linux-kernel - Re: [PATCH v8 4/8] drm/mediatek: Add encoder_index function to mtk_ddp_comp

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Date:   Sat, 5 Aug 2023 07:40:41 +0000
From:   Jason-JH Lin (林睿祥) 
        <Jason-JH.Lin@...iatek.com>
To:     "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "eugen.hristev@...labora.com" <eugen.hristev@...labora.com>
CC:     "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Singo Chang (張興國) 
        <Singo.Chang@...iatek.com>,
        Johnson Wang (王聖鑫) 
        <Johnson.Wang@...iatek.com>,
        Jason-ch Chen (陳建豪) 
        <Jason-ch.Chen@...iatek.com>,
        Shawn Sung (宋孝謙) 
        <Shawn.Sung@...iatek.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>
Subject: Re: [PATCH v8 4/8] drm/mediatek: Add encoder_index function to
 mtk_ddp_comp_funcs

Hi Eugen,

Thanks for the reviews.

On Thu, 2023-08-03 at 16:27 +0300, Eugen Hristev wrote:
> On 8/2/23 17:47, Jason-JH.Lin wrote:
> > 1. Add encoder_index function to mtk_ddp_comp_funcs to support
> > dynamic
> > connector selection for some ddp_comp who has encoder_index.
> > 2. Add mtk_ddp_comp_encoder_index_set function to set encoder_index
> > to
> > each comp.
> > 
> 
> Usually a commit that does two things in a list is supposed to be
> two 
> actual commits.
> 
OK, I'll move the second part to [PATCH v8 6/8].

> 
> > Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> > ---
> >   drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 8 ++++++++
> >   1 file changed, 8 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> > b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> > index febcaeef16a1..8428baca70f4 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> > @@ -80,6 +80,7 @@ struct mtk_ddp_comp_funcs {
> >   	void (*disconnect)(struct device *dev, struct device
> > *mmsys_dev, unsigned int next);
> >   	void (*add)(struct device *dev, struct mtk_mutex *mutex);
> >   	void (*remove)(struct device *dev, struct mtk_mutex *mutex);
> > +	unsigned int (*encoder_index)(struct device *dev);
> >   };
> >   
> >   struct mtk_ddp_comp {
> > @@ -87,6 +88,7 @@ struct mtk_ddp_comp {
> >   	int irq;
> >   	unsigned int id;
> >   	const struct mtk_ddp_comp_funcs *funcs;
> > +	unsigned int encoder_index;
> 
> For better alignment I would suggest variables to be declared
> together 
> and pointers afterwards, not mixed up
> 

OK, I'll move it between `unsigned int id` and `const struct
mtk_ddp_comp_funcs *funcs`.


> >   };
> >   
> >   static inline int mtk_ddp_comp_clk_enable(struct mtk_ddp_comp
> > *comp)
> > @@ -275,6 +277,12 @@ static inline bool
> > mtk_ddp_comp_disconnect(struct mtk_ddp_comp *comp, struct dev
> >   	return false;
> >   }
> >   
> > +static inline void mtk_ddp_comp_encoder_index_set(struct
> > mtk_ddp_comp *comp)
> > +{
> > +	if (comp->funcs && comp->funcs->encoder_index)
> > +		comp->encoder_index = comp->funcs->encoder_index(comp-
> > >dev);
> > +}
> 
> it's also a bit strange that you added a function that is not used 
> anywhere. Don't you get like a compiler warning for it ?
> 
Because it's used in mtk_drm_crtc_create() in [PATCH v8 6/8].
I'll move this part into [PATCH v8 6/8].

Regards,
Jason-JH.Lin

> > +
> >   int mtk_ddp_comp_get_id(struct device_node *node,
> >   			enum mtk_ddp_comp_type comp_type);
> >   unsigned int mtk_drm_find_possible_crtc_by_comp(struct drm_device
> > *drm,
> 
>