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Date: Fri, 6 Nov 2020 08:43:24 -0500
From: Sven Van Asbroeck <thesven73@...il.com>
To: Andrew Lunn <andrew@...n.ch>,
Bryan Whitehead <bryan.whitehead@...rochip.com>,
David S Miller <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: Sven Van Asbroeck <thesven73@...il.com>,
Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
Roelof Berg <rberg@...g-solutions.de>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2] lan743x: correctly handle chips with internal PHY
From: Sven Van Asbroeck <thesven73@...il.com>
Commit 6f197fb63850 ("lan743x: Added fixed link and RGMII support")
assumes that chips with an internal PHY will never have a devicetree
entry. This is incorrect: even for these chips, a devicetree entry
can be useful e.g. to pass the mac address from bootloader to chip:
&pcie {
status = "okay";
host@0 {
reg = <0 0 0 0 0>;
#address-cells = <3>;
#size-cells = <2>;
lan7430: ethernet@0 {
/* LAN7430 with internal PHY */
compatible = "microchip,lan743x";
status = "okay";
reg = <0 0 0 0 0>;
/* filled in by bootloader */
local-mac-address = [00 00 00 00 00 00];
};
};
};
If a devicetree entry is present, the driver will not attach the chip
to its internal phy, and the chip will be non-operational.
Fix by tweaking the phy connection algorithm:
- first try to connect to a phy specified in the devicetree
(could be 'real' phy, or just a 'fixed-link')
- if that doesn't succeed, try to connect to an internal phy, even
if the chip has a devnode
Tested on a LAN7430 with internal PHY. I cannot test a device using
fixed-link, as I do not have access to one.
Fixes: 6f197fb63850 ("lan743x: Added fixed link and RGMII support")
Tested-by: Sven Van Asbroeck <thesven73@...il.com> # lan7430
Signed-off-by: Sven Van Asbroeck <thesven73@...il.com>
---
v1 -> v2:
Andrew Lunn: keep patch minimal and correct, so keep open-coded version
of of_phy_get_and_connect().
Jakub Kicinski: fix e-mail address case.
Tree: v5.10-rc2
To: Andrew Lunn <andrew@...n.ch>
To: Bryan Whitehead <bryan.whitehead@...rochip.com>
To: "David S. Miller" <davem@...emloft.net>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>
Cc: Roelof Berg <rberg@...g-solutions.de>
Cc: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
drivers/net/ethernet/microchip/lan743x_main.c | 21 +++++++++++--------
drivers/net/ethernet/microchip/lan743x_main.h | 1 -
2 files changed, 12 insertions(+), 10 deletions(-)
diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/ethernet/microchip/lan743x_main.c
index f2d13e8d20f0..65e80d41c9bc 100644
--- a/drivers/net/ethernet/microchip/lan743x_main.c
+++ b/drivers/net/ethernet/microchip/lan743x_main.c
@@ -957,7 +957,7 @@ static void lan743x_phy_link_status_change(struct net_device *netdev)
data = lan743x_csr_read(adapter, MAC_CR);
/* set interface mode */
- if (phy_interface_mode_is_rgmii(adapter->phy_mode))
+ if (phy_interface_is_rgmii(phydev))
/* RGMII */
data &= ~MAC_CR_MII_EN_;
else
@@ -1014,17 +1014,18 @@ static void lan743x_phy_close(struct lan743x_adapter *adapter)
static int lan743x_phy_open(struct lan743x_adapter *adapter)
{
struct lan743x_phy *phy = &adapter->phy;
+ struct phy_device *phydev = NULL;
struct device_node *phynode;
- struct phy_device *phydev;
struct net_device *netdev;
+ phy_interface_t phy_mode;
int ret = -EIO;
netdev = adapter->netdev;
phynode = of_node_get(adapter->pdev->dev.of_node);
- adapter->phy_mode = PHY_INTERFACE_MODE_GMII;
if (phynode) {
- of_get_phy_mode(phynode, &adapter->phy_mode);
+ /* try devicetree phy, or fixed link */
+ of_get_phy_mode(phynode, &phy_mode);
if (of_phy_is_fixed_link(phynode)) {
ret = of_phy_register_fixed_link(phynode);
@@ -1037,18 +1038,19 @@ static int lan743x_phy_open(struct lan743x_adapter *adapter)
}
phydev = of_phy_connect(netdev, phynode,
lan743x_phy_link_status_change, 0,
- adapter->phy_mode);
+ phy_mode);
of_node_put(phynode);
- if (!phydev)
- goto return_error;
- } else {
+ }
+
+ if (!phydev) {
+ /* try internal phy */
phydev = phy_find_first(adapter->mdiobus);
if (!phydev)
goto return_error;
ret = phy_connect_direct(netdev, phydev,
lan743x_phy_link_status_change,
- adapter->phy_mode);
+ PHY_INTERFACE_MODE_GMII);
if (ret)
goto return_error;
}
@@ -1063,6 +1065,7 @@ static int lan743x_phy_open(struct lan743x_adapter *adapter)
phy_start(phydev);
phy_start_aneg(phydev);
+ phy_attached_info(phydev);
return 0;
return_error:
diff --git a/drivers/net/ethernet/microchip/lan743x_main.h b/drivers/net/ethernet/microchip/lan743x_main.h
index a536f4a4994d..3a0e70daa88f 100644
--- a/drivers/net/ethernet/microchip/lan743x_main.h
+++ b/drivers/net/ethernet/microchip/lan743x_main.h
@@ -703,7 +703,6 @@ struct lan743x_rx {
struct lan743x_adapter {
struct net_device *netdev;
struct mii_bus *mdiobus;
- phy_interface_t phy_mode;
int msg_enable;
#ifdef CONFIG_PM
u32 wolopts;
--
2.17.1
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