From: Ansuel Smith <ansuelsmth@gmail.com>
To: Andrew Lunn <andrew@lunn.ch>,
Heiner Kallweit <hkallweit1@gmail.com>,
Russell King <linux@armlinux.org.uk>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Ansuel Smith <ansuelsmth@gmail.com>,
Florian Fainelli <f.fainelli@gmail.com>
Subject: [net-next 3/3] net: mdio: ipq8064: enlarge sleep after read/write operation
Date: Fri, 14 May 2021 23:03:51 +0200 [thread overview]
Message-ID: <20210514210351.22240-3-ansuelsmth@gmail.com> (raw)
In-Reply-To: <20210514210351.22240-1-ansuelsmth@gmail.com>
With the use of the qca8k dsa driver, some problem arised related to
port status detection. With a load on a specific port (for example a
simple speed test), the driver starts to behave in a strange way and
garbage data is produced. To address this, enlarge the sleep delay and
address a bug for the reg offset 31 that require additional delay for
this specific reg.
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
---
drivers/net/mdio/mdio-ipq8064.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/net/mdio/mdio-ipq8064.c b/drivers/net/mdio/mdio-ipq8064.c
index 14b3c310af73..bd1aea2d5a26 100644
--- a/drivers/net/mdio/mdio-ipq8064.c
+++ b/drivers/net/mdio/mdio-ipq8064.c
@@ -65,7 +65,7 @@ ipq8064_mdio_read(struct mii_bus *bus, int phy_addr, int reg_offset)
((reg_offset << MII_REG_SHIFT) & MII_REG_MASK);
regmap_write(priv->base, MII_ADDR_REG_ADDR, miiaddr);
- usleep_range(8, 10);
+ usleep_range(10, 13);
err = ipq8064_mdio_wait_busy(priv);
if (err)
@@ -91,7 +91,14 @@ ipq8064_mdio_write(struct mii_bus *bus, int phy_addr, int reg_offset, u16 data)
((reg_offset << MII_REG_SHIFT) & MII_REG_MASK);
regmap_write(priv->base, MII_ADDR_REG_ADDR, miiaddr);
- usleep_range(8, 10);
+
+ /* For the specific reg 31 extra time is needed or the next
+ * read will produce garbage data.
+ */
+ if (reg_offset == 31)
+ usleep_range(30, 43);
+ else
+ usleep_range(10, 13);
return ipq8064_mdio_wait_busy(priv);
}
--
2.30.2
next prev parent reply other threads:[~2021-05-14 21:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-14 21:03 [net-next 1/3] net: mdio: ipq8064: clean whitespaces in define Ansuel Smith
2021-05-14 21:03 ` [net-next 2/3] net: mdio: ipq8064: add regmap config to disable REGCACHE Ansuel Smith
2021-05-14 21:03 ` Ansuel Smith [this message]
2021-05-14 22:40 ` [net-next 1/3] net: mdio: ipq8064: clean whitespaces in define patchwork-bot+netdevbpf
2021-05-14 23:01 ` Florian Fainelli
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