Re: [PATCH v2 13/15] drm/mediatek: use layer_nr function to get layer number to init plane

From: Stu Hsieh <stu.hsieh@mediatek.com>
To: CK Hu <ck.hu@mediatek.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>,
	David Airlie <airlied@linux.ie>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	<dri-devel@lists.freedesktop.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-mediatek@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>, <srv_heupstream@mediatek.com>
Subject: Re: [PATCH v2 13/15] drm/mediatek: use layer_nr function to get layer number to init plane
Date: Mon, 6 Aug 2018 19:55:45 +0800	[thread overview]
Message-ID: <1533556545.11190.72.camel@mtksdccf07> (raw)
In-Reply-To: <1533274405.31144.16.camel@mtksdaap41>

Hi, CK:
On Fri, 2018-08-03 at 13:33 +0800, CK Hu wrote:
> Hi, Stu:
> 
> On Fri, 2018-08-03 at 11:11 +0800, Stu Hsieh wrote:
> > This patch use layer_nr function to get layer number to init plane
> > 
> > When plane init in crtc create,
> > it use the number of OVL layer to init plane.
> > That's OVL can read 4 memory address.
> > 
> > For mt2712 third ddp, it use RDMA to read memory.
> > RDMA can read 1 memory address, so it just init one plane.
> > 
> > For compatibility, this patch use mtk_ddp_comp_layer_nr function
> > to get layer number from their HW component in ddp for plane init.
> > 
> > Signed-off-by: Stu Hsieh <stu.hsieh@mediatek.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 26 ++++++++++++++++++--------
> >  drivers/gpu/drm/mediatek/mtk_drm_crtc.h |  2 +-
> >  2 files changed, 19 insertions(+), 9 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > index 4bf636e466f2..b4d3dfca4003 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > @@ -45,7 +45,8 @@ struct mtk_drm_crtc {
> >  	bool				pending_needs_vblank;
> >  	struct drm_pending_vblank_event	*event;
> >  
> > -	struct drm_plane		planes[OVL_LAYER_NR];
> > +	struct drm_plane		planes[MAX_LAYER_NR];
> 
> For the RDMA crtc, there is only one plane but here allocate 4 planes. I
> would like the array size is depend on layer_nr to prevent wasting
> memory.
> 
OK

> > +	unsigned int			layer_nr;
> >  	bool				pending_planes;
> >  
> >  	void __iomem			*config_regs;
> > @@ -286,7 +287,7 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
> >  	}
> >  
> >  	/* Initially configure all planes */
> > -	for (i = 0; i < OVL_LAYER_NR; i++) {
> > +	for (i = 0; i < mtk_crtc->layer_nr; i++) {
> >  		struct drm_plane *plane = &mtk_crtc->planes[i];
> >  		struct mtk_plane_state *plane_state;
> >  
> > @@ -351,7 +352,7 @@ static void mtk_crtc_ddp_config(struct drm_crtc *crtc)
> >  	}
> >  
> >  	if (mtk_crtc->pending_planes) {
> > -		for (i = 0; i < OVL_LAYER_NR; i++) {
> > +		for (i = 0; i < mtk_crtc->layer_nr; i++) {
> >  			struct drm_plane *plane = &mtk_crtc->planes[i];
> >  			struct mtk_plane_state *plane_state;
> >  
> > @@ -403,7 +404,7 @@ static void mtk_drm_crtc_atomic_disable(struct drm_crtc *crtc,
> >  		return;
> >  
> >  	/* Set all pending plane state to disabled */
> > -	for (i = 0; i < OVL_LAYER_NR; i++) {
> > +	for (i = 0; i < mtk_crtc->layer_nr; i++) {
> >  		struct drm_plane *plane = &mtk_crtc->planes[i];
> >  		struct mtk_plane_state *plane_state;
> >  
> > @@ -450,7 +451,7 @@ static void mtk_drm_crtc_atomic_flush(struct drm_crtc *crtc,
> >  
> >  	if (mtk_crtc->event)
> >  		mtk_crtc->pending_needs_vblank = true;
> > -	for (i = 0; i < OVL_LAYER_NR; i++) {
> > +	for (i = 0; i < mtk_crtc->layer_nr; i++) {
> >  		struct drm_plane *plane = &mtk_crtc->planes[i];
> >  		struct mtk_plane_state *plane_state;
> >  
> > @@ -596,6 +597,9 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
> >  			goto unprepare;
> >  		}
> >  
> > +		if (i == 0)
> > +			mtk_crtc->layer_nr = mtk_ddp_comp_layer_nr(comp);
> > +
> >  		if (i == 0 && (comp_id == DDP_COMPONENT_RDMA0 ||
> >  			       comp_id == DDP_COMPONENT_RDMA1 ||
> >  			       comp_id == DDP_COMPONENT_RDMA2)) {
> > @@ -606,7 +610,7 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
> >  		mtk_crtc->ddp_comp[i] = comp;
> >  	}
> >  
> > -	for (zpos = 0; zpos < OVL_LAYER_NR; zpos++) {
> > +	for (zpos = 0; zpos < mtk_crtc->layer_nr; zpos++) {
> >  		type = (zpos == 0) ? DRM_PLANE_TYPE_PRIMARY :
> >  				(zpos == 1) ? DRM_PLANE_TYPE_CURSOR :
> >  						DRM_PLANE_TYPE_OVERLAY;
> > @@ -616,8 +620,14 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
> >  			goto unprepare;
> >  	}
> >  
> > -	ret = mtk_drm_crtc_init(drm_dev, mtk_crtc, &mtk_crtc->planes[0],
> > -				&mtk_crtc->planes[1], pipe);
> > +	if (mtk_crtc->layer_nr == 1) {
> > +		ret = mtk_drm_crtc_init(drm_dev, mtk_crtc, &mtk_crtc->planes[0],
> > +					NULL, pipe);
> > +	} else {
> > +		ret = mtk_drm_crtc_init(drm_dev, mtk_crtc, &mtk_crtc->planes[0],
> > +					&mtk_crtc->planes[1], pipe);
> > +	}
> 
> You could write as
> 
> ret = mtk_drm_crtc_init(drm_dev, mtk_crtc, &mtk_crtc->planes[0],
> 			mtk_crtc->layer_nr > 1 ? &mtk_crtc->planes[1] : NULL, pipe);
> 
> Regards,
> CK
> 
OK

Regards,
Stu
> > +
> >  	if (ret < 0)
> >  		goto unprepare;
> >  	drm_mode_crtc_set_gamma_size(&mtk_crtc->base, MTK_LUT_SIZE);
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> > index 9d9410c67ae9..0399321b1414 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> > @@ -18,7 +18,7 @@
> >  #include "mtk_drm_ddp_comp.h"
> >  #include "mtk_drm_plane.h"
> >  
> > -#define OVL_LAYER_NR	4
> > +#define MAX_LAYER_NR	4
> >  #define MTK_LUT_SIZE	512
> >  #define MTK_MAX_BPC	10
> >  #define MTK_MIN_BPC	3
> 
>