The mux for the lcd clock is not glitchless, so need to first gate the clock before changing the mux.
Signed-off-by: Peng Fan peng.fan@nxp.com Cc: Stefano Babic sbabic@denx.de --- arch/arm/cpu/armv7/mx6/clock.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/arch/arm/cpu/armv7/mx6/clock.c b/arch/arm/cpu/armv7/mx6/clock.c index 8ab07b6..644b9d7 100644 --- a/arch/arm/cpu/armv7/mx6/clock.c +++ b/arch/arm/cpu/armv7/mx6/clock.c @@ -771,6 +771,16 @@ int enable_lcdif_clock(u32 base_addr) return 0; }
+ /* Gate LCDIF clock first */ + reg = readl(&imx_ccm->CCGR3); + reg &= ~lcdif_ccgr3_mask; + writel(reg, &imx_ccm->CCGR3); + + reg = readl(&imx_ccm->CCGR2); + reg &= ~MXC_CCM_CCGR2_LCD_MASK; + writel(reg, &imx_ccm->CCGR2); + + /* Select pre-mux */ reg = readl(&imx_ccm->cscdr2); reg &= ~lcdif_clk_sel_mask; writel(reg, &imx_ccm->cscdr2);