linux-kernel - Re: [Freedreno] [PATCH v1 1/5] drm/msm/dp: remove pm_runtime_xxx() from dp

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Message-ID: <8a8b24ea-1abf-922c-439e-50a27cf2e5fa@quicinc.com>
Date:   Mon, 10 Jul 2023 10:25:14 -0700
From:   Kuogee Hsieh <quic_khsieh@...cinc.com>
To:     Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC:     <dri-devel@...ts.freedesktop.org>, <robdclark@...il.com>,
        <sean@...rly.run>, <swboyd@...omium.org>, <dianders@...omium.org>,
        <vkoul@...nel.org>, <daniel@...ll.ch>, <airlied@...il.com>,
        <agross@...nel.org>, <andersson@...nel.org>,
        <quic_sbillaka@...cinc.com>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <marijn.suijten@...ainline.org>,
        <quic_jesszhan@...cinc.com>, <freedreno@...ts.freedesktop.org>
Subject: Re: [Freedreno] [PATCH v1 1/5] drm/msm/dp: remove pm_runtime_xxx()
 from dp_power.c


On 7/9/2023 1:32 PM, Abhinav Kumar wrote:
>
>
> On 7/9/2023 11:00 AM, Dmitry Baryshkov wrote:
>> On Sun, 9 Jul 2023 at 20:22, Abhinav Kumar 
>> <quic_abhinavk@...cinc.com> wrote:
>>>
>>>
>>>
>>> On 7/7/2023 5:06 PM, Dmitry Baryshkov wrote:
>>>> On 08/07/2023 02:52, Kuogee Hsieh wrote:
>>>>> Since both pm_runtime_resume() and pm_runtime_suspend() are not
>>>>> populated at dp_pm_ops. Those pm_runtime_get/put() functions within
>>>>> dp_power.c will not have any effects in addition to increase/decrease
>>>>> power counter.
>>>>
>>>> Lie.
>>>>
>>>
>>> Even if the commit text is incorrect, review comments like this are not
>>> helping the patch nor the author and will just get ignored anyway.
>>
>> The review comment might be overreacting, excuse me. I was really
>> impressed by the commit message, which contradicts the basic source
>> code. pm_runtime_get() does a lot more than just increasing the power
>> counter.
>>
>
> It says within dp_power.c. Nonetheless, please let us know what is 
> missing in the context of this patch like Bjorn did to make it an 
> effective review and we can correct it. In its current form, the 
> review comment is adding no value.
>
I am new in pm.

Any recommendation to revise this commit test?

>>>>> Also pm_runtime_xxx() should be executed at top
>>>>> layer.
>>>>
>>>> Why?
>>>>
>>>
>>> I guess he meant to centralize this around dp_display.c. Will elaborate
>>> while posting the next rev.
>>>
>>>>>
>>>>> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
>>>>> ---
>>>>>    drivers/gpu/drm/msm/dp/dp_power.c | 9 ---------
>>>>>    1 file changed, 9 deletions(-)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/msm/dp/dp_power.c
>>>>> b/drivers/gpu/drm/msm/dp/dp_power.c
>>>>> index 5cb84ca..ed2f62a 100644
>>>>> --- a/drivers/gpu/drm/msm/dp/dp_power.c
>>>>> +++ b/drivers/gpu/drm/msm/dp/dp_power.c
>>>>> @@ -152,8 +152,6 @@ int dp_power_client_init(struct dp_power 
>>>>> *dp_power)
>>>>>        power = container_of(dp_power, struct dp_power_private, 
>>>>> dp_power);
>>>>> -    pm_runtime_enable(power->dev);
>>>>> -
>>>>>        return dp_power_clk_init(power);
>>>>>    }
>>>>> @@ -162,8 +160,6 @@ void dp_power_client_deinit(struct dp_power
>>>>> *dp_power)
>>>>>        struct dp_power_private *power;
>>>>>        power = container_of(dp_power, struct dp_power_private, 
>>>>> dp_power);
>>>>> -
>>>>> -    pm_runtime_disable(power->dev);
>>>>>    }
>>>>>    int dp_power_init(struct dp_power *dp_power)
>>>>> @@ -173,11 +169,7 @@ int dp_power_init(struct dp_power *dp_power)
>>>>>        power = container_of(dp_power, struct dp_power_private, 
>>>>> dp_power);
>>>>> -    pm_runtime_get_sync(power->dev);
>>>>> -
>>>>>        rc = dp_power_clk_enable(dp_power, DP_CORE_PM, true);
>>>>> -    if (rc)
>>>>> -        pm_runtime_put_sync(power->dev);
>>>>>        return rc;
>>>>>    }
>>>>> @@ -189,7 +181,6 @@ int dp_power_deinit(struct dp_power *dp_power)
>>>>>        power = container_of(dp_power, struct dp_power_private, 
>>>>> dp_power);
>>>>>        dp_power_clk_enable(dp_power, DP_CORE_PM, false);
>>>>> -    pm_runtime_put_sync(power->dev);
>>>>>        return 0;
>>>>>    }
>>>>
>>
>>
>>