linux-kernel - [PATCH] net: mdio: mdio-bcm-unimac: Delay before first poll

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Message-Id: <20231213000249.2020835-1-justin.chen@broadcom.com>
Date:   Tue, 12 Dec 2023 16:02:49 -0800
From:   Justin Chen <justin.chen@...adcom.com>
To:     netdev@...r.kernel.org
Cc:     Justin Chen <justin.chen@...adcom.com>,
        Doug Berger <opendmb@...il.com>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] net: mdio: mdio-bcm-unimac: Delay before first poll

With a clock interval of 400 nsec and a 64 bit transactions (32 bit
preamble & 16 bit control & 16 bit data), it is reasonable to assume
the mdio transaction will take 25.6 usec. Add a 30 usec delay before
the first poll to reduce the chance of a 1000-2000 usec sleep.

Reduce the timeout from 1000ms to 100ms as it is unlikely for the bus
to take this long.

Signed-off-by: Justin Chen <justin.chen@...adcom.com>
---
 drivers/net/mdio/mdio-bcm-unimac.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mdio/mdio-bcm-unimac.c b/drivers/net/mdio/mdio-bcm-unimac.c
index e8cd8eef319b..1f89b1bdb90f 100644
--- a/drivers/net/mdio/mdio-bcm-unimac.c
+++ b/drivers/net/mdio/mdio-bcm-unimac.c
@@ -81,7 +81,9 @@ static inline unsigned int unimac_mdio_busy(struct unimac_mdio_priv *priv)
 static int unimac_mdio_poll(void *wait_func_data)
 {
 	struct unimac_mdio_priv *priv = wait_func_data;
-	unsigned int timeout = 1000;
+	unsigned int timeout = 100;
+
+	udelay(30);
 
 	do {
 		if (!unimac_mdio_busy(priv))
-- 
2.34.1


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