[U-Boot] [PATCH] imx: mx6sx: Disable ENET clock before switching clock parent

[Peng Fan <van.freenix@gmail.com>]

Hi Stefano,

Ping..

Thanks,
Peng.
On Sat, Oct 08, 2016 at 04:58:29PM +0800, Peng Fan wrote:
>From: "Ye.Li" <ye.li@nxp.com>
>
>Need to gate ENET clock when switching to a new clock parent, because
>the mux is not glitchless.
>
>Signed-off-by: Peng Fan <peng.fan@nxp.com>
>Signed-off-by: Ye.Li <ye.li@nxp.com>
>Cc: Stefano Babic <sbabic@denx.de>
>---
> arch/arm/cpu/armv7/mx6/clock.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
>diff --git a/arch/arm/cpu/armv7/mx6/clock.c b/arch/arm/cpu/armv7/mx6/clock.c
>index ae3143c..96fbd81 100644
>--- a/arch/arm/cpu/armv7/mx6/clock.c
>+++ b/arch/arm/cpu/armv7/mx6/clock.c
>@@ -881,6 +881,11 @@ int enable_fec_anatop_clock(int fec_id, enum enet_freq freq)
> 	writel(reg, &anatop->pll_enet);
> 
> #ifdef CONFIG_MX6SX
>+	/* Disable enet system clcok before switching clock parent */
>+	reg = readl(&imx_ccm->CCGR3);
>+	reg &= ~MXC_CCM_CCGR3_ENET_MASK;
>+	writel(reg, &imx_ccm->CCGR3);
>+
> 	/*
> 	 * Set enet ahb clock to 200MHz
> 	 * pll2_pfd2_396m-> ENET_PODF-> ENET_AHB
>-- 
>2.6.2
>