[U-Boot] [PATCH 3/4 V2] i.MX28: Add delay after CPU bypass is cleared

Marek Vasut
2012-05-03T15:47:20Z

This solves issues when larger amount of DRAM is used. Behave the
same in case of CPU bypass as we do in case of EMI bypass, wait
15 ms. We need to wait until the clock domain stabilizes.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
---

V2: Change the description, this issue seemed to have been caused by not
waiting after frobbing with the CPU bypass, it was unrelated to memory,
but had a direct impact, causing trouble. This was yet another X-File
of the imx-bootlets, sigh.

arch/arm/cpu/arm926ejs/mx28/spl_mem_init.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/arm/cpu/arm926ejs/mx28/spl_mem_init.c b/arch/arm/cpu/arm926ejs/mx28/spl_mem_init.c
index 0d13537..a9b1bb6 100644
--- a/arch/arm/cpu/arm926ejs/mx28/spl_mem_init.c
+++ b/arch/arm/cpu/arm926ejs/mx28/spl_mem_init.c
@@ -149,6 +149,8 @@ void mx28_mem_setup_cpu_and_hbus(void)
/* Disable CPU bypass */
writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
&clkctrl_regs->hw_clkctrl_clkseq_clr);
+
+ early_delay(15000);
}

void mx28_mem_setup_vdda(void)
--
1.7.10