Re: [PATCH] drm/amd/display: Restore 5s vbl offdelay for NV3x+ DGPUs

[Mario Limonciello <mario.limonciello@amd.com>]

On 4/22/26 12:50, Michele Palazzi wrote:
> On 4/22/26 19:42, Mario Limonciello wrote:
>>
>> In Michele's proposal (https://lore.kernel.org/amd- 
>> gfx/20260217191632.1243826-1-sysdadmin@m1k.cloud/) there was a mention 
>> that it was tested on DCN 3.5 too, which made me think that the exact 
>> same issue was on both.
>>
>> Michele - can you readily reproduce the page flip timeout on DCN 3.5?
>>
>> If so; could you modify Leo's patch to drop the IS_APU designation and 
>> see if it happens to be the same solution?
>>
>>>
>>>>
>>>>> +                       /*
>>>>> +                        * DGPUs NV3x and newer that support idle 
>>>>> optimizations
>>>>> +                        * experience intermittent flip-done 
>>>>> timeouts on cursor
>>>>> +                        * updates. Restore 5s offdelay behavior 
>>>>> for now.
>>>>> +                        *
>>>>> +                        * Discussion on the issue:
>>>>> +                        * https://lore.kernel.org/amd- 
>>>>> gfx/20260217191632.1243826-1-sysdadmin@m1k.cloud/
>>>>> +                        */
>>>>> +                       config.offdelay_ms = 5000;
>>>>> +                       config.disable_immediate = false;
>>>>> +               } else if (amdgpu_ip_version(adev, DCE_HWIP, 0) <
>>>>> +                            IP_VERSION(3, 5, 0)) {
>>>>>                          /*
>>>>>                           * Older HW and DGPU have issues with 
>>>>> instant off;
>>>>>                           * use a 2 frame offdelay.
>>>>> -- 
>>>>> 2.53.0
>>>>>
>>>
>>
> 
> Hi Mario, i had tested my proposed patch on multiple APUs in order to 
> exclude regressions or side effects, but personally i only ever 
> encountered this particular issue on dGPUs, specifically a 7900 GRE 
> first and a 9070XT later.
> 

Got it - thanks for clarifying and reaffirming Leo's assertion was 
correct on root cause.

Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>