[U-Boot] [PATCH] net: fec_mxc: fix mii_speed configuration for MX6's
Markus Niebel
list-09_u-boot at tqsc.de
Thu Feb 20 08:40:03 CET 2014
Hello Phillip,
Am 19.02.2014 15:27, wrote Philippe De Muyter:
> On MX6DL at least, measured mdc speed was wrong (3.3 Mhz instead of 2.5
> Mhz), because of wrong assumptions about the reference clock and the
> way the divider is used.
>
> I have fixed that for all MX6's by using the IPG clock as the reference
> clock, and applying the - 1 correction when we have a ENET MAC instead
> of a FEC MAC, just like what is done in the fec linux driver.
this should be fixed with
ARM: imx6: fix wrong fec clk
NET: fec_mxc: fix MDIO clock prescaler calculation
and was pulled yesterday to
u-boot-arm/master
>
> Signed-off-by: Philippe De Muyter <phdm at macqel.be>
> ---
> drivers/net/fec_mxc.c | 20 +++++++++++++++++---
> 1 files changed, 17 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
> index 3b2b995..3ab0ecd 100644
> --- a/drivers/net/fec_mxc.c
> +++ b/drivers/net/fec_mxc.c
> @@ -124,13 +124,27 @@ static int fec_mdio_read(struct ethernet_regs *eth, uint8_t phyAddr,
>
> static void fec_mii_setspeed(struct ethernet_regs *eth)
> {
> + u32 sysclock;
> + u32 mii_speed;
> +
> /*
> * Set MII_SPEED = (1/(mii_speed * 2)) * System Clock
> * and do not drop the Preamble.
> + * shift the result by 1, because MII_SPEED field is at bits 6..1.
> */
> - writel((((imx_get_fecclk() / 1000000) + 2) / 5) << 1,
> - ð->mii_speed);
> - debug("%s: mii_speed %08x\n", __func__, readl(ð->mii_speed));
> +#if defined(CONFIG_MX6)
> + sysclock = mxc_get_clock(MXC_IPG_CLK);
> +#else
> + sysclock = imx_get_fecclk();
> +#endif
> +#define MIIM_SPEED 2500000
> + mii_speed = DIV_ROUND_UP(sysclock, (MIIM_SPEED * 2));
> +#ifdef FEC_QUIRK_ENET_MAC
> + mii_speed -= 1;
> +#endif
> + writel(mii_speed << 1, ð->mii_speed);
> + debug("%s: sysclock %u, mii_speed %08x\n", __func__, sysclock,
> + readl(ð->mii_speed));
> }
>
> static int fec_mdio_write(struct ethernet_regs *eth, uint8_t phyAddr,
>
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