Re: [PATCH v2 4/6] clk: qcom: Use HW_CTRL_TRIGGER flag to switch video GDSC to HW mode

[Konrad Dybcio]

On 28.08.2023 08:48, Jagadeesh Kona wrote:
> 
> 
> On 8/26/2023 4:17 PM, Konrad Dybcio wrote:
>> On 23.08.2023 12:41, Abel Vesa wrote:
>>> On 23-08-16 19:56:46, Konrad Dybcio wrote:
>>>> On 16.08.2023 16:57, Abel Vesa wrote:
>>>>> From: Jagadeesh Kona <quic_jkona@xxxxxxxxxxx>
>>>>>
>>>>> The current HW_CTRL flag switches the video GDSC to HW control mode as
>>>>> part of GDSC enable itself, instead of that use HW_CTRL_TRIGGER flag to
>>>>> give consumer drivers more control and switch the GDSC mode as and when
>>>>> required.
>>>>>
>>>>> HW_CTRL_TRIGGER flag allows consumer drivers to switch the video GDSC to
>>>>> HW/SW control modes at runtime using dev_pm_genpd_set_hwmode API.
>>>>>
>>>>> Signed-off-by: Jagadeesh Kona <quic_jkona@xxxxxxxxxxx>
>>>>> Signed-off-by: Abel Vesa <abel.vesa@xxxxxxxxxx>
>>>>> ---
>>>> Do we have any use for the HW_CTRL flag?
>>>>
>>>> Perhaps it should be renamed to HW_CTRL_ALWAYS?
>>>>
>>>> Or even better, *if and only if* that is necessary, add a common
>>>> property like "always_hw_managed" to the genpd code?
>>>
>>> The HW_CTRL flag is still needed for the consumers that expect the GDSC
>>> to be have the HW control bit set right after it gets enabled.
>> Guess the correct question here would be.. Are there any?
>>
> 
> Yes, Display GDSC(mdss_gdsc) is required to be controlled always in HW control mode when it is enabled.
Oh really?

Looking at msm-5.10 techpack, only the SDE RSC driver seems to
trigger regulator fast mode (so, enabling gdsc hw_ctrl on downstream).

Konrad