sysmo-bts
/
barebox
9
0
Fork 0
Code Releases Activity

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/net/arc_emac.c
View File

@ -17,6 +17,7 @@
*/ */
#include <asm/mmu.h> #include <asm/mmu.h>
#include <clock.h>
#include <common.h> #include <common.h>
#include <net.h> #include <net.h>
#include <io.h> #include <io.h>
@ -342,26 +343,18 @@ static int arc_emac_set_ethaddr(struct eth_device *edev, unsigned char *mac)
return 0; 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) 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++) { while (!is_timeout(start, 1000 * MSECOND)) {
unsigned int status = arc_reg_get(priv, R_STATUS); if (arc_reg_get(priv, R_STATUS) & MDIO_MASK) {
status &= MDIO_MASK;
if (status) {
/* Reset "MDIO complete" flag */ /* Reset "MDIO complete" flag */
arc_reg_set(priv, R_STATUS, status); arc_reg_set(priv, R_STATUS, MDIO_MASK);
return 0; return 0;
} }
mdelay(25);
} }
return -ETIMEDOUT; return -ETIMEDOUT;
} }