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Date: Mon, 3 May 2021 01:06:55 +0200 From: Ansuel Smith <ansuelsmth@...il.com> To: Florian Fainelli <f.fainelli@...il.com> Cc: Ansuel Smith <ansuelsmth@...il.com>, Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [RFC PATCH net-next v2 03/17] net: mdio: ipq8064: enlarge sleep after read/write operation 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@...il.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 8ae5379eda9d..bba2fb0d6af8 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); writel(miiaddr, priv->base + MII_ADDR_REG_ADDR); - usleep_range(8, 10); + usleep_range(10, 13); err = ipq8064_mdio_wait_busy(priv); if (err) @@ -90,7 +90,14 @@ ipq8064_mdio_write(struct mii_bus *bus, int phy_addr, int reg_offset, u16 data) ((reg_offset << MII_REG_SHIFT) & MII_REG_MASK); writel(miiaddr, priv->base + MII_ADDR_REG_ADDR); - 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
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