From: Ansuel Smith <ansuelsmth@gmail.com>
To: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ansuel Smith <ansuelsmth@gmail.com>, Andrew Lunn <andrew@lunn.ch>,
Vivien Didelot <vivien.didelot@gmail.com>,
Vladimir Oltean <olteanv@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Russell King <linux@armlinux.org.uk>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [RFC PATCH net-next v4 20/28] net: dsa: qca8k: clear MASTER_EN after phy read/write
Date: Sat, 8 May 2021 02:29:10 +0200 [thread overview]
Message-ID: <20210508002920.19945-20-ansuelsmth@gmail.com> (raw)
In-Reply-To: <20210508002920.19945-1-ansuelsmth@gmail.com>
Clear MDIO_MASTER_EN bit from MDIO_MASTER_CTRL after read/write
operation. The MDIO_MASTER_EN bit is not reset after read/write
operation and the next operation can be wrongly interpreted by the
switch as a mdio operation. This cause a production of wrong/garbage
data from the switch and underfined bheavior. (random port drop,
unplugged port flagged with link up, wrong port speed)
Also on driver remove the MASTER_CTRL can be left set and cause the
malfunction of any next driver using the mdio device.
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
---
drivers/net/dsa/qca8k.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index 0c53b6fdf6ee..2e0d2f918efe 100644
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -661,8 +661,14 @@ qca8k_mdio_write(struct qca8k_priv *priv, int port, u32 regnum, u16 data)
if (ret)
return ret;
- return qca8k_busy_wait(priv, QCA8K_MDIO_MASTER_CTRL,
- QCA8K_MDIO_MASTER_BUSY);
+ ret = qca8k_busy_wait(priv, QCA8K_MDIO_MASTER_CTRL,
+ QCA8K_MDIO_MASTER_BUSY);
+
+ /* even if the busy_wait timeouts try to clear the MASTER_EN */
+ qca8k_reg_clear(priv, QCA8K_MDIO_MASTER_CTRL,
+ QCA8K_MDIO_MASTER_EN);
+
+ return ret;
}
static int
@@ -697,6 +703,10 @@ qca8k_mdio_read(struct qca8k_priv *priv, int port, u32 regnum)
val &= QCA8K_MDIO_MASTER_DATA_MASK;
+ /* even if the busy_wait timeouts try to clear the MASTER_EN */
+ qca8k_reg_clear(priv, QCA8K_MDIO_MASTER_CTRL,
+ QCA8K_MDIO_MASTER_EN);
+
return val;
}
--
2.30.2
next prev parent reply other threads:[~2021-05-08 0:31 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-08 0:28 [RFC PATCH net-next v4 01/28] net: mdio: ipq8064: clean whitespaces in define Ansuel Smith
2021-05-08 0:28 ` [RFC PATCH net-next v4 02/28] net: mdio: ipq8064: add regmap config to disable REGCACHE Ansuel Smith
2021-05-08 15:46 ` Florian Fainelli
2021-05-08 0:28 ` [RFC PATCH net-next v4 03/28] net: mdio: ipq8064: enlarge sleep after read/write operation Ansuel Smith
2021-05-08 15:53 ` Florian Fainelli
2021-05-08 0:28 ` [RFC PATCH net-next v4 04/28] net: dsa: qca8k: change simple print to dev variant Ansuel Smith
2021-05-08 15:47 ` Florian Fainelli
2021-05-08 0:28 ` [RFC PATCH net-next v4 05/28] net: dsa: qca8k: use iopoll macro for qca8k_busy_wait Ansuel Smith
2021-05-08 17:38 ` Andrew Lunn
2021-05-08 0:28 ` [RFC PATCH net-next v4 06/28] net: dsa: qca8k: improve qca8k read/write/rmw bus access Ansuel Smith
2021-05-08 17:39 ` Andrew Lunn
2021-05-08 0:28 ` [RFC PATCH net-next v4 07/28] net: dsa: qca8k: handle qca8k_set_page errors Ansuel Smith
2021-05-08 17:40 ` Andrew Lunn
2021-05-08 0:28 ` [RFC PATCH net-next v4 08/28] net: dsa: qca8k: handle error with qca8k_read operation Ansuel Smith
2021-05-08 17:46 ` Andrew Lunn
2021-05-08 0:28 ` [RFC PATCH net-next v4 09/28] net: dsa: qca8k: handle error with qca8k_write operation Ansuel Smith
2021-05-08 17:47 ` Andrew Lunn
2021-05-08 0:29 ` [RFC PATCH net-next v4 10/28] net: dsa: qca8k: handle error with qca8k_rmw operation Ansuel Smith
2021-05-08 17:59 ` Andrew Lunn
2021-05-08 0:29 ` [RFC PATCH net-next v4 11/28] net: dsa: qca8k: handle error from qca8k_busy_wait Ansuel Smith
2021-05-08 17:59 ` Andrew Lunn
2021-05-08 0:29 ` [RFC PATCH net-next v4 12/28] net: dsa: qca8k: add support for qca8327 switch Ansuel Smith
2021-05-08 15:47 ` Florian Fainelli
2021-05-08 0:29 ` [RFC PATCH net-next v4 13/28] devicetree: net: dsa: qca8k: Document new compatible qca8327 Ansuel Smith
2021-05-08 15:47 ` Florian Fainelli
2021-05-08 0:29 ` [RFC PATCH net-next v4 14/28] net: dsa: qca8k: add priority tweak to qca8337 switch Ansuel Smith
2021-05-08 0:29 ` [RFC PATCH net-next v4 15/28] net: dsa: qca8k: limit port5 delay to qca8337 Ansuel Smith
2021-05-08 0:29 ` [RFC PATCH net-next v4 16/28] net: dsa: qca8k: add GLOBAL_FC settings needed for qca8327 Ansuel Smith
2021-05-08 0:29 ` [RFC PATCH net-next v4 17/28] net: dsa: qca8k: add support for switch rev Ansuel Smith
2021-05-08 15:48 ` Florian Fainelli
2021-05-08 0:29 ` [RFC PATCH net-next v4 18/28] net: dsa: qca8k: add ethernet-ports fallback to setup_mdio_bus Ansuel Smith
2021-05-08 18:07 ` Andrew Lunn
2021-05-08 0:29 ` [RFC PATCH net-next v4 19/28] net: dsa: qca8k: make rgmii delay configurable Ansuel Smith
2021-05-08 18:12 ` Andrew Lunn
2021-05-08 23:58 ` Ansuel Smith
2021-05-09 1:07 ` Andrew Lunn
2021-05-09 1:17 ` Ansuel Smith
2021-05-09 1:27 ` Andrew Lunn
2021-05-08 0:29 ` Ansuel Smith [this message]
2021-05-08 0:29 ` [RFC PATCH net-next v4 21/28] net: dsa: qca8k: dsa: qca8k: protect MASTER busy_wait with mdio mutex Ansuel Smith
2021-05-08 0:29 ` [RFC PATCH net-next v4 22/28] net: dsa: qca8k: enlarge mdio delay and timeout Ansuel Smith
2021-05-08 0:29 ` [RFC PATCH net-next v4 23/28] net: dsa: register of_mdiobus if a mdio node is declared Ansuel Smith
2021-05-08 4:36 ` Florian Fainelli
2021-05-08 0:29 ` [RFC PATCH net-next v4 24/28] devicetree: net: dsa: Document use of mdio node inside switch node Ansuel Smith
2021-05-10 14:01 ` Rob Herring
2021-05-08 0:29 ` [RFC PATCH net-next v4 25/28] net: dsa: qca8k: add support for internal phy Ansuel Smith
2021-05-08 0:29 ` [RFC PATCH net-next v4 26/28] net: dsa: permit driver to provide custom phy_mii_mask for slave mdiobus Ansuel Smith
2021-05-08 15:52 ` Florian Fainelli
2021-05-08 16:29 ` Ansuel Smith
2021-05-08 0:29 ` [RFC PATCH net-next v4 27/28] net: dsa: qca8k: pass switch_revision info to phy dev_flags Ansuel Smith
2021-05-08 15:49 ` Florian Fainelli
2021-05-08 0:29 ` [RFC PATCH net-next v4 28/28] net: phy: add qca8k driver for qca8k switch internal PHY Ansuel Smith
2021-05-08 4:35 ` DENG Qingfang
2021-05-08 11:30 ` Ansuel Smith
2021-05-08 15:45 ` Florian Fainelli
2021-05-08 15:45 ` [RFC PATCH net-next v4 01/28] net: mdio: ipq8064: clean whitespaces in define Florian Fainelli
2021-05-08 15:57 ` Joe Perches
2021-05-08 18:02 ` Andrew Lunn
2021-05-08 18:05 ` Ansuel Smith
2021-05-15 17:00 ` Jonathan McDowell
2021-05-15 17:03 ` Florian Fainelli
2021-05-15 17:30 ` Ansuel Smith
2021-05-15 18:08 ` Jonathan McDowell
2021-05-15 18:20 ` Ansuel Smith
2021-05-15 19:40 ` Jonathan McDowell
2021-05-15 19:47 ` Ansuel Smith
2021-05-15 23:52 ` Andrew Lunn
2021-05-16 0:23 ` Ansuel Smith
2021-05-16 9:37 ` Jonathan McDowell
2021-05-16 9:49 ` Jonathan McDowell
2021-05-16 10:12 ` Jonathan McDowell
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