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

From: Abel Vesa
Date: Wed Jan 31 2024 - 12:04:41 EST


On 24-01-29 17:08:29, Dmitry Baryshkov wrote:
> On Mon, 29 Jan 2024 at 15:19, Abel Vesa <abel.vesa@xxxxxxxxxx> wrote:
> >
> > From: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
> >
> > 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@xxxxxxxxxxx>
> > Signed-off-by: Abel Vesa <abel.vesa@xxxxxxxxxx>
> > ---
> > 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