at91_emac.c: poll for IDLE when writing PHY

This patch replaces the unnecessary waiting in at91emac_read() and
at91emac_write() by checking the IDLE flag.

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>

diff --git a/drivers/net/at91_emac.c b/drivers/net/at91_emac.c
index 009a275f66864dd259832ee1b0937ddc013a53db..ca2b16bf8f3af310cc5fb7550e21178f68518ba2 100644 (file)
--- a/drivers/net/at91_emac.c
+++ b/drivers/net/at91_emac.c
@@ -127,13 +127,19 @@ void at91emac_DisableMDIO(at91_emac_t *at91mac)
 int  at91emac_read(at91_emac_t *at91mac, unsigned char addr,
                unsigned char reg, unsigned short *value)
 {
+       unsigned long netstat;
        at91emac_EnableMDIO(at91mac);
 
        writel(AT91_EMAC_MAN_HIGH | AT91_EMAC_MAN_RW_R |
                AT91_EMAC_MAN_REGA(reg) | AT91_EMAC_MAN_CODE_802_3 |
                AT91_EMAC_MAN_PHYA(addr),
                &at91mac->man);
-       udelay(10000);
+
+       do {
+               netstat = readl(&at91mac->sr);
+               DEBUG_AT91PHY("poll SR %08lx\n", netstat);
+       } while (!(netstat & AT91_EMAC_SR_IDLE));
+
        *value = readl(&at91mac->man) & AT91_EMAC_MAN_DATA_MASK;
 
        at91emac_DisableMDIO(at91mac);
@@ -146,6 +152,7 @@ int  at91emac_read(at91_emac_t *at91mac, unsigned char addr,
 int  at91emac_write(at91_emac_t *at91mac, unsigned char addr,
                unsigned char reg, unsigned short value)
 {
+       unsigned long netstat;
        DEBUG_AT91PHY("AT91PHY write %x REG(%d)=%x\n", at91mac, reg, &value)
 
        at91emac_EnableMDIO(at91mac);
@@ -154,9 +161,14 @@ int  at91emac_write(at91_emac_t *at91mac, unsigned char addr,
                AT91_EMAC_MAN_REGA(reg) | AT91_EMAC_MAN_CODE_802_3 |
                AT91_EMAC_MAN_PHYA(addr) | (value & AT91_EMAC_MAN_DATA_MASK),
                &at91mac->man);
-       udelay(10000);
+
+       do {
+               netstat = readl(&at91mac->sr);
+               DEBUG_AT91PHY("poll SR %08lx\n", netstat);
+       } while (!(netstat & AT91_EMAC_SR_IDLE));
 
        at91emac_DisableMDIO(at91mac);
+
        return 0;
 }