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

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Date:   Sun, 9 Jul 2023 13:32:01 -0700
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC:     Kuogee Hsieh <quic_khsieh@...cinc.com>,
        <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 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.

>>>> 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;
>>>>    }
>>>
> 
> 
>