From: Lukas Wunner <lukas@wunner.de>
To: Steve Glendinning <steve.glendinning@shawell.net>,
UNGLinuxDriver@microchip.com, Oliver Neukum <oneukum@suse.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>
Cc: netdev@vger.kernel.org, linux-usb@vger.kernel.org,
Andre Edich <andre.edich@microchip.com>,
Oleksij Rempel <o.rempel@pengutronix.de>,
Martyn Welch <martyn.welch@collabora.com>,
Gabriel Hojda <ghojda@yo2urs.ro>,
Christoph Fritz <chf.fritz@googlemail.com>,
Lino Sanfilippo <LinoSanfilippo@gmx.de>,
Philipp Rosenberger <p.rosenberger@kunbus.com>,
Heiner Kallweit <hkallweit1@gmail.com>,
Andrew Lunn <andrew@lunn.ch>,
Russell King <linux@armlinux.org.uk>
Subject: [PATCH net-next 3/7] usbnet: smsc95xx: Don't reset PHY behind PHY driver's back
Date: Wed, 27 Apr 2022 07:48:03 +0200 [thread overview]
Message-ID: <cf64096387a685596b3590452b899618d46de433.1651037513.git.lukas@wunner.de> (raw)
In-Reply-To: <cover.1651037513.git.lukas@wunner.de>
smsc95xx_reset() resets the PHY behind the PHY driver's back, which
seems like a bad idea generally. Remove that portion of the function.
We're about to use PHY interrupts instead of polling to detect link
changes on SMSC LAN95xx chips. Because smsc95xx_reset() is called from
usbnet_open(), PHY interrupt settings are lost whenever the net_device
is brought up.
There are two other callers of smsc95xx_reset(), namely smsc95xx_bind()
and smsc95xx_reset_resume(), and both may indeed benefit from a PHY
reset. However they already perform one through their calls to
phy_connect_direct() and phy_init_hw().
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Martyn Welch <martyn.welch@collabora.com>
Cc: Gabriel Hojda <ghojda@yo2urs.ro>
---
drivers/net/usb/smsc95xx.c | 18 ------------------
1 file changed, 18 deletions(-)
diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index 2cb44d65bbc3..6c37c7adde1b 100644
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -887,24 +887,6 @@ static int smsc95xx_reset(struct usbnet *dev)
return ret;
}
- ret = smsc95xx_write_reg(dev, PM_CTRL, PM_CTL_PHY_RST_);
- if (ret < 0)
- return ret;
-
- timeout = 0;
- do {
- msleep(10);
- ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
- if (ret < 0)
- return ret;
- timeout++;
- } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
-
- if (timeout >= 100) {
- netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
- return ret;
- }
-
ret = smsc95xx_set_mac_address(dev);
if (ret < 0)
return ret;
--
2.35.2
next prev parent reply other threads:[~2022-04-27 6:01 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-27 5:48 [PATCH net-next 0/7] Polling be gone on LAN95xx Lukas Wunner
2022-04-27 5:48 ` [PATCH net-next 1/7] usbnet: Run unregister_netdev() before unbind() again Lukas Wunner
2022-04-27 7:44 ` Oliver Neukum
2022-04-27 7:45 ` Oliver Neukum
2022-04-27 5:48 ` [PATCH net-next 2/7] usbnet: smsc95xx: Don't clear read-only PHY interrupt Lukas Wunner
2022-04-27 5:48 ` Lukas Wunner [this message]
2022-04-27 5:48 ` [PATCH net-next 4/7] usbnet: smsc95xx: Avoid link settings race on interrupt reception Lukas Wunner
2022-04-27 11:50 ` Andrew Lunn
2022-04-27 5:48 ` [PATCH net-next 5/7] usbnet: smsc95xx: Forward PHY interrupts to PHY driver to avoid polling Lukas Wunner
2022-04-27 12:03 ` Andrew Lunn
2022-04-27 12:26 ` Andrew Lunn
2022-04-27 5:48 ` [PATCH net-next 6/7] net: phy: smsc: Cache interrupt mask Lukas Wunner
2022-04-27 12:14 ` Andrew Lunn
2022-04-27 12:51 ` Lukas Wunner
2022-04-27 5:48 ` [PATCH net-next 7/7] net: phy: smsc: Cope with hot-removal in interrupt handler Lukas Wunner
2022-04-27 7:46 ` Oliver Neukum
2022-04-27 12:37 ` [PATCH net-next 0/7] Polling be gone on LAN95xx Oleksij Rempel
2022-04-28 12:19 ` Lukas Wunner
2022-05-02 20:33 ` Ferry Toth
2022-05-03 8:26 ` Lukas Wunner
2022-05-03 14:26 ` Ferry Toth
2022-05-04 8:15 ` Lukas Wunner
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