netdev - [net-next] net: ethernet: adi: adin1110: Reduce the MDIO

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Date: Fri, 16 Feb 2024 12:36:32 +0200
From: Ciprian Regus <ciprian.regus@...log.com>
To: <linux-kernel@...r.kernel.org>
CC: Ciprian Regus <ciprian.regus@...log.com>,
        "David S. Miller"
	<davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Simon Horman
	<horms@...nel.org>,
        Dell Jin <dell.jin.code@...look.com>,
        "Amit Kumar
 Mahapatra" <amit.kumar-mahapatra@....com>,
        Yang Yingliang
	<yangyingliang@...wei.com>, <netdev@...r.kernel.org>
Subject: [net-next] 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.

Signed-off-by: Ciprian Regus <ciprian.regus@...log.com>
---
 drivers/net/ethernet/adi/adin1110.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/adi/adin1110.c b/drivers/net/ethernet/adi/adin1110.c
index d7c274af6d4d..6fca19e6ae67 100644
--- a/drivers/net/ethernet/adi/adin1110.c
+++ b/drivers/net/ethernet/adi/adin1110.c
@@ -467,3 +467,3 @@ static int adin1110_mdio_read(struct mii_bus *bus, int phy_id, int reg)
 	ret = readx_poll_timeout(adin1110_read_mdio_acc, priv, val,
-				 (val & ADIN1110_MDIO_TRDONE), 10000, 30000);
+				 (val & ADIN1110_MDIO_TRDONE), 100, 30000);
 	if (ret < 0)
@@ -498,3 +498,3 @@ static int adin1110_mdio_write(struct mii_bus *bus, int phy_id,
 	return readx_poll_timeout(adin1110_read_mdio_acc, priv, val,
-				  (val & ADIN1110_MDIO_TRDONE), 10000, 30000);
+				  (val & ADIN1110_MDIO_TRDONE), 100, 30000);
 }
-- 
2.39.2