linux-kernel - Re: [PATCH v2] clk: qcom: gcc-sc8280xp: Allow PCIe GDSCs to enter retention state

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Date:   Thu, 6 Jul 2023 16:40:42 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Johan Hovold <johan@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     andersson@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
        johan+linaro@...nel.org, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] clk: qcom: gcc-sc8280xp: Allow PCIe GDSCs to enter
 retention state

On 6.07.2023 16:17, Johan Hovold wrote:
> On Thu, Jul 06, 2023 at 07:38:42PM +0530, Manivannan Sadhasivam wrote:
>> With the minimal system suspend support in place for the PCIe driver that
>> keeps the interconnect path voted, the ALWAYS_ON flag can now be dropped.
>>
>> Also, the PWRSTS_RET_ON flag should be used to allow the GDSCs to enter the
>> retention state when the parent domain get's turned off during system
>> suspend.
>>
>> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
>> ---
>>
>> Changes in v2:
>>
>> * Changed the patch from simple revert to changing the ALWAYS_ON flag to
>>   PWRSTS_RET_ON.
>>
>>  drivers/clk/qcom/gcc-sc8280xp.c | 10 +++++-----
>>  1 file changed, 5 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/clk/qcom/gcc-sc8280xp.c b/drivers/clk/qcom/gcc-sc8280xp.c
>> index 04a99dbaa57e..c59b0f91c87d 100644
>> --- a/drivers/clk/qcom/gcc-sc8280xp.c
>> +++ b/drivers/clk/qcom/gcc-sc8280xp.c
>> @@ -6786,7 +6786,7 @@ static struct gdsc pcie_2a_gdsc = {
>>  		.name = "pcie_2a_gdsc",
>>  	},
>>  	.pwrsts = PWRSTS_OFF_ON,
>> -	.flags = VOTABLE | ALWAYS_ON,
>> +	.flags = VOTABLE | PWRSTS_RET_ON,
>>  };
> 
> This is not correct either. PWRSTS_RET_ON is a pwrsts mask...
This + please rebase atop that:

https://lore.kernel.org/linux-arm-msm/20230620-topic-sc8280_gccgdsc-v2-0-562c1428c10d@linaro.org/

Konrad
> 
> Johan