linux-kernel - Re: [PATCH 3/3] drm/msm/dp: Clean up pdev/dev duplication in dp

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Date:   Sat, 20 May 2023 22:53:56 -0500
From:   Bjorn Andersson <andersson@...nel.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Bjorn Andersson <quic_bjorande@...cinc.com>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Johan Hovold <johan+linaro@...nel.org>,
        Vinod Polimera <quic_vpolimer@...cinc.com>,
        Sankeerth Billakanti <quic_sbillaka@...cinc.com>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org
Subject: Re: [PATCH 3/3] drm/msm/dp: Clean up pdev/dev duplication in dp_power

On Sat, May 20, 2023 at 04:26:59AM +0300, Dmitry Baryshkov wrote:
> On 15/05/2023 06:02, Bjorn Andersson wrote:
> > The dp_power module keeps track of both the DP controller's struct
> > platform_device and struct device - with the prior pulled out of the
> > dp_parser module.
> > 
> > Clean up the duplication by dropping the platform_device reference and
> > just track the passed struct device.
> > 
> > Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> > ---
> >   drivers/gpu/drm/msm/dp/dp_power.c | 16 +++++++---------
> >   1 file changed, 7 insertions(+), 9 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/msm/dp/dp_power.c b/drivers/gpu/drm/msm/dp/dp_power.c
> > index 031d2eefef07..9be645f91211 100644
> > --- a/drivers/gpu/drm/msm/dp/dp_power.c
> > +++ b/drivers/gpu/drm/msm/dp/dp_power.c
> > @@ -14,7 +14,6 @@
> >   struct dp_power_private {
> >   	struct dp_parser *parser;
> > -	struct platform_device *pdev;
> >   	struct device *dev;
> >   	struct drm_device *drm_dev;
> >   	struct clk *link_clk_src;
> > @@ -28,7 +27,7 @@ static int dp_power_clk_init(struct dp_power_private *power)
> >   {
> >   	int rc = 0;
> >   	struct dss_module_power *core, *ctrl, *stream;
> > -	struct device *dev = &power->pdev->dev;
> > +	struct device *dev = power->dev;
> >   	core = &power->parser->mp[DP_CORE_PM];
> >   	ctrl = &power->parser->mp[DP_CTRL_PM];
> > @@ -153,7 +152,7 @@ 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->pdev->dev);
> > +	pm_runtime_enable(power->dev);
> >   	return dp_power_clk_init(power);
> >   }
> > @@ -164,7 +163,7 @@ void dp_power_client_deinit(struct dp_power *dp_power)
> >   	power = container_of(dp_power, struct dp_power_private, dp_power);
> > -	pm_runtime_disable(&power->pdev->dev);
> > +	pm_runtime_disable(power->dev);
> >   }
> >   int dp_power_init(struct dp_power *dp_power, bool flip)
> > @@ -174,11 +173,11 @@ int dp_power_init(struct dp_power *dp_power, bool flip)
> >   	power = container_of(dp_power, struct dp_power_private, dp_power);
> > -	pm_runtime_get_sync(&power->pdev->dev);
> > +	pm_runtime_get_sync(power->dev);
> >   	rc = dp_power_clk_enable(dp_power, DP_CORE_PM, true);
> >   	if (rc)
> > -		pm_runtime_put_sync(&power->pdev->dev);
> > +		pm_runtime_put_sync(power->dev);
> >   	return rc;
> >   }
> > @@ -190,7 +189,7 @@ 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->pdev->dev);
> > +	pm_runtime_put_sync(power->dev);
> >   	return 0;
> >   }
> > @@ -199,12 +198,11 @@ struct dp_power *dp_power_get(struct device *dev, struct dp_parser *parser)
> 
> Technically we don't even need to pass struct device here, we can get it
> from parser->pdev->dev.
> 

Right, but afaict dp_init_sub_modules() passes struct device * as first
parameter to all the "module" initializers. So it feels reasonable to
keep it, for now, for symmetry.

What do you think?

Regards,
Bjorn

> >   	struct dp_power_private *power;
> >   	struct dp_power *dp_power;
> > -	power = devm_kzalloc(&parser->pdev->dev, sizeof(*power), GFP_KERNEL);
> > +	power = devm_kzalloc(dev, sizeof(*power), GFP_KERNEL);
> >   	if (!power)
> >   		return ERR_PTR(-ENOMEM);
> >   	power->parser = parser;
> > -	power->pdev = parser->pdev;
> >   	power->dev = dev;
> >   	dp_power = &power->dp_power;
> 
> -- 
> With best wishes
> Dmitry
>