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

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Date: Wed, 21 Feb 2024 19:47:27 -0800
From: Bjorn Andersson <quic_bjorande@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
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, 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.

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