linux-kernel - Re: [PATCH v1 07/17] drm/mediatek: add OVL support for MT8195

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Date:   Sat, 10 Jul 2021 15:05:12 +0800
From:   Jason-JH Lin <jason-jh.lin@...iatek.com>
To:     CK Hu <ck.hu@...iatek.com>
CC:     <chunkuang.hu@...nel.org>, <matthias.bgg@...il.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        <fshao@...gle.com>, <nancy.lin@...iatek.com>,
        <singo.chang@...iatek.com>
Subject: Re: [PATCH v1 07/17] drm/mediatek: add OVL support for MT8195

On Wed, 2021-07-07 at 13:03 +0800, CK Hu wrote:
> Hi, Jason:
> 
> On Wed, 2021-07-07 at 12:12 +0800, jason-jh.lin wrote:
> > Add OVL support for MT8195.
> > 
> > Signed-off-by: jason-jh.lin <jason-jh.lin@...iatek.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 9 +++++++++
> >  drivers/gpu/drm/mediatek/mtk_drm_drv.c  | 2 ++
> >  2 files changed, 11 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > index 961f87f8d4d1..99c39487026d 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > @@ -455,6 +455,13 @@ static const struct mtk_disp_ovl_data
> > mt8183_ovl_2l_driver_data = {
> >  	.fmt_rgb565_is_0 = true,
> >  };
> >  
> > +static const struct mtk_disp_ovl_data mt8195_ovl_driver_data = {
> > +	.addr = DISP_REG_OVL_ADDR_MT8173,
> > +	.gmc_bits = 10,
> > +	.layer_nr = 4,
> > +	.fmt_rgb565_is_0 = true,
> > +};
> 
> mt8195_ovl_driver_data is identical to mt8183_ovl_driver_data, so
> remove
> mt8195_ovl_driver_data and use mt8183_ovl_driver_data.
> 
> > +
> >  static const struct of_device_id mtk_disp_ovl_driver_dt_match[] =
> > {
> >  	{ .compatible = "mediatek,mt2701-disp-ovl",
> >  	  .data = &mt2701_ovl_driver_data},
> > @@ -464,6 +471,8 @@ static const struct of_device_id
> > mtk_disp_ovl_driver_dt_match[] = {
> >  	  .data = &mt8183_ovl_driver_data},
> >  	{ .compatible = "mediatek,mt8183-disp-ovl-2l",
> >  	  .data = &mt8183_ovl_2l_driver_data},
> > +	{ .compatible = "mediatek,mt8195-disp-ovl",
> > +	  .data = &mt8195_ovl_driver_data},
> 
> One question, is mediatek,mt8195-disp-ovl identical to
> mediatek,mt8183-disp-ovl in hardware function? If so, use the
> compatible
> as
> 
> compatible = "mediatek,mt8195-disp-ovl", "mediatek,mt8183-disp-ovl";
> 
> And driver just keep "mediatek,mt8183-disp-ovl" and remove
> "mediatek,mt8195-disp-ovl".
> 
> If the hardware function has some different, just forget this.
> 
> Regards,
> CK
> 
Hi CK,

OK, I'll remove this patch at the next version.

Regard,
Jason-JH.Lin
> >  	{},
> >  };
> >  MODULE_DEVICE_TABLE(of, mtk_disp_ovl_driver_dt_match);
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> > b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> > index 5b7ead493487..65038d5b19cb 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> > @@ -424,6 +424,8 @@ static const struct of_device_id
> > mtk_ddp_comp_dt_ids[] = {
> >  	  .data = (void *)MTK_DISP_OVL },
> >  	{ .compatible = "mediatek,mt8183-disp-ovl",
> >  	  .data = (void *)MTK_DISP_OVL },
> > +	{ .compatible = "mediatek,mt8195-disp-ovl",
> > +	  .data = (void *)MTK_DISP_OVL },
> >  	{ .compatible = "mediatek,mt8183-disp-ovl-2l",
> >  	  .data = (void *)MTK_DISP_OVL_2L },
> >  	{ .compatible = "mediatek,mt2701-disp-rdma",
> 
>