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

[Peng Fan]

From: "Ye.Li" <ye.li at 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 at nxp.com>
Signed-off-by: Ye.Li <ye.li at nxp.com>
Cc: Stefano Babic <sbabic at 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