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 <ma...@denx.de>
Cc: Detlev Zundel <d...@denx.de>
Cc: Fabio Estevam <feste...@gmail.com>
Cc: Stefano Babic <sba...@denx.de>
Cc: Wolfgang Denk <w...@denx.de>
---
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 865dbb3..a82ff25 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);
--
1.7.10
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