linux-kernel - Re: [PATCH 4/5] drm/msm/dp: Try looking for link-frequencies into the port@0's endpoint first

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Date: Wed, 31 Jan 2024 19:04:12 +0200
From: Abel Vesa <abel.vesa@...aro.org>
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>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] drm/msm/dp: Try looking for link-frequencies into
 the port@0's endpoint first

On 24-01-29 17:08:29, Dmitry Baryshkov wrote:
> On Mon, 29 Jan 2024 at 15:19, Abel Vesa <abel.vesa@...aro.org> wrote:
> >
> > From: Abhinav Kumar <quic_abhinavk@...cinc.com>
> >
> > On platforms where the endpoint used is on port@0, looking for port@1
> > instead results in just ignoring the max link-frequencies altogether.
> > Look at port@0 first, then, if not found, look for port@1.
> 
> NAK. Platforms do not "use port@0". It is for the connection between
> DPU and DP, while the link-frequencies property is for the link
> between DP controller and the actual display.

I messed up. This patch is not needed, plus the author is wrong.

Will drop in the next version.

Sorry about that.

> 
> >
> > Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
> > Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> > ---
> >  drivers/gpu/drm/msm/dp/dp_parser.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c
> > index 7032dcc8842b..eec5b8b83f4b 100644
> > --- a/drivers/gpu/drm/msm/dp/dp_parser.c
> > +++ b/drivers/gpu/drm/msm/dp/dp_parser.c
> > @@ -97,7 +97,11 @@ static u32 dp_parser_link_frequencies(struct device_node *of_node)
> >         u64 frequency = 0;
> >         int cnt;
> >
> > -       endpoint = of_graph_get_endpoint_by_regs(of_node, 1, 0); /* port@1 */
> > +       endpoint = of_graph_get_endpoint_by_regs(of_node, 0, 0); /* port@0 */
> > +
> > +       if (!endpoint)
> > +               endpoint = of_graph_get_endpoint_by_regs(of_node, 1, 0); /* port@1 */
> > +
> >         if (!endpoint)
> >                 return 0;
> >
> >
> > --
> > 2.34.1
> >
> 
> 
> -- 
> With best wishes
> Dmitry