| Message ID | 20230117205703.25960-5-jerry.ray@microchip.com |
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From: Jerry Ray <jerry.ray@microchip.com>
To: Andrew Lunn <andrew@lunn.ch>,
Florian Fainelli <f.fainelli@gmail.com>,
Vladimir Oltean <olteanv@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
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Russell King <linux@armlinux.org.uk>, <jbe@pengutronix.de>,
<netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
Jerry Ray <jerry.ray@microchip.com>
Subject: [net-next: PATCH v7 4/7] dsa: lan9303: write reg only if necessary
Date: Tue, 17 Jan 2023 14:57:00 -0600
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| Series |
dsa: lan9303: Move to PHYLINK
|
|
Commit Message
Jerry Ray
Jan. 17, 2023, 8:57 p.m. UTC
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@microchip.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 66466d50d015..a4decf42a002 100644 --- a/drivers/net/dsa/lan9303-core.c +++ b/drivers/net/dsa/lan9303-core.c @@ -915,8 +915,11 @@ static int lan9303_setup(struct dsa_switch *ds) 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); + } ret = lan9303_setup_tagging(chip); if (ret)