linux-kernel - Re: [PATCH v11 11/12] drm/mediatek: dpi: Only enable dpi after the bridge is enabled

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Date:   Thu, 16 Jun 2022 18:49:07 +0800
From:   Rex-BC Chen <rex-bc.chen@...iatek.com>
To:     CK Hu <ck.hu@...iatek.com>, <chunkuang.hu@...nel.org>,
        <p.zabel@...gutronix.de>, <daniel@...ll.ch>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <matthias.bgg@...il.com>,
        <airlied@...ux.ie>
CC:     <msp@...libre.com>, <granquet@...libre.com>,
        <jitao.shi@...iatek.com>, <wenst@...omium.org>,
        <angelogioacchino.delregno@...labora.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v11 11/12] drm/mediatek: dpi: Only enable dpi after the
 bridge is enabled

On Tue, 2022-06-14 at 14:24 +0800, CK Hu wrote:
> Hi, Bo-Chen:
> 
> On Mon, 2022-06-13 at 14:48 +0800, Bo-Chen Chen wrote:
> > From: Guillaume Ranquet <granquet@...libre.com>
> > 
> > Enabling the dpi too early causes glitches on screen.
> > 
> > Move the call to mtk_dpi_enable() at the end of the bridge_enable
> > callback to ensure everything is setup properly before enabling
> > dpi.
> 
> This seems a bug fix, so add Fixes tag on this patch.
> 
> Regards,
> CK
> 

ok, I will do this using this patch:
f89c696e7f635487481eee0d196ab49730ce8664

> > 
> > Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> > Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_dpi.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > index 08c8f21b4421..9668bd5dd14a 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > @@ -480,7 +480,6 @@ static int mtk_dpi_power_on(struct mtk_dpi
> > *dpi)
> >  	if (dpi->pinctrl && dpi->pins_dpi)
> >  		pinctrl_select_state(dpi->pinctrl, dpi->pins_dpi);
> >  
> > -	mtk_dpi_enable(dpi);
> >  	return 0;
> >  
> >  err_pixel:
> > @@ -726,6 +725,7 @@ static void mtk_dpi_bridge_enable(struct
> > drm_bridge *bridge)
> >  
> >  	mtk_dpi_power_on(dpi);
> >  	mtk_dpi_set_display_mode(dpi, &dpi->mode);
> > +	mtk_dpi_enable(dpi);
> >  }
> >  
> >  static enum drm_mode_status
> 
>