Re: [PATCH v2 0/8] Add AMD ISP4 driver

Du, Bin
2025-07-30T09:54:09Z

Hi Sultan, really glad to hear that you got your camera working

On 7/30/2025 1:38 PM, Sultan Alsawaf wrote:
> On Tue, Jul 29, 2025 at 06:13:50PM +0800, Du, Bin wrote:
>> On 7/29/2025 3:45 PM, Sultan Alsawaf wrote:
>>> On Tue, Jul 29, 2025 at 12:42:16AM -0700, Sultan Alsawaf wrote:
>>>> On Tue, Jul 29, 2025 at 11:32:23AM +0800, Du, Bin wrote:
>>>>> Thanks Sultan, please see my comments
>>>>>
>>>>> On 7/27/2025 6:31 AM, Sultan Alsawaf wrote:
>>>>>> On Fri, Jul 25, 2025 at 06:22:03PM +0800, Du, Bin wrote:
>>>>>>>> I have the Ryzen AI MAX+ 395 SKU of the HP ZBook Ultra G1a 14.
>>>>>>>>
>>>>>>>> I cannot for the life of me get the webcam working under Linux. The webcam works
>>>>>>>> under Windows so it's not a hardware issue.
>>>>>>>>
>>>>>>>> With this patchset and all of the patches you link here applied to 6.15, I get
>>>>>>>> the following errors:
>>>>>>>> [ 11.970038] amd_isp_i2c_designware amd_isp_i2c_designware: Unknown Synopsys component type: 0xffffffff
>>>>>>>> [ 11.973162] amd_isp_i2c_designware amd_isp_i2c_designware: error -19: i2c_dw_probe failed
>>>>>>>>
>>>>>>>> With the old ispkernel code from February [1] applied on 6.15, the webcam
>>>>>>>> indicator LED lights up but there's no image. I see these messages at boot:
>>>>>>>> [ 9.449005] amd_isp_capture amd_isp_capture.1.auto: amdgpu: AMD ISP v4l2 device registered
>>>>>>>> [ 9.489005] amd_isp_i2c_designware amd_isp_i2c_designware.2.auto: The OV05 sensor device is added to the ISP I2C bus
>>>>>>>> [ 9.529012] amd_isp_i2c_designware amd_isp_i2c_designware.2.auto: timeout while trying to abort current transfer
>>>>>>>> [ 9.554046] amd_isp_i2c_designware amd_isp_i2c_designware.2.auto: timeout in disabling adapter
>>>>>>>> [ 9.554174] amd_isp_i2c_designware amd_isp_i2c_designware.2.auto: timeout while trying to abort current transfer
>>>>>>>> [ 9.580022] amd_isp_i2c_designware amd_isp_i2c_designware.2.auto: timeout in disabling adapter
>>>>>>>>
>>>>>>>> And then the kernel crashes due to the same use-after-free issues I pointed out
>>>>>>>> in my other email [2].
>>>>>>>>
>>>>>>>> Any idea what's going on?
>>>>>>>>
>>>>>>>> [1] https://github.com/amd/Linux_ISP_Kernel/commit/c6d42584fbd0aa42cc91ecf16dc5c4f3dfea0bb4
>>>>>>>> [2] https://lore.kernel.org/r/aIEiJL83pOYO8lUJ@sultan-box
>>>>>>> Hi Sultan,
>>>>>>>
>>>>>>> [1] is for kernel 6.8, believe it can't be applied to 6.15. We didn't verify
>>>>>>> on 6.15 but we are really glad to help, would you please provide some info,
>>>>>>> 1. Suppose you are using Ubuntu, right? What's the version?
>>>>>>> 2. 6.15, do you mean https://github.com/torvalds/linux/tree/v6.15 ?
>>>>>>>
>>>>>>> After your confirmation, we'll see what we can do to enable your camera
>>>>>>> quickly and easily
>>>>>>>
>>>>>>> Regards,
>>>>>>> Bin
>>>>>>
>>>>>> Thank you, Bin!
>>>>>>
>>>>>> 1. I'm using Arch Linux with the ISP4-patched libcamera [1].
>>>>>> 2. Yes, here is my kernel source [2].
>>>>>>
>>>>>> I have some more findings:
>>>>>>
>>>>>> Currently, the first blocking issue is that the I2C adapter fails to initialize.
>>>>>> This is because the ISP tile isn't powered on.
>>>>>>
>>>>>> I noticed that in the old version of amd_isp_i2c_designware [3], there were
>>>>>> calls to isp_power_set(), which is available in the old ISP4 sources [4].
>>>>>> Without isp_power_set(), the I2C adapter always fails to initialize for me.
>>>>>>
>>>>>> How is the ISP tile supposed to get powered on in the current ISP4 code?
>>>>>>
>>>>> You are correct, yes, i believe the I2C adapter failure is caused by ISP not
>>>>> being powered up. Currently in latest code, isp_power_set is no longer
>>>>> available, instead, we implemented genPD for ISP in amdgpu
>>>>> https://lore.kernel.org/all/20250618221923.3944751-1-pratap.nirujogi@amd.com/
>>>>> Both amd_isp_i2c and amd_isp_capture are in the power domain and use the
>>>>> standard runtime PM API to do the power control
>>>>
>>>> Thanks for that link, I found it along with another patch on the list to make
>>>> the fwnode work ("drm/amd/amdgpu: Initialize swnode for ISP MFD device").
>>>>
>>>>>> Also, I noticed that the driver init ordering matters between all of the drivers
>>>>>> needed for the ISP4 camera. In particular, amd_isp_i2c_designware and amd_isp4
>>>>>> must be initialized before amd_capture, otherwise amd_capture will fail to find
>>>>>> the fwnode properties for the OV05C10 device attached to the I2C bus.
>>>>>>
>>>>>> But there is no driver init ordering enforced, which also caused some issues for
>>>>>> me until I figured it out. Maybe probe deferral (-EPROBE_DEFER) should be used
>>>>>> to ensure each driver waits for its dependencies to init first?
>>>>>>
>>>>> amd_isp_capture only has dependency on amd_isp4 which is the ACPI platform
>>>>> driver, it is init before amd_isp_catpure.
>>>>> Do you see in your side the amd_capture probe failure caused by failing to
>>>>> read fwnode properties? If that's the case please help to check if amd_isp4
>>>>> is loaded successfully
>>>>
>>>> I got much further now: there aren't any driver initialization errors, but when
>>>> I open the camera, there's no image. The camera LED turns on so it's active.
>>>>
>>>> And then shortly afterwards, amdgpu dies and the entire system freezes.
>>>>
>>>> I've attached my full dmesg, please let me know what you think. Thanks!
>>>
>>> I almost forgot, here is my current kernel tree:
>>> https://github.com/kerneltoast/kernel_x86_laptop/tree/v6.16-sultan-isp4
>>>
>>> Sultan
>>
>> Thanks Sultan, yes, seems much close to the final success. Will have some
>> internal discussion.
>
> I got the webcam working. The same bug happened when I tried Ubuntu's linux-oem
> kernel, which made me think that the issue was firmware.
>
> And indeed, the culprit was a firmware update from February. I bisected
> linux-firmware and found the commit which broke the webcam for me:
>
> commit 1cc8c1bfa11251ce8bfcc97d1f15e312f7fe4df0 (HEAD)
> Author: Pratap Nirujogi <pratap.nirujogi@amd.com>
> Date: Wed Feb 19 12:16:51 2025 -0500
>
> amdgpu: Update ISP FW for isp v4.1.1
>
> From internal git commit:
> 5058202443e08a673b6772ea6339efb50853be28
>
> Signed-off-by: Pratap Nirujogi <pratap.nirujogi@amd.com>
>
> amdgpu/isp_4_1_1.bin | Bin 4543184 -> 6083536 bytes
> 1 file changed, 0 insertions(+), 0 deletions(-)
>
> Downgrading firmware to before that commit fixes the webcam. Any idea why?
>
> Thanks,
> Sultan

So, can i say the working firmware binary is this one?

Commit 8f070131
amdgpu: Update ISP FW for isp v4.1.1

From internal git commit:
39b007366cc76ef8c65e3bc6220ccb213f4861fb

Signed-off-by: Pratap Nirujogi <pratap.nirujogi@amd.com>

There are too many changes between them, so i can't tell exactly which
change caused this. So, from my side
1. Will try these two firmware to see if we have the same issue.
2. It has been quite a long time since last release, will see if need to
release a latest one.

Regards,
Bin