From 8d4c759f2c165c1a6a6e840867eb59d92bfe998f Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Tue, 1 May 2012 11:09:47 +0000 Subject: [PATCH] i.MX28: Shut down the LCD controller before reset If the LCD controller is on before the CPU goes into reset, the traffic on LCDIF data pins interferes with the BootROM's boot mode sampling. So shut the controller down. Signed-off-by: Marek Vasut Cc: Detlev Zundel Cc: Fabio Estevam Cc: Stefano Babic Cc: Wolfgang Denk --- arch/arm/cpu/arm926ejs/mx28/mx28.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/arm/cpu/arm926ejs/mx28/mx28.c b/arch/arm/cpu/arm926ejs/mx28/mx28.c index 865dbb3ffd..a82ff2564b 100644 --- a/arch/arm/cpu/arm926ejs/mx28/mx28.c +++ b/arch/arm/cpu/arm926ejs/mx28/mx28.c @@ -51,9 +51,16 @@ void reset_cpu(ulong ignored) __attribute__((noreturn)); void reset_cpu(ulong ignored) { - struct mx28_rtc_regs *rtc_regs = (struct mx28_rtc_regs *)MXS_RTC_BASE; + struct mx28_lcdif_regs *lcdif_regs = + (struct mx28_lcdif_regs *)MXS_LCDIF_BASE; + + /* + * Shut down the LCD controller as it interferes with BootROM boot mode + * pads sampling. + */ + writel(LCDIF_CTRL_RUN, &lcdif_regs->hw_lcdif_ctrl_clr); /* Wait 1 uS before doing the actual watchdog reset */ writel(1, &rtc_regs->hw_rtc_watchdog); -- 2.39.5