[REGRESSION] AMDISP failure with kernel v7.0-rc2 due to Commit: 02c057ddefef5

[Nirujogi, Pratap]

Hi Rafael,

In kernel version 7.0-rc2, the AMDISP device reports the following 
errors when created via mfd_add_hotplug_devices.

[    5.236645] ACPI: video: Video Device [GFX0] (multi-head: yes  rom: 
no  post: no)
[    5.236744] input: Video Bus as 
/devices/pci0000:00/0000:00:08.1/0000:c3:00.0/amd_isp_capture.1.auto/input/input21
[    5.236779] acpi device:14: Error installing notify handler
[    5.236782] acpi device:15: Error installing notify handler
[    5.236783] acpi device:16: Error installing notify handler
[    5.236784] acpi device:17: Error installing notify handler
[    5.236785] acpi device:18: Error installing notify handler
[    5.236786] acpi device:19: Error installing notify handler
[    5.236786] acpi device:1a: Error installing notify handler
[    5.236787] acpi device:1b: Error installing notify handler
[    5.236788] acpi device:1c: Error installing notify handler

These failures indicate AMDISP device is incorrectly detected as ACPI 
Video device while it is not.

The seems like a regression caused by the change that converts the ACPI 
video device to a platform device (commit: 02c057ddefef5).

Issue is not observed in 6.19-rc6, and also when this change is reverted 
in 7.0-rc2.

I really appreciate your inputs on addressing this issue and helping us 
make progress on 7.0 rc2.

Steps followed to reproduce the issue:

1. Apply AMDISP v9 patch series [1] on top of kernel v7.0-rc2
2. Add NULL check for “dev->type” in isp_genpd_add_device() [2] (to 
avoid kernel panic found in v7.0-rc2)
3. Build kernel with:
    - CONFIG_AMD_ISP_PLATFORM=y
    - CONFIG_VIDEO_AMD_ISP4_CAPTURE=m
4. Install kernel on AMDISP supported system (HP ZBook Ultra G1a)
5. Boot system to see the failures

[1] https://lore.kernel.org/all/20260302073020.148277-1-Bin.Du@xxxxxxx/
[2] 
https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/amd/amdgpu/isp_v4_1_1.c#L132

Thanks,
Pratap