net: ethernet: adi: adin1110: Reduce the MDIO_TRDONE poll interval

In order to do a clause 22 access to the PHY registers of the ADIN1110,
we have to write the MDIO frame to the ADIN1110_MDIOACC register, and
then poll the MDIO_TRDONE bit (for a 1) in the same register. The
device will set this bit to 1 once the internal MDIO transaction is
done. In practice, this bit takes ~50 - 60 us to be set.

The first attempt to poll the bit is right after the ADIN1110_MDIOACC
register is written, so it will always be read as 0. The next check will
only be done after 10 ms, which will result in the MDIO transactions
taking a long time to complete. Reduce this polling interval to 100 us.
Since this interval is short enough, switch the poll function to
readx_poll_timeout_atomic() instead.

Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: Ciprian Regus <ciprian.regus@analog.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20240223162129.154114-1-ciprian.regus@analog.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/ethernet/adi/adin1110.c b/drivers/net/ethernet/adi/adin1110.c
index d7c274a..8b4ef51 100644 (file)
--- a/drivers/net/ethernet/adi/adin1110.c
+++ b/drivers/net/ethernet/adi/adin1110.c
@@ -464,8 +464,9 @@ static int adin1110_mdio_read(struct mii_bus *bus, int phy_id, int reg)
         * bitfield of ADIN1110_MDIOACC register will contain
         * the requested register value.
         */
-       ret = readx_poll_timeout(adin1110_read_mdio_acc, priv, val,
-                                (val & ADIN1110_MDIO_TRDONE), 10000, 30000);
+       ret = readx_poll_timeout_atomic(adin1110_read_mdio_acc, priv, val,
+                                       (val & ADIN1110_MDIO_TRDONE),
+                                       100, 30000);
        if (ret < 0)
                return ret;
 
@@ -495,8 +496,9 @@ static int adin1110_mdio_write(struct mii_bus *bus, int phy_id,
        if (ret < 0)
                return ret;
 
-       return readx_poll_timeout(adin1110_read_mdio_acc, priv, val,
-                                 (val & ADIN1110_MDIO_TRDONE), 10000, 30000);
+       return readx_poll_timeout_atomic(adin1110_read_mdio_acc, priv, val,
+                                        (val & ADIN1110_MDIO_TRDONE),
+                                        100, 30000);
 }
 
 /* ADIN1110 MAC-PHY contains an ADIN1100 PHY.