linux-kernel - Re: [PATCH 1/9] drm/msm/dp: Add DP support to combo instance in SC7280

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Message-ID: <CAA8EJpotx0PiJ6geGUerOihnH3v5a=cm4ngpHsU1aKDOYtoAeg@mail.gmail.com>
Date: Thu, 22 Feb 2024 06:01:39 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Bjorn Andersson <quic_bjorande@...cinc.com>
Cc: Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, cros-qcom-dts-watchers@...omium.org, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/9] drm/msm/dp: Add DP support to combo instance in SC7280

On Thu, 22 Feb 2024 at 05:47, Bjorn Andersson <quic_bjorande@...cinc.com> wrote:
>
> On Thu, Feb 22, 2024 at 01:38:45AM +0200, Dmitry Baryshkov wrote:
> > On Thu, 22 Feb 2024 at 01:19, Bjorn Andersson <quic_bjorande@...cinc.com> wrote:
> > >
> > > When upstreamed the SC7280 DP controllers where described as one being
> > > DP and one eDP, but they can infact both be DP or eDP.
> > >
> > > Extend the list of DP controllers to cover both instances, and rely on
> > > the newly introduced mechanism for selecting which mode they should
> > > operate in.
> > >
> > > Move qcom,sc7280-edp to a dedicated list, to ensure existing DeviceTree
> > > will continue to select eDP.
> > >
> > > Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> > > ---
> > >  drivers/gpu/drm/msm/dp/dp_display.c | 9 +++++++--
> > >  1 file changed, 7 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> > > index 7b8c695d521a..1792ba9f7259 100644
> > > --- a/drivers/gpu/drm/msm/dp/dp_display.c
> > > +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> > > @@ -129,7 +129,12 @@ static const struct msm_dp_desc sc7180_dp_descs[] = {
> > >  };
> > >
> > >  static const struct msm_dp_desc sc7280_dp_descs[] = {
> > > -       { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
> > > +       { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .wide_bus_en = true },
> > > +       { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_1, .wide_bus_en = true },
> >
> > I think we need to keep .connector_type here, don't we?
> >
>
> No, Abel removes the need for that in his patches - and while that logic
> is slightly broken in the RFC I think it looks good.

Let's see v2 first.

>
> Regards,
> Bjorn
>
> > > +       {}
> > > +};
> > > +
> > > +static const struct msm_dp_desc sc7280_edp_descs[] = {
> > >         { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
> > >         {}
> > >  };
> > > @@ -182,7 +187,7 @@ static const struct msm_dp_desc x1e80100_dp_descs[] = {
> > >  static const struct of_device_id dp_dt_match[] = {
> > >         { .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_descs },
> > >         { .compatible = "qcom,sc7280-dp", .data = &sc7280_dp_descs },
> > > -       { .compatible = "qcom,sc7280-edp", .data = &sc7280_dp_descs },
> > > +       { .compatible = "qcom,sc7280-edp", .data = &sc7280_edp_descs },
> > >         { .compatible = "qcom,sc8180x-dp", .data = &sc8180x_dp_descs },
> > >         { .compatible = "qcom,sc8180x-edp", .data = &sc8180x_dp_descs },
> > >         { .compatible = "qcom,sc8280xp-dp", .data = &sc8280xp_dp_descs },
> > >
> > > --
> > > 2.25.1
> > >
> >
> >
> > --
> > With best wishes
> > Dmitry



-- 
With best wishes
Dmitry