diff options
Diffstat (limited to 'recipes-bsp/u-boot/u-boot-v2012.04.01/0049-i.MX28-Shut-down-the-LCD-controller-before-reset.patch')
| -rw-r--r-- | recipes-bsp/u-boot/u-boot-v2012.04.01/0049-i.MX28-Shut-down-the-LCD-controller-before-reset.patch | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/recipes-bsp/u-boot/u-boot-v2012.04.01/0049-i.MX28-Shut-down-the-LCD-controller-before-reset.patch b/recipes-bsp/u-boot/u-boot-v2012.04.01/0049-i.MX28-Shut-down-the-LCD-controller-before-reset.patch new file mode 100644 index 0000000..724477f --- /dev/null +++ b/recipes-bsp/u-boot/u-boot-v2012.04.01/0049-i.MX28-Shut-down-the-LCD-controller-before-reset.patch @@ -0,0 +1,43 @@ +From 589511bd8e847c1990216aa89e56dca0fabac4e2 Mon Sep 17 00:00:00 2001 +From: Marek Vasut <marex@denx.de> +Date: Tue, 1 May 2012 11:09:47 +0000 +Subject: [PATCH 49/56] 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 <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> +--- + 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 + |