[PATCH 0/2 (linux-stable-4.5.y)] net: stmmac: MDIO fixes

[PATCH 0/2 (linux-stable-4.5.y)] net: stmmac: MDIO fixes

[Giuseppe Cavallaro]

These patches port some recent fixes for linux-4.5.y stable branch.
They fix the MDIO settings trying to cover the all possible scenario
when the stmmac is connected to a real transceiver or a switch.

These patches are needed for Kernel 4.5 where Lime2, BananaPi and Cubieboard2
show problems when use the stmmac:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=823493

Additional Note:

 o The 4.4.y branch has a previous version of the stmmac;
   that is not including the development that introduced
   the regressions for MDIO bus.

 o The 4.5.y kernel has "March_2013" stmmac version plus the
   patch that introduce some MDIO configuration problems
   so the regressions.

 o The 4.6.y has all the fixes on top of the "Oct_2015"
   stmmac version.

Giuseppe CAVALLARO (1):
  Revert "stmmac: Fix 'eth0: No PHY found' regression"

Giuseppe Cavallaro (1):
  stmmac: fix MDIO settings

 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  | 11 +--
 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c  | 10 +--
 .../net/ethernet/stmicro/stmmac/stmmac_platform.c  | 91 ++++++++++++++++------
 3 files changed, 70 insertions(+), 42 deletions(-)

-- 
2.7.4

[PATCH 1/2 (linux-stable-4.5.y)] Revert "stmmac: Fix 'eth0: No PHY found' regression"

[Giuseppe Cavallaro]

From: Giuseppe CAVALLARO <peppe.cavallaro-qxv4g6HH51o@public.gmane.org>

This reverts commit 88f8b1bb41c6208f81b6a480244533ded7b59493.
due to problems on GeekBox and Banana Pi M1 board when
connected to a real transceiver instead of a switch via
fixed-link.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro-qxv4g6HH51o@public.gmane.org>
Cc: Gabriel Fernandez <gabriel.fernandez-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: Andreas Färber <afaerber-l3A5Bk7waGM@public.gmane.org>
Cc: Frank Schäfer <fschaefer.oss-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
Cc: Dinh Nguyen <dinh.linux-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: David S. Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
Signed-off-by: David S. Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c     | 11 ++++++++++-
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c |  9 +--------
 2 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index efb54f3..0faf163 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -199,12 +199,21 @@ int stmmac_mdio_register(struct net_device *ndev)
 	struct stmmac_priv *priv = netdev_priv(ndev);
 	struct stmmac_mdio_bus_data *mdio_bus_data = priv->plat->mdio_bus_data;
 	int addr, found;
-	struct device_node *mdio_node = priv->plat->mdio_node;
+	struct device_node *mdio_node = NULL;
+	struct device_node *child_node = NULL;
 
 	if (!mdio_bus_data)
 		return 0;
 
 	if (IS_ENABLED(CONFIG_OF)) {
+		for_each_child_of_node(priv->device->of_node, child_node) {
+			if (of_device_is_compatible(child_node,
+						    "snps,dwmac-mdio")) {
+				mdio_node = child_node;
+				break;
+			}
+		}
+
 		if (mdio_node) {
 			netdev_dbg(ndev, "FOUND MDIO subnode\n");
 		} else {
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 4514ba7..6a52fa1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -110,7 +110,6 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
 	struct device_node *np = pdev->dev.of_node;
 	struct plat_stmmacenet_data *plat;
 	struct stmmac_dma_cfg *dma_cfg;
-	struct device_node *child_node = NULL;
 
 	plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
 	if (!plat)
@@ -141,19 +140,13 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
 		plat->phy_node = of_node_get(np);
 	}
 
-	for_each_child_of_node(np, child_node)
-		if (of_device_is_compatible(child_node,	"snps,dwmac-mdio")) {
-			plat->mdio_node = child_node;
-			break;
-		}
-
 	/* "snps,phy-addr" is not a standard property. Mark it as deprecated
 	 * and warn of its use. Remove this when phy node support is added.
 	 */
 	if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
 		dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
 
-	if ((plat->phy_node && !of_phy_is_fixed_link(np)) || !plat->mdio_node)
+	if ((plat->phy_node && !of_phy_is_fixed_link(np)) || plat->phy_bus_name)
 		plat->mdio_bus_data = NULL;
 	else
 		plat->mdio_bus_data =
-- 
2.7.4

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[PATCH 2/2 (linux-stable-4.5.y)] stmmac: fix MDIO settings

[Giuseppe Cavallaro]

Initially the phy_bus_name was added to manipulate the
driver name but it was recently just used to manage the
fixed-link and then to take some decision at run-time.
So the patch uses the is_pseudo_fixed_link and removes
the phy_bus_name variable not necessary anymore.

The driver can manage the mdio registration by using phy-handle,
dwmac-mdio and own parameter e.g. snps,phy-addr.
This patch takes care about all these possible configurations
and fixes the mdio registration in case of there is a real
transceiver or a switch (that needs to be managed by using
fixed-link).

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro-qxv4g6HH51o@public.gmane.org>
Reviewed-by: Andreas Färber <afaerber-l3A5Bk7waGM@public.gmane.org>
Tested-by: Frank Schäfer <fschaefer.oss-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
Cc: Gabriel Fernandez <gabriel.fernandez-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: Dinh Nguyen <dinh.linux-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: David S. Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
Cc: Phil Reid <preid-qgqNFa1JUf/o2iN0hyhwsIdd74u8MsAO@public.gmane.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  | 11 +--
 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c  | 19 +----
 .../net/ethernet/stmicro/stmmac/stmmac_platform.c  | 84 +++++++++++++++++-----
 3 files changed, 70 insertions(+), 44 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index c21015b..389d7d0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -271,7 +271,6 @@ static void stmmac_eee_ctrl_timer(unsigned long arg)
  */
 bool stmmac_eee_init(struct stmmac_priv *priv)
 {
-	char *phy_bus_name = priv->plat->phy_bus_name;
 	unsigned long flags;
 	bool ret = false;
 
@@ -283,7 +282,7 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
 		goto out;
 
 	/* Never init EEE in case of a switch is attached */
-	if (phy_bus_name && (!strcmp(phy_bus_name, "fixed")))
+	if (priv->phydev->is_pseudo_fixed_link)
 		goto out;
 
 	/* MAC core supports the EEE feature. */
@@ -820,12 +819,8 @@ static int stmmac_init_phy(struct net_device *dev)
 		phydev = of_phy_connect(dev, priv->plat->phy_node,
 					&stmmac_adjust_link, 0, interface);
 	} else {
-		if (priv->plat->phy_bus_name)
-			snprintf(bus_id, MII_BUS_ID_SIZE, "%s-%x",
-				 priv->plat->phy_bus_name, priv->plat->bus_id);
-		else
-			snprintf(bus_id, MII_BUS_ID_SIZE, "stmmac-%x",
-				 priv->plat->bus_id);
+		snprintf(bus_id, MII_BUS_ID_SIZE, "stmmac-%x",
+			 priv->plat->bus_id);
 
 		snprintf(phy_id_fmt, MII_BUS_ID_SIZE + 3, PHY_ID_FMT, bus_id,
 			 priv->plat->phy_addr);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index 0faf163..3f5512f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -198,29 +198,12 @@ int stmmac_mdio_register(struct net_device *ndev)
 	struct mii_bus *new_bus;
 	struct stmmac_priv *priv = netdev_priv(ndev);
 	struct stmmac_mdio_bus_data *mdio_bus_data = priv->plat->mdio_bus_data;
+	struct device_node *mdio_node = priv->plat->mdio_node;
 	int addr, found;
-	struct device_node *mdio_node = NULL;
-	struct device_node *child_node = NULL;
 
 	if (!mdio_bus_data)
 		return 0;
 
-	if (IS_ENABLED(CONFIG_OF)) {
-		for_each_child_of_node(priv->device->of_node, child_node) {
-			if (of_device_is_compatible(child_node,
-						    "snps,dwmac-mdio")) {
-				mdio_node = child_node;
-				break;
-			}
-		}
-
-		if (mdio_node) {
-			netdev_dbg(ndev, "FOUND MDIO subnode\n");
-		} else {
-			netdev_warn(ndev, "No MDIO subnode found\n");
-		}
-	}
-
 	new_bus = mdiobus_alloc();
 	if (new_bus == NULL)
 		return -ENOMEM;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 6a52fa1..190fb6d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -96,6 +96,69 @@ static int dwmac1000_validate_ucast_entries(int ucast_entries)
 }
 
 /**
+ * stmmac_dt_phy - parse device-tree driver parameters to allocate PHY resources
+ * @plat: driver data platform structure
+ * @np: device tree node
+ * @dev: device pointer
+ * Description:
+ * The mdio bus will be allocated in case of a phy transceiver is on board;
+ * it will be NULL if the fixed-link is configured.
+ * If there is the "snps,dwmac-mdio" sub-node the mdio will be allocated
+ * in any case (for DSA, mdio must be registered even if fixed-link).
+ * The table below sums the supported configurations:
+ *	-------------------------------
+ *	snps,phy-addr	|     Y
+ *	-------------------------------
+ *	phy-handle	|     Y
+ *	-------------------------------
+ *	fixed-link	|     N
+ *	-------------------------------
+ *	snps,dwmac-mdio	|
+ *	  even if	|     Y
+ *	fixed-link	|
+ *	-------------------------------
+ *
+ * It returns 0 in case of success otherwise -ENODEV.
+ */
+static int stmmac_dt_phy(struct plat_stmmacenet_data *plat,
+			 struct device_node *np, struct device *dev)
+{
+	bool mdio = true;
+
+	/* If phy-handle property is passed from DT, use it as the PHY */
+	plat->phy_node = of_parse_phandle(np, "phy-handle", 0);
+	if (plat->phy_node)
+		dev_dbg(dev, "Found phy-handle subnode\n");
+
+	/* If phy-handle is not specified, check if we have a fixed-phy */
+	if (!plat->phy_node && of_phy_is_fixed_link(np)) {
+		if ((of_phy_register_fixed_link(np) < 0))
+			return -ENODEV;
+
+		dev_dbg(dev, "Found fixed-link subnode\n");
+		plat->phy_node = of_node_get(np);
+		mdio = false;
+	}
+
+	/* If snps,dwmac-mdio is passed from DT, always register the MDIO */
+	for_each_child_of_node(np, plat->mdio_node) {
+		if (of_device_is_compatible(plat->mdio_node, "snps,dwmac-mdio"))
+			break;
+	}
+
+	if (plat->mdio_node) {
+		dev_dbg(dev, "Found MDIO subnode\n");
+		mdio = true;
+	}
+
+	if (mdio)
+		plat->mdio_bus_data =
+			devm_kzalloc(dev, sizeof(struct stmmac_mdio_bus_data),
+				     GFP_KERNEL);
+	return 0;
+}
+
+/**
  * stmmac_probe_config_dt - parse device-tree driver parameters
  * @pdev: platform_device structure
  * @plat: driver data platform structure
@@ -129,30 +192,15 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
 	/* Default to phy auto-detection */
 	plat->phy_addr = -1;
 
-	/* If we find a phy-handle property, use it as the PHY */
-	plat->phy_node = of_parse_phandle(np, "phy-handle", 0);
-
-	/* If phy-handle is not specified, check if we have a fixed-phy */
-	if (!plat->phy_node && of_phy_is_fixed_link(np)) {
-		if ((of_phy_register_fixed_link(np) < 0))
-			return ERR_PTR(-ENODEV);
-
-		plat->phy_node = of_node_get(np);
-	}
-
 	/* "snps,phy-addr" is not a standard property. Mark it as deprecated
 	 * and warn of its use. Remove this when phy node support is added.
 	 */
 	if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
 		dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
 
-	if ((plat->phy_node && !of_phy_is_fixed_link(np)) || plat->phy_bus_name)
-		plat->mdio_bus_data = NULL;
-	else
-		plat->mdio_bus_data =
-			devm_kzalloc(&pdev->dev,
-				     sizeof(struct stmmac_mdio_bus_data),
-				     GFP_KERNEL);
+	/* To Configure PHY by using all device-tree supported properties */
+	if (stmmac_dt_phy(plat, np, &pdev->dev))
+		return ERR_PTR(-ENODEV);
 
 	of_property_read_u32(np, "tx-fifo-depth", &plat->tx_fifo_size);
 
-- 
2.7.4

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Re: [PATCH 0/2 (linux-stable-4.5.y)] net: stmmac: MDIO fixes

[Greg KH]

On Mon, May 23, 2016 at 03:17:41PM +0200, Giuseppe Cavallaro wrote:
> These patches port some recent fixes for linux-4.5.y stable branch.
> They fix the MDIO settings trying to cover the all possible scenario
> when the stmmac is connected to a real transceiver or a switch.
> 
> These patches are needed for Kernel 4.5 where Lime2, BananaPi and Cubieboard2
> show problems when use the stmmac:
> 
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=823493

What are the git commit id for these patches in Linus's tree?

thanks,

greg k-h

Re: [PATCH 0/2 (linux-stable-4.5.y)] net: stmmac: MDIO fixes

[Giuseppe CAVALLARO]

On 5/23/2016 5:36 PM, Greg KH wrote:
> On Mon, May 23, 2016 at 03:17:41PM +0200, Giuseppe Cavallaro wrote:
>> These patches port some recent fixes for linux-4.5.y stable branch.
>> They fix the MDIO settings trying to cover the all possible scenario
>> when the stmmac is connected to a real transceiver or a switch.
>>
>> These patches are needed for Kernel 4.5 where Lime2, BananaPi and Cubieboard2
>> show problems when use the stmmac:
>>
>> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=823493
>
> What are the git commit id for these patches in Linus's tree?

Commits are:

stmmac: fix MDIO settings

    a7657f128c279ae5796ab2ca7d04a7819f4259f0

and

Revert "stmmac: Fix 'eth0: No PHY found' regression"

    d7e944c8ddc0983640a9a32868fb217485d12ca2

Regards
Peppe

>
> thanks,
>
> greg k-h
>
>

Re: [PATCH 1/2 (linux-stable-4.5.y)] Revert "stmmac: Fix 'eth0: No PHY found' regression"

[Greg KH]

On Mon, May 23, 2016 at 03:17:42PM +0200, Giuseppe Cavallaro wrote:
> From: Giuseppe CAVALLARO <peppe.cavallaro-qxv4g6HH51o@public.gmane.org>
> 
> This reverts commit 88f8b1bb41c6208f81b6a480244533ded7b59493.
> due to problems on GeekBox and Banana Pi M1 board when
> connected to a real transceiver instead of a switch via
> fixed-link.
> 
> Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro-qxv4g6HH51o@public.gmane.org>
> Cc: Gabriel Fernandez <gabriel.fernandez-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> Cc: Andreas Färber <afaerber-l3A5Bk7waGM@public.gmane.org>
> Cc: Frank Schäfer <fschaefer.oss-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
> Cc: Dinh Nguyen <dinh.linux-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Cc: David S. Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
> Signed-off-by: David S. Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c     | 11 ++++++++++-
>  drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c |  9 +--------
>  2 files changed, 11 insertions(+), 9 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>

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Re: [PATCH 2/2 (linux-stable-4.5.y)] stmmac: fix MDIO settings

[Greg KH]

On Mon, May 23, 2016 at 03:17:43PM +0200, Giuseppe Cavallaro wrote:
> Initially the phy_bus_name was added to manipulate the
> driver name but it was recently just used to manage the
> fixed-link and then to take some decision at run-time.
> So the patch uses the is_pseudo_fixed_link and removes
> the phy_bus_name variable not necessary anymore.
> 
> The driver can manage the mdio registration by using phy-handle,
> dwmac-mdio and own parameter e.g. snps,phy-addr.
> This patch takes care about all these possible configurations
> and fixes the mdio registration in case of there is a real
> transceiver or a switch (that needs to be managed by using
> fixed-link).
> 
> Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
> Reviewed-by: Andreas Färber <afaerber@suse.de>
> Tested-by: Frank Schäfer <fschaefer.oss@googlemail.com>
> Cc: Gabriel Fernandez <gabriel.fernandez@linaro.org>
> Cc: Dinh Nguyen <dinh.linux@gmail.com>
> Cc: David S. Miller <davem@davemloft.net>
> Cc: Phil Reid <preid@electromag.com.au>
> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  | 11 +--
>  drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c  | 19 +----
>  .../net/ethernet/stmicro/stmmac/stmmac_platform.c  | 84 +++++++++++++++++-----
>  3 files changed, 70 insertions(+), 44 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>