From de375aa860fb848eaabc76dce0af2e982630b421 Mon Sep 17 00:00:00 2001 From: Jerry Ray Date: Tue, 17 Jan 2023 14:57:00 -0600 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- 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 66466d50d0156..a4decf42a0024 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) -- 2.30.2