Re: [PATCH 0/8] sunxi: Update H616 DRAM driver

Andre Przywara
2022-12-12T01:06:46Z

On Sun, 11 Dec 2022 17:32:05 +0100
Jernej Skrabec <jernej.skrabec@gmail.com> wrote:

Hi Jernej,

many thanks for putting this together!
I will have a more elaborate look at each patch later.

> Current H616 DRAM driver is completely customized to Orange Pi Zero2
> board, which is currently the only H616 board supported by U-Boot.

Not anymore, I merged the X96 Mate support lately, after the DT got
merged into the Linux tree.

Those are the values for the box I came up with:
CONFIG_DRAM_SUN50I_H616_DX_ODT=0x03030303
CONFIG_DRAM_SUN50I_H616_DX_DRI=0x0e0e0e0e
CONFIG_DRAM_SUN50I_H616_CA_DRI=0x1c12
CONFIG_DRAM_SUN50I_H616_TPR0=0xc0000c05
CONFIG_DRAM_SUN50I_H616_TPR10=0x2f0007
CONFIG_DRAM_SUN50I_H616_TPR11=0xffffdddd
CONFIG_DRAM_SUN50I_H616_TPR12=0xfedf7557

based on this boot0 found in some firmware update image:
00045400 be 02 00 ea 65 47 4f 4e 2e 42 54 30 cc ba f3 80 |....eGON.BT0....|
00045410 00 c0 00 00 30 00 00 00 00 00 00 00 00 00 02 00 |....0...........|
00045420 00 00 02 00 00 00 00 00 00 00 00 00 34 2e 30 00 |............4.0.|
00045430 00 00 00 00 03 00 00 00 88 02 00 00 03 00 00 00 |................|
00045440 03 03 03 03 0e 0e 0e 0e 12 1c 00 00 01 00 00 00 |................|
00045450 fb 30 00 00 00 00 00 00 40 08 00 00 04 00 00 00 |.0......@.......|
00045460 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00045470 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00045480 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00045490 05 0c 00 c0 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000454a0 80 80 80 33 07 00 2f 00 dd dd ff ff 57 75 df fe |...3../.....Wu..|
000454b0 40 00 00 00 00 00 00 00 00 00 00 00 08 00 02 01 |@...............|

I would be grateful if you could verify this.

I built it, and it reported the 4GB correctly, also managed to boot into
Linux just fine. No extensive testing, nor didn't I compare register
dumps or disassembly (yet).

Cheers,
Andre

P.S. Any plans on upstreaming support for your T95 <whatever> H616 TV
box? That would probably help the case here.

> Needless to say, this is not ideal for adding new boards. With changes
> in this series, all DDR3 boards are supported and all that is needed is
> just vendor DRAM values extracted from Android image. New DRAM types
> should also be easier to support, since a lot of constants used before
> are not really DRAM type dependent.
>
> Changes were verified by decompiling driver and generated values were
> compared to previous, hard coded ones. This was done without dram_para
> structures, so compiler was able to heavily optimize code and produce
> constants.
>
> Please take a look.
>
> Best regards,
> Jernej
>
> Jernej Skrabec (8):
> sunxi: Fix write to H616 DRAM CR register
> sunxi: cosmetic: Fix H616 DRAM driver code style
> sunxi: parameterize H616 DRAM ODT values
> sunxi: Convert H616 DRAM options to single setting
> sunxi: Always configure ODT on H616 DRAM
> sunxi: Make bit delay function in H616 DRAM code void
> sunxi: Parameterize bit delay code in H616 DRAM driver
> sunxi: Parameterize H616 DRAM code some more
>
> .../include/asm/arch-sunxi/dram_sun50i_h616.h | 18 +
> arch/arm/mach-sunxi/Kconfig | 67 +--
> arch/arm/mach-sunxi/dram_sun50i_h616.c | 445 +++++++++++-------
> configs/orangepi_zero2_defconfig | 8 +-
> 4 files changed, 348 insertions(+), 190 deletions(-)
>