Re: [PATCH v2 22/25] drm/mediatek: adjust ddp clock control flow

[CK Hu <ck.hu@mediatek.com>]

Hi, Yongqiang:

On Tue, 2019-04-16 at 16:24 +0800, CK Hu wrote:
> Hi, Yongqiang:
> 
> On Wed, 2019-03-27 at 14:19 +0800, yongqiang.niu@mediatek.com wrote:
> > From: Yongqiang Niu <yongqiang.niu@mediatek.com>
> > 
> > display hardware clock will not unprepare when
> > crtc is disable, until crtc is destroyed.
> > with this patch, hard clock will disable and unprepare
> > at the same time.
> 
> Reviewed-by: CK Hu <ck.hu@mediatek.com>

This patch looks independent, so I've applied it to
mediatek-drm-fixes-5.2 [1], thanks.

[1]
https://github.com/ckhu-mediatek/linux.git-tags/commits/mediatek-drm-fixes-5.2

Regards,
CK
> 
> > 
> > Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 26 ++++++--------------------
> >  1 file changed, 6 insertions(+), 20 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > index 0f97ee3..606c6e2 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > @@ -195,7 +195,7 @@ static int mtk_crtc_ddp_clk_enable(struct mtk_drm_crtc *mtk_crtc)
> >  
> >  	DRM_DEBUG_DRIVER("%s\n", __func__);
> >  	for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) {
> > -		ret = clk_enable(mtk_crtc->ddp_comp[i]->clk);
> > +		ret = clk_prepare_enable(mtk_crtc->ddp_comp[i]->clk);
> >  		if (ret) {
> >  			DRM_ERROR("Failed to enable clock %d: %d\n", i, ret);
> >  			goto err;
> > @@ -205,7 +205,7 @@ static int mtk_crtc_ddp_clk_enable(struct mtk_drm_crtc *mtk_crtc)
> >  	return 0;
> >  err:
> >  	while (--i >= 0)
> > -		clk_disable(mtk_crtc->ddp_comp[i]->clk);
> > +		clk_disable_unprepare(mtk_crtc->ddp_comp[i]->clk);
> >  	return ret;
> >  }
> >  
> > @@ -215,7 +215,7 @@ static void mtk_crtc_ddp_clk_disable(struct mtk_drm_crtc *mtk_crtc)
> >  
> >  	DRM_DEBUG_DRIVER("%s\n", __func__);
> >  	for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
> > -		clk_disable(mtk_crtc->ddp_comp[i]->clk);
> > +		clk_disable_unprepare(mtk_crtc->ddp_comp[i]->clk);
> >  }
> >  
> >  static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
> > @@ -615,15 +615,7 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
> >  		if (!comp) {
> >  			dev_err(dev, "Component %pOF not initialized\n", node);
> >  			ret = -ENODEV;
> > -			goto unprepare;
> > -		}
> > -
> > -		ret = clk_prepare(comp->clk);
> > -		if (ret) {
> > -			dev_err(dev,
> > -				"Failed to prepare clock for component %pOF: %d\n",
> > -				node, ret);
> > -			goto unprepare;
> > +			return ret;
> >  		}
> >  
> >  		mtk_crtc->ddp_comp[i] = comp;
> > @@ -649,23 +641,17 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
> >  		ret = mtk_plane_init(drm_dev, &mtk_crtc->planes[zpos],
> >  				     BIT(pipe), type);
> >  		if (ret)
> > -			goto unprepare;
> > +			return ret;
> >  	}
> >  
> >  	ret = mtk_drm_crtc_init(drm_dev, mtk_crtc, &mtk_crtc->planes[0],
> >  				mtk_crtc->layer_nr > 1 ? &mtk_crtc->planes[1] :
> >  				NULL, pipe);
> >  	if (ret < 0)
> > -		goto unprepare;
> > +		return ret;
> >  	drm_mode_crtc_set_gamma_size(&mtk_crtc->base, MTK_LUT_SIZE);
> >  	drm_crtc_enable_color_mgmt(&mtk_crtc->base, 0, false, MTK_LUT_SIZE);
> >  	priv->num_pipes++;
> >  
> >  	return 0;
> > -
> > -unprepare:
> > -	while (--i >= 0)
> > -		clk_unprepare(mtk_crtc->ddp_comp[i]->clk);
> > -
> > -	return ret;
> >  }
> 


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