[U-Boot] [PATCH] ARM: mxs: Do not reconfigure FEC clock in FEC init

[Hector Palacios <hector.palacios@digi.com>]

Dear Marek,

On 10/13/2013 05:20 PM, Marek Vasut wrote:
> Do not reconfigure the FEC clock during board_eth_init(), otherwise
> the FEC might have stability issues, refuse to autonegotiate link
> entirely or even corrupt packets while indicating correct checksum
> on them. Instead, move the FEC clock init to board_early_init_f(),
> where all the other upstream clock are initialized and also make
> sure there is proper stabilization delay.
>
> Signed-off-by: Marek Vasut <marex@denx.de>
> Cc: Fabio Estevam <fabio.estevam@freescale.com>
> Cc: Hector Palacios <hector.palacios@digi.com>
> Cc: Oliver Metz <oliver@freetz.org>
> Cc: Otavio Salvador <otavio@ossystems.com.br>
> Cc: Stefano Babic <sbabic@denx.de>
> Cc: Tom Rini <trini@ti.com>
> ---
>   board/bluegiga/apx4devkit/apx4devkit.c   | 10 ++++------
>   board/denx/m28evk/m28evk.c               | 21 +++++++++++----------
>   board/freescale/mx28evk/mx28evk.c        |  9 +++++----
>   board/schulercontrol/sc_sps_1/sc_sps_1.c | 19 +++++++++++--------
>   4 files changed, 31 insertions(+), 28 deletions(-)

[...]

> diff --git a/board/freescale/mx28evk/mx28evk.c b/board/freescale/mx28evk/mx28evk.c
> index 5005fe2..2c93c44 100644
> --- a/board/freescale/mx28evk/mx28evk.c
> +++ b/board/freescale/mx28evk/mx28evk.c
> @@ -41,6 +41,11 @@ int board_early_init_f(void)
>   	/* SSP2 clock at 160MHz */
>   	mxs_set_sspclk(MXC_SSPCLK2, 160000, 0);
>
> +#ifdef CONFIG_CMD_NET
> +	cpu_eth_init(NULL);
> +	udelay(10000);
> +#endif
> +
>   #ifdef	CONFIG_CMD_USB
>   	mxs_iomux_setup_pad(MX28_PAD_SSP2_SS1__USB1_OVERCURRENT);
>   	mxs_iomux_setup_pad(MX28_PAD_AUART2_RX__GPIO_3_8 |
> @@ -102,10 +107,6 @@ int board_eth_init(bd_t *bis)
>   	struct eth_device *dev;
>   	int ret;
>
> -	ret = cpu_eth_init(bis);
> -	if (ret)
> -		return ret;
> -
>   	/* MX28EVK uses ENET_CLK PAD to drive FEC clock */
>   	writel(CLKCTRL_ENET_TIME_SEL_RMII_CLK | CLKCTRL_ENET_CLK_OUT_EN,
>   	       &clkctrl_regs->hw_clkctrl_enet);

Why didn't you move the clk enable instruction on mx28evk, as you did with the rest of 
platforms?


Best regards,
--
Hector Palacios