Re: [PATCH v2 4/7] drm/msm/dpu: Change _dpu_crtc_power_enable to void

[Sean Paul <sean-p7yTbzM4H96eqtR555YLDQ@public.gmane.org>]

On Thu, Sep 20, 2018 at 11:36:34AM -0600, Jordan Crouse wrote:
> On Thu, Sep 20, 2018 at 12:49:21PM -0400, Bruce Wang wrote:
> > All checks for _dpu_crtc_power_enable are not true, so the function
> > can never return an error code. All calls of the function have also
> > been changed so that they don't expect a return value.
> > 
> > Signed-off-by: Bruce Wang <bzwang@chromium.org>
> > ---
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 35 ++++--------------------
> >  1 file changed, 5 insertions(+), 30 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > index a9adb16eac6f..648d77c41c3e 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > @@ -59,37 +59,16 @@ static inline struct dpu_kms *_dpu_crtc_get_kms(struct drm_crtc *crtc)
> >  			->kms);
> >  }
> >  
> > -static inline int _dpu_crtc_power_enable(struct dpu_crtc *dpu_crtc, bool enable)
> > +static inline void _dpu_crtc_power_enable(struct dpu_crtc *dpu_crtc, bool enable)
> 
> Since this is only two lines of code with the optimization below my personal
> preference would be to turn this into two functions: _dpu_crtc_power_enable and
> _dpu_crtc_power_disable. I find that to be more readable when walking through
> the functional code.

...or just call the pm_runtime functions directly? If we can use
_dpu_crtc_get_kms() it shouldn't be too nasty.

Sean

> 
> >  {
> > -	struct drm_crtc *crtc;
> > -	struct msm_drm_private *priv;
> > -	struct dpu_kms *dpu_kms;
> > -
> > -	if (!dpu_crtc) {
> > -		DPU_ERROR("invalid dpu crtc\n");
> > -		return -EINVAL;
> > -	}
> > -
> > -	crtc = &dpu_crtc->base;
> > -	if (!crtc->dev || !crtc->dev->dev_private) {
> > -		DPU_ERROR("invalid drm device\n");
> > -		return -EINVAL;
> > -	}
> > -
> > -	priv = crtc->dev->dev_private;
> > -	if (!priv->kms) {
> > -		DPU_ERROR("invalid kms\n");
> > -		return -EINVAL;
> > -	}
> > -
> > -	dpu_kms = to_dpu_kms(priv->kms);
> > +	struct drm_crtc *crtc = &dpu_crtc->base;
> > +	struct msm_drm_private *priv = crtc->dev->dev_private;
> > +	struct dpu_kms *dpu_kms = to_dpu_kms(priv->kms);
> 
> I think all three of these can be replaced by
> 
> struct dpu_kms *dpu_kms = _dpu_crtc_get_kms(&dpu_crtc->base);
> 
> >  	if (enable)
> >  		pm_runtime_get_sync(&dpu_kms->pdev->dev);
> >  	else
> >  		pm_runtime_put_sync(&dpu_kms->pdev->dev);
> > -
> > -	return 0;
> >  }
> >  
> >  static void dpu_crtc_destroy(struct drm_crtc *crtc)
> > @@ -822,14 +801,10 @@ static int _dpu_crtc_vblank_enable_no_lock(
> >  	dev = crtc->dev;
> >  
> >  	if (enable) {
> > -		int ret;
> > -
> >  		/* drop lock since power crtc cb may try to re-acquire lock */
> >  		mutex_unlock(&dpu_crtc->crtc_lock);
> > -		ret = _dpu_crtc_power_enable(dpu_crtc, true);
> > +		_dpu_crtc_power_enable(dpu_crtc, true);
> >  		mutex_lock(&dpu_crtc->crtc_lock);
> > -		if (ret)
> > -			return ret;
> >  
> >  		list_for_each_entry(enc, &dev->mode_config.encoder_list, head) {
> >  			if (enc->crtc != crtc)
> > -- 
> > 2.19.0.444.g18242da7ef-goog
> > 
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> 
> -- 
> The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> a Linux Foundation Collaborative Project

-- 
Sean Paul, Software Engineer, Google / Chromium OS
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