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Message-ID: <20230109211849.32530-5-jerry.ray@microchip.com>
Date: Mon, 9 Jan 2023 15:18:47 -0600
From: Jerry Ray <jerry.ray@...rochip.com>
To: Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Vladimir Oltean <olteanv@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
"Paolo Abeni" <pabeni@...hat.com>,
Russell King <linux@...linux.org.uk>, <jbe@...gutronix.de>,
<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Jerry Ray <jerry.ray@...rochip.com>
Subject: [PATCH net-next v6 4/6] dsa: lan9303: write reg only if necessary
As the regmap_write() is over a slow bus that will sleep, we can speed up
the boot-up time a bit by not bothering to clear a bit that is already
clear.
Signed-off-by: Jerry Ray <jerry.ray@...rochip.com>
---
drivers/net/dsa/lan9303-core.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
index 8eee340f6464..792ce6a26a6a 100644
--- a/drivers/net/dsa/lan9303-core.c
+++ b/drivers/net/dsa/lan9303-core.c
@@ -891,8 +891,11 @@ static int lan9303_check_device(struct lan9303 *chip)
if (ret)
return (ret);
- reg &= ~LAN9303_VIRT_SPECIAL_TURBO;
- regmap_write(chip->regmap, LAN9303_VIRT_SPECIAL_CTRL, reg);
+ /* Clear the TURBO Mode bit if it was set. */
+ if (reg & LAN9303_VIRT_SPECIAL_TURBO) {
+ reg &= ~LAN9303_VIRT_SPECIAL_TURBO;
+ regmap_write(chip->regmap, LAN9303_VIRT_SPECIAL_CTRL, reg);
+ }
return 0;
}
--
2.17.1
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