Add a comment about the tRAS lockout setting of HW_DRAM_CTL08 to
enable the 'Fast Auto Pre-Charge' found in the memory chip. The
setting is applied after memory initialization and it is worth
document it.

Signed-off-by: Otavio Salvador <ota...@ossystems.com.br>
---
Changes in v3:
- Extend code comment to be more verbose (Marek)

Changes in v2:
- Extend code comment to explicit say it needs to be there.

 arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c 
b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
index f8392f6..4db9baa 100644
--- a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
+++ b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
@@ -119,6 +119,10 @@ static void initialize_dram_values(void)
                writel(dram_vals[i], MXS_DRAM_BASE + (4 * i));
 
 #ifdef CONFIG_MX23
+       /*
+        * Enable tRAS lockout in HW_DRAM_CTL08 ; it must be the last
+        * element to be set
+        */
        writel((1 << 24), MXS_DRAM_BASE + (4 * 8));
 #endif
 }
-- 
1.8.1

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