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
And also this is tested in A33-OLinuXino dev board.
[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@amarulasolutions.com>
Signed-off-by: Shyam Saini <shyam.saini@amarulasolutions.com>
Acked-by: Jagan Teki <jagan@openedev.com>
When we initialize the memory we need to autodetect rank and size
but this can happen only if we send the proper reset to both
memory module including cke signal.
For this reason we need initialize the physical on both channel because
we need to presume that both are connected. This way let the CLKE to be
activated at the right time with the memory reset coming from the cpu
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from. So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry. Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.
In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.
This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents. There's also a few places where I found we did not have a tag
and have introduced one.
Signed-off-by: Tom Rini <trini@konsulko.com>
Some of the code in arch/arm/cpu/armv7/sunxi is actually armv7 specific, while
most of it is just generic code that could as well be used on an AArch64 SoC.
Move all files that are not really tied to armv7 into a new mach-sunxi
directory.
Signed-off-by: Alexander Graf <agraf@suse.de>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2016-04-01 09:52:28 +02:00
Renamed from arch/arm/cpu/armv7/sunxi/dram_sun8i_a33.c (Browse further)
