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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@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ansuel Smith 2021-05-14 23:03:51 +02:00 committed by David S. Miller
parent b097bea102
commit 77091933e4
1 changed files with 9 additions and 2 deletions
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11
drivers/net/mdio/mdio-ipq8064.c
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@ -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);
}