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NET: fec_mxc: fix MDIO clock prescaler calculation 

The prescaler value for MDC is calculated wrong for
MX6S. Implement the same logic as linux here which handles
ENET_MAC different then original FEC.

Tested on a custom board with i.MX6S and 100MBit PHY

Signed-off-by: Markus Niebel <Markus.Niebel@tqs.de>
This commit is contained in:
Markus Niebel 2014-02-05 10:54:11 +01:00 committed by Otavio Salvador
parent 0163b4c7a9
commit 029912e975
1 changed files with 6 additions and 2 deletions
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8
drivers/net/fec_mxc.c
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@ -128,8 +128,12 @@ static void fec_mii_setspeed(struct ethernet_regs *eth)
* Set MII_SPEED = (1/(mii_speed * 2)) * System Clock
* and do not drop the Preamble.
*/
writel((((imx_get_fecclk() / 1000000) + 2) / 5) << 1,
&eth->mii_speed);
register u32 speed = DIV_ROUND_UP(imx_get_fecclk(), 5000000);
#ifdef FEC_QUIRK_ENET_MAC
speed--;
#endif
speed <<= 1;
writel(speed, &eth->mii_speed);
debug("%s: mii_speed %08x\n", __func__, readl(&eth->mii_speed));
}