[PATCH v3 0/6] arm64: qcom: allow up to 4 lanes for the Type-C DisplayPort Altmode

[Jens Glathe]

On 27.05.25 22:40, Konrad Dybcio wrote:
> The DisplayPort 4 lanes setup can be check with:
> $ cat /sys/kernel/debug/dri/ae01000.display-controller/DP-1/dp_debug
> 	name = msm_dp
> 	drm_dp_link
> 		rate = 540000
> 		num_lanes = 4
> ...

Hi Konrad,

thank you for the patch. I applied it, added `mode-switch;` to all combo 
qmpphys in sc8280xp.dtsi, enabled 4 lanes on the mdss_dp's, and it works 
on the windows Dev Kit 2023 (Blackrock) on usb1, with both orientations. 
Getting 4k at 60 with 4 lanes. DPMS suspend/wakeup works, too. usb0 does 
only data, as before (need to investigate).

My suggestion would be to put the `mode-switch;` into the SoC dtsi 
(sc8280xp and x1e80100, maybe more?). Shouldn't hurt IMO.

Tested-by: Jens Glathe <jens.glathe at oldschoolsolutions.biz>

with best regards

Jens