[PATCH v2 0/3] Support MediaTek devapc for MT8186

[Chen-Yu Tsai]

On Wed, May 4, 2022 at 7:55 PM Rex-BC Chen <rex-bc.chen at mediatek.com> wrote:
>
> This series is for supporting devapc implementation in MT8186.
>
> V2:
> - Add a patch to separate register offsets from mtk_devapc_data.
>
> V1:
> - Add dt-binding and add devapc data for MT8186.
>
> Rex-BC Chen (3):
>   dt-bindings: soc: mediatek: devapc: Add bindings for MT8186
>   soc: mediatek: devapc: Separate register offsets from mtk_devapc_data
>   soc: mediatek: devapc: Add support for MT8186

Applied this on next-20220602 (with a few fixes for other section mismatch
errors), booted and got:

[    1.948483] mtk-devapc 10207000.devapc: Read Violation
[    1.948488] mtk-devapc 10207000.devapc: Bus ID:0x100, Dom ID:0x0,
Vio Addr:0x13000000
[    1.948520] mtk-devapc 10207000.devapc: Read Violation
[    1.948523] mtk-devapc 10207000.devapc: Bus ID:0x200, Dom ID:0x0,
Vio Addr:0x140001a0
[    1.948537] mtk-devapc 10207000.devapc: Read Violation
[    1.948540] mtk-devapc 10207000.devapc: Bus ID:0x200, Dom ID:0x0,
Vio Addr:0x140001a0
[    1.948555] mtk-devapc 10207000.devapc: Read Violation
[    1.948558] mtk-devapc 10207000.devapc: Bus ID:0x200, Dom ID:0x0,
Vio Addr:0x14000100
[    1.948573] mtk-devapc 10207000.devapc: Read Violation
[    1.948576] mtk-devapc 10207000.devapc: Bus ID:0x200, Dom ID:0x0,
Vio Addr:0x14000100
[    1.948590] mtk-devapc 10207000.devapc: Read Violation
[    1.948593] mtk-devapc 10207000.devapc: Bus ID:0x200, Dom ID:0x0,
Vio Addr:0x14000100
[    1.948607] mtk-devapc 10207000.devapc: Read Violation
[    1.948610] mtk-devapc 10207000.devapc: Bus ID:0x200, Dom ID:0x0,
Vio Addr:0x14000100
[    1.948624] mtk-devapc 10207000.devapc: Read Violation
[    1.948627] mtk-devapc 10207000.devapc: Bus ID:0x200, Dom ID:0x0,
Vio Addr:0x14000100

during the boot process. So I think this works well. Manually reading a
known secure address also triggers it:

root at hayato:~# busybox devmem 0x1000e000
0x00000000
[  135.069121] mtk-devapc 10207000.devapc: Read Violation
[  135.069132] mtk-devapc 10207000.devapc: Bus ID:0x482, Dom ID:0x0,
Vio Addr:0x1000e000

So,

Tested-by: Chen-Yu Tsai <wenst at chromium.org>

BTW, looks like MT8186 support in mainline is shaping up real good.
SCP firmware is still missing, so video codec stuff won't work.