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

[Dmitry Baryshkov]

On Mon, 29 Jan 2024 at 15:19, Abel Vesa <abel.vesa at linaro.org> wrote:
>
> From: Abhinav Kumar <quic_abhinavk at quicinc.com>
>
> On platforms where the endpoint used is on port at 0, looking for port at 1
> instead results in just ignoring the max link-frequencies altogether.
> Look at port at 0 first, then, if not found, look for port at 1.

NAK. Platforms do not "use port at 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.

>
> Signed-off-by: Abhinav Kumar <quic_abhinavk at quicinc.com>
> Signed-off-by: Abel Vesa <abel.vesa at linaro.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 at 1 */
> +       endpoint = of_graph_get_endpoint_by_regs(of_node, 0, 0); /* port at 0 */
> +
> +       if (!endpoint)
> +               endpoint = of_graph_get_endpoint_by_regs(of_node, 1, 0); /* port at 1 */
> +
>         if (!endpoint)
>                 return 0;
>
>
> --
> 2.34.1
>


-- 
With best wishes
Dmitry