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Message-ID: <0d35d7b6e0677b6eb1118c5a180229bfbdc77e7b.camel@mediatek.com>
Date: Tue, 21 Jun 2022 14:02:30 +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 v12 13/14] drm/mediatek: dpi: Only enable dpi after the
bridge is enabled
On Tue, 2022-06-21 at 11:18 +0800, CK Hu wrote:
> Hi, Bo-Chen:
>
> On Mon, 2022-06-20 at 20:10 +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.
> >
> > Fixes: f89c696e7f63 ("drm/mediatek: mtk_dpi: Convert to bridge
> > driver")
>
> I think this problem happen in the first patch [1].
>
> [1]
>
https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/commit/drivers/gpu/drm/mediatek/mtk_dpi.c?h=mediatek-drm-next&id=9e629c17aa8d7a75b8c1d99ed42892cd8ba7cdc4
>
> Regards,
> CK
>
ok, I will fix this.
BRs,
Bo-Chen
> > 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 fc76ccad0a82..220e9b18e2cd 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > @@ -486,7 +486,6 @@ 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:
> > @@ -731,6 +730,7 @@ 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
>
>
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