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i.MX28: Shut down the LCD controller before reset

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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 <marex@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
This commit is contained in:
Marek Vasut 2012-05-01 11:09:47 +00:00 • committed by Albert ARIBAUD
parent cfe96f7820
commit 8d4c759f2c
1 changed files with 8 additions and 1 deletions
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9
arch/arm/cpu/arm926ejs/mx28/mx28.c
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@ -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);