diff mbox series

[v3,net] net:usb:lan78xx: fix accessing the LAN7800's internal phy specific registers from the MAC driver

Message ID 20230301154307.30438-1-yuiko.oshino@microchip.com
State New
Headers show
Series [v3,net] net:usb:lan78xx: fix accessing the LAN7800's internal phy specific registers from the MAC driver | expand

Commit Message

Yuiko Oshino March 1, 2023, 3:43 p.m. UTC 
Move the LAN7800 internal phy (phy ID  0x0007c132) specific register
accesses to the phy driver (microchip.c).

Fix the error reported by Enguerrand de Ribaucourt in December 2022,
"Some operations during the cable switch workaround modify the register
LAN88XX_INT_MASK of the PHY. However, this register is specific to the
LAN8835 PHY. For instance, if a DP8322I PHY is connected to the LAN7801,
that register (0x19), corresponds to the LED and MAC address
configuration, resulting in unapropriate behavior."

I did not test with the DP8322I PHY, but I tested with an EVB-LAN7800
with the internal PHY.

Fixes: 14437e3fa284 ("lan78xx: workaround of forced 100 Full/Half duplex mode error")
Signed-off-by: Yuiko Oshino <yuiko.oshino@microchip.com>

v2->v3:
    - Change the commit message lines to less than 80 characters.
    - Change the Fixes: tag to 12 byte long.
v1->v2: 
    - Add an error behavior comment reported by Enguerrand.
    - Create a single patch instead of a series.
---
 drivers/net/phy/microchip.c | 32 ++++++++++++++++++++++++++++++++
 drivers/net/usb/lan78xx.c   | 27 +--------------------------
 2 files changed, 33 insertions(+), 26 deletions(-)

Comments

patchwork-bot+netdevbpf@kernel.org March 3, 2023, 6:30 a.m. UTC | #1 
Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Wed, 1 Mar 2023 08:43:07 -0700 you wrote:
> Move the LAN7800 internal phy (phy ID  0x0007c132) specific register
> accesses to the phy driver (microchip.c).
> 
> Fix the error reported by Enguerrand de Ribaucourt in December 2022,
> "Some operations during the cable switch workaround modify the register
> LAN88XX_INT_MASK of the PHY. However, this register is specific to the
> LAN8835 PHY. For instance, if a DP8322I PHY is connected to the LAN7801,
> that register (0x19), corresponds to the LED and MAC address
> configuration, resulting in unapropriate behavior."
> 
> [...]

Here is the summary with links:
  - [v3,net] net:usb:lan78xx: fix accessing the LAN7800's internal phy specific registers from the MAC driver
    https://git.kernel.org/netdev/net/c/e57cf3639c32

You are awesome, thank you!
diff mbox series

Patch

diff --git a/drivers/net/phy/microchip.c b/drivers/net/phy/microchip.c
index ccecee2524ce..0b88635f4fbc 100644
--- a/drivers/net/phy/microchip.c
+++ b/drivers/net/phy/microchip.c
@@ -342,6 +342,37 @@  static int lan88xx_config_aneg(struct phy_device *phydev)
 	return genphy_config_aneg(phydev);
 }
 
+static void lan88xx_link_change_notify(struct phy_device *phydev)
+{
+	int temp;
+
+	/* At forced 100 F/H mode, chip may fail to set mode correctly
+	 * when cable is switched between long(~50+m) and short one.
+	 * As workaround, set to 10 before setting to 100
+	 * at forced 100 F/H mode.
+	 */
+	if (!phydev->autoneg && phydev->speed == 100) {
+		/* disable phy interrupt */
+		temp = phy_read(phydev, LAN88XX_INT_MASK);
+		temp &= ~LAN88XX_INT_MASK_MDINTPIN_EN_;
+		phy_write(phydev, LAN88XX_INT_MASK, temp);
+
+		temp = phy_read(phydev, MII_BMCR);
+		temp &= ~(BMCR_SPEED100 | BMCR_SPEED1000);
+		phy_write(phydev, MII_BMCR, temp); /* set to 10 first */
+		temp |= BMCR_SPEED100;
+		phy_write(phydev, MII_BMCR, temp); /* set to 100 later */
+
+		/* clear pending interrupt generated while workaround */
+		temp = phy_read(phydev, LAN88XX_INT_STS);
+
+		/* enable phy interrupt back */
+		temp = phy_read(phydev, LAN88XX_INT_MASK);
+		temp |= LAN88XX_INT_MASK_MDINTPIN_EN_;
+		phy_write(phydev, LAN88XX_INT_MASK, temp);
+	}
+}
+
 static struct phy_driver microchip_phy_driver[] = {
 {
 	.phy_id		= 0x0007c132,
@@ -359,6 +390,7 @@  static struct phy_driver microchip_phy_driver[] = {
 
 	.config_init	= lan88xx_config_init,
 	.config_aneg	= lan88xx_config_aneg,
+	.link_change_notify = lan88xx_link_change_notify,
 
 	.config_intr	= lan88xx_phy_config_intr,
 	.handle_interrupt = lan88xx_handle_interrupt,
diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index f18ab8e220db..068488890d57 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -2115,33 +2115,8 @@  static void lan78xx_remove_mdio(struct lan78xx_net *dev)
 static void lan78xx_link_status_change(struct net_device *net)
 {
 	struct phy_device *phydev = net->phydev;
-	int temp;
-
-	/* At forced 100 F/H mode, chip may fail to set mode correctly
-	 * when cable is switched between long(~50+m) and short one.
-	 * As workaround, set to 10 before setting to 100
-	 * at forced 100 F/H mode.
-	 */
-	if (!phydev->autoneg && (phydev->speed == 100)) {
-		/* disable phy interrupt */
-		temp = phy_read(phydev, LAN88XX_INT_MASK);
-		temp &= ~LAN88XX_INT_MASK_MDINTPIN_EN_;
-		phy_write(phydev, LAN88XX_INT_MASK, temp);
 
-		temp = phy_read(phydev, MII_BMCR);
-		temp &= ~(BMCR_SPEED100 | BMCR_SPEED1000);
-		phy_write(phydev, MII_BMCR, temp); /* set to 10 first */
-		temp |= BMCR_SPEED100;
-		phy_write(phydev, MII_BMCR, temp); /* set to 100 later */
-
-		/* clear pending interrupt generated while workaround */
-		temp = phy_read(phydev, LAN88XX_INT_STS);
-
-		/* enable phy interrupt back */
-		temp = phy_read(phydev, LAN88XX_INT_MASK);
-		temp |= LAN88XX_INT_MASK_MDINTPIN_EN_;
-		phy_write(phydev, LAN88XX_INT_MASK, temp);
-	}
+	phy_print_status(phydev);
 }
 
 static int irq_map(struct irq_domain *d, unsigned int irq,