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

[Konrad Dybcio]

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.

Konrad