[U-Boot] [V3 1/3] sunxi: Fix A33 memory initialization

[Shyam Saini]

From: Michael Trimarchi <michael at amarulasolutions.com>

While the exact problem is not known, based on discussion between
Philipp Tomsich and André Przywara it is guessed that exit self-refresh
timing is not set with correct value. There may be implicit enter or
exit Self-Refresh anywhere  as part of some training phase.

In ZynqMP register guide [1], which is close to the various
Allwinner DRAM controllers, tXSDLL is bits [14:8], while the non-DLL
tXS is bits [6:0]: Self refresh exit delay. So it could be safely
increased and it only affects the time after the self-refresh “exit”,
which happens only after (re-)initialisation.

There was no document for cpu in question so based on oscilloscope
readings [2][3] and observed result by comparing allwinner architecture.
So set it same as  Allwinner H5 silicon.

Before this patch, failure rate of was 7%.

This was tested on A33 allwinner cpu, dual rank connection connected
with two MT41K512M16HA-125:A memory model. Memory is configured as DDR3
1.5V

[1] https://www.xilinx.com/html_docs/registers/ug1087/ddrc___dramtmg8.html
[2] https://ibb.co/R70zmyS
[3] https://ibb.co/HVVCGQ8

Signed-off-by: Michael Trimarchi <michael at amarulasolutions.com>
Signed-off-by: Shyam Saini <shyam.saini at amarulasolutions.com>
---
Changelogs:
	   V1->V2: adjust commit message
           V2->V3: Adjust commit message based on V2 Discussion
---
 arch/arm/mach-sunxi/dram_sun8i_a33.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mach-sunxi/dram_sun8i_a33.c b/arch/arm/mach-sunxi/dram_sun8i_a33.c
index 1da2727f9874..5da01922bfaf 100644
--- a/arch/arm/mach-sunxi/dram_sun8i_a33.c
+++ b/arch/arm/mach-sunxi/dram_sun8i_a33.c
@@ -152,7 +152,7 @@ static void auto_set_timing_para(struct dram_para *para)
 	reg_val &= ~(0xff << 8);
 	reg_val &= ~(0xff << 0);
 	reg_val |= (0x33 << 8);
-	reg_val |= (0x8 << 0);
+	reg_val |= (0x10 << 0);
 	writel(reg_val, &mctl_ctl->dramtmg8);
 	/* Set phy interface time */
 	reg_val = (0x2 << 24) | (t_rdata_en << 16) | (0x1 << 8)
-- 
2.11.0