Re: [PATCH] arm64: dts: qcom: sc8280xp-huawei-gaokun3: Add dsi panel DT node

[Konrad Dybcio]

On 6/30/26 12:30 PM, Pengyu Luo wrote:
> On Tue, Jun 30, 2026 at 6:29 PM Konrad Dybcio
> <konrad.dybcio@xxxxxxxxxxxxxxxx> wrote:
>>
>> On 6/30/26 11:28 AM, Pengyu Luo wrote:
>>> On Tue, Jun 30, 2026 at 5:18 PM Konrad Dybcio
>>> <konrad.dybcio@xxxxxxxxxxxxxxxx> wrote:
>>>>
>>>> On 6/30/26 6:22 AM, Pengyu Luo wrote:
>>>>> DSI panel driver have been added for a while, so add the DT node to
>>>>> enable it. vdd{a,s}-supply for dsi, dsi_phy are blank since the DSDT
>>>>> describes the wrong, no impact after manual disabling these wrong
>>>>> supplies.
>>>>>
>>>>> Signed-off-by: Pengyu Luo <mitltlatltl@xxxxxxxxx>
>>>>> ---
>>>>
>>>> [...]
>>>>
>>>>> +&mdss0_dsi0 {
>>>>> +     /* real vdda is unknown */
>>>>> +
>>>>
>>>> L3B: DSI core 1.2 V (both?)
>>>> L6B: DSI0/1 PLL and core 0.9 V
>>>>
>>>
>>> Yes, that is what I saw in the DSDT, however, I can disable them
>>> safely (hack the regulator driver to add a sysfs to handle these
>>> regulators), the panel works well.
>>
>> L3B additionally powers CSIPHY2/3, EDP0/1, REFGEN (probably why it
>> ends up being on), UFSPHY and USB1_PHY
>>
>> L6B additionally powers the same components, minus refgen and USB
>>
> 
> No, I confirmed they are totally disabled, since there is a way to check it now.
> https://lore.kernel.org/linux-arm-msm/20260420-read-rpmh-v3-v4-0-70c152e6c958@xxxxxxxxxxxxxxxx/

This presents you with the status of the votes casted by HLOS, not
the actual hardware state

To get the latter, you'd have to dump the SPMI registers

Konrad