct dw_xpcs *xpcs, int mult_fact_100ns,
int enable);
-struct dw_xpcs *xpcs_create(struct mdio_device *mdiodev,
- phy_interface_t interface);
+int xpcs_reset(struct dw_xpcs *xpcs, phy_interface_t interface);
+struct dw_xpcs *xpcs_create(struct mdio_device *mdiodev);
void xpcs_destroy(struct dw_xpcs *xpcs);
#endif /* __LINUX_PCS_XPCS_H */
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index a6f03b36fc4f..0f901773c5e4 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -268,5 +268,6 @@ struct plat_stmmacenet_data {
int msi_rx_base_vec;
int msi_tx_base_vec;
bool use_phy_wol;
+ bool skip_xpcs_soft_reset;
};
#endif
-----------------------------[ cut here ]-----------------------------
I also gave this patch a run on sja1105 and it still works.