[PATCH net-next v6 4/6] dsa: lan9303: write reg only if necessary

[Jerry Ray]

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@xxxxxxxxxxxxx>
---
 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