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dsa: lan9303: write reg only if necessary

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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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jerry Ray 2023-01-17 14:57:00 -06:00 committed by David S. Miller
parent 601f574a1b
commit de375aa860
1 changed files with 5 additions and 2 deletions
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7
drivers/net/dsa/lan9303-core.c
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@ -915,8 +915,11 @@ static int lan9303_setup(struct dsa_switch *ds)
if (ret) if (ret)
return (ret); return (ret);
reg &= ~LAN9303_VIRT_SPECIAL_TURBO; /* Clear the TURBO Mode bit if it was set. */
regmap_write(chip->regmap, LAN9303_VIRT_SPECIAL_CTRL, reg); 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); ret = lan9303_setup_tagging(chip);
if (ret) if (ret)