Re: [PATCH v5 3/3] arm64: dts: qcom: sm8750: Add GPU clock & IOMMU nodes

[Taniya Das]

On 3/10/2026 7:02 PM, Konrad Dybcio wrote:
> On 3/9/26 11:27 AM, Pengyu Luo wrote:
>> On Thu, Mar 5, 2026 6:40 PM Taniya Das <taniya.das@xxxxxxxxxxxxxxxx> wrote:
>>> From: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
>>>
>>> Add the GPU_CC and GX_CC (brand new! as far as we're concerned, this
>>> is simply a separate block housing the GX GDSC) nodes, required to
>>> power up the graphics-related hardware.
>>>
>>> Make use of it by enabling the associated IOMMU as well. The GPU itself
>>> needs some more work and will be enabled later.
>>>
>>> Reviewed-by: Abel Vesa <abel.vesa@xxxxxxxxxxxxxxxx>
>>> Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
>>> Co-developed-by: Taniya Das <taniya.das@xxxxxxxxxxxxxxxx>
>>> Signed-off-by: Taniya Das <taniya.das@xxxxxxxxxxxxxxxx>
>>> ---
>>>
>>
>> Hi Taniya and Konrad, GX GDSC stuck at 'on' on my device
>> the raw register values are
>>
>> 0x3d68024: 0x00000000
>> 0x3d68028: 0x00000000
> 
> These likely indicate that some clock or voltage rail is not accessible
> at the very moment you're reading them back
> 
> GPU support for 8750 is not yet upstream (and A830 is somewhat different
> vs the supported A840) - there may be something wrong in that sequence.
> 
> I heard it's in the works though, so you may be better off waiting a bit.
> 

I am checking internally if any required clock is getting turned off and
causing this.

-- 
Thanks,
Taniya Das