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net: arc_emac: remove delay from mdio polling loop 

Avoid unneeded delay when waiting for the completion of a mdio
operation and return as soon as possible.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Beniamino Galvani 2014-05-19 22:34:59 +02:00 committed by Sascha Hauer
parent b4ce62d3d2
commit b158af4f08
1 changed files with 6 additions and 13 deletions
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19
drivers/net/arc_emac.c
View File

@ -17,6 +17,7 @@
*/
#include <asm/mmu.h>
#include <clock.h>
#include <common.h>
#include <net.h>
#include <io.h>
@ -342,26 +343,18 @@ static int arc_emac_set_ethaddr(struct eth_device *edev, unsigned char *mac)
return 0;
}
/* Number of seconds we wait for "MDIO complete" flag to appear */
#define ARC_MDIO_COMPLETE_POLL_COUNT 1
static int arc_mdio_complete_wait(struct arc_emac_priv *priv)
{
unsigned int i;
uint64_t start = get_time_ns();
for (i = 0; i < ARC_MDIO_COMPLETE_POLL_COUNT * 40; i++) {
unsigned int status = arc_reg_get(priv, R_STATUS);
status &= MDIO_MASK;
if (status) {
while (!is_timeout(start, 1000 * MSECOND)) {
if (arc_reg_get(priv, R_STATUS) & MDIO_MASK) {
/* Reset "MDIO complete" flag */
arc_reg_set(priv, R_STATUS, status);
arc_reg_set(priv, R_STATUS, MDIO_MASK);
return 0;
}
mdelay(25);
}
return -ETIMEDOUT;
}