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Commit 2e1c8084 authored by Maxim Uvarov's avatar Maxim Uvarov Committed by David S. Miller
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drivers: net: davinci_mdio: remove busy loop on wait user access 



Polling 14 mdio devices on single mdio bus eats 30% of 1Ghz cpu time
due to busy loop in wait(). Add small delay to relax cpu.

Signed-off-by: default avatarMax Uvarov <muvarov@gmail.com>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Reviewed-by: default avatarGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3a4487b8

drivers/net/ethernet/ti/davinci_mdio.c

+3 −1
Original line number Diff line number Diff line
@@ -198,8 +198,10 @@ static inline int wait_for_user_access(struct davinci_mdio_data *data) 
			return 0;



		reg = __raw_readl(&regs->control);

		if ((reg & CONTROL_IDLE) == 0)

		if ((reg & CONTROL_IDLE) == 0) {

			usleep_range(100, 200);

			continue;

		}



		/*

		 * An emac soft_reset may have clobbered the mdio controller's