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

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Date:   Sat, 8 Jul 2023 03:06:12 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     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
Cc:     quic_abhinavk@...cinc.com, quic_jesszhan@...cinc.com,
        quic_sbillaka@...cinc.com, marijn.suijten@...ainline.org,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/5] drm/msm/dp: remove pm_runtime_xxx() from
 dp_power.c

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.

> Also pm_runtime_xxx() should be executed at top
> layer.

Why?

> 
> 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;
>   }
>   

-- 
With best wishes
Dmitry