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driver/net/fm/memac_phy: set NEG bit for external MDIOs

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NEG bit default is '1' for external MDIOs as per FMAN-v3 RM, but on some
platforms, e.g. T2080QDS, this bit is '0', which leads to MDIO failure
on XAUI PHY, so set this bit definitely to align with the RM.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: York Sun <yorksun@freescale.com>
This commit is contained in:
Shaohui Xie 2014-08-13 18:38:09 +08:00 committed by York Sun
parent ff5fb2a36d
commit ae6b458306
2 changed files with 5 additions and 1 deletions
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1
arch/powerpc/include/asm/fsl_memac.h
View file

@ -244,6 +244,7 @@ struct memac_mdio_controller {
#define MDIO_STAT_PRE (1 << 5)
#define MDIO_STAT_ENC (1 << 6)
#define MDIO_STAT_HOLD_15_CLK (7 << 2)
#define MDIO_STAT_NEG (1 << 23)
#define MDIO_CTL_DEV_ADDR(x) (x & 0x1f)
#define MDIO_CTL_PORT_ADDR(x) ((x & 0x1f) << 5)

5
drivers/net/fm/memac_phy.c
View file

@ -139,9 +139,12 @@ int fm_memac_mdio_init(bd_t *bis, struct memac_mdio_info *info)
* is zero, so MDIO clock is disabled.
* So, for proper functioning of MDIO, MDIO_CLK_DIV bits needs to
* be properly initialized.
* NEG bit default should be '1' as per FMAN-v3 RM, but on platform
* like T2080QDS, this bit default is '0', which leads to MDIO failure
* on XAUI PHY, so set this bit definitely.
*/
setbits_be32(&((struct memac_mdio_controller *)info->regs)->mdio_stat,
MDIO_STAT_CLKDIV(258));
MDIO_STAT_CLKDIV(258) | MDIO_STAT_NEG);
return mdio_register(bus);
}