[U-Boot] [PATCH] imx: mx6: Fix incorrect clear mmdc_ch0 handshake mask

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

From: Ye Li <ye.li@nxp.com>

Since the MX6UL/SL/SX only has one DDR channel, in CCM_CCDR register
the bit[17] for mmdc_ch0 is reserved and its proper state should be 1.
When clear this bit, the periph_clk_sel cannot be set and that
CDHIPR[periph_clk_sel_busy] handshake never clears.

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <van.freenix@gmail.com>
---
 arch/arm/cpu/armv7/mx6/soc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c
index 91a3deb..bdd41b0 100644
--- a/arch/arm/cpu/armv7/mx6/soc.c
+++ b/arch/arm/cpu/armv7/mx6/soc.c
@@ -278,7 +278,10 @@ static void clear_mmdc_ch_mask(void)
 	reg = readl(&mxc_ccm->ccdr);
 
 	/* Clear MMDC channel mask */
-	reg &= ~(MXC_CCM_CCDR_MMDC_CH1_HS_MASK | MXC_CCM_CCDR_MMDC_CH0_HS_MASK);
+	if (is_cpu_type(MXC_CPU_MX6SX) || is_cpu_type(MXC_CPU_MX6UL) || is_cpu_type(MXC_CPU_MX6SL))
+		reg &= ~(MXC_CCM_CCDR_MMDC_CH1_HS_MASK);
+	else
+		reg &= ~(MXC_CCM_CCDR_MMDC_CH1_HS_MASK | MXC_CCM_CCDR_MMDC_CH0_HS_MASK);
 	writel(reg, &mxc_ccm->ccdr);
 }
 
-- 
2.6.2