[PATCH RFT 7/7] arm64: dts: qcom-mode-switch: allow 4 lanes for DisplayPort and enable QMP PHY mode-switch

[Bjorn Andersson]

On Thu, Feb 29, 2024 at 02:07:07PM +0100, Neil Armstrong wrote:
> Allow up to 4 lanes for the DisplayPort link from the PHYs to the Controllers
> and allow mode-switch events to the QMP Combo PHYs.
> 

Please adjust $subject and commit message to suite the x13s.dts...


With this series I'm reaching 4k at 60 on my X13s (with some difficulty due
to current hotplug issues in the DP driver) - but 4-lane DP works, and
so does 2-lane combo.

I tested switching between DP-only and a USB device, this worked fine a
few (3-4) times, after which the USB device stopped showing up. The DP
display continued to work nicely and the debug prints from the driver
indicates that we're moving back and forth between the modes...

The problems I had when trying to implement this previously, with the
device crashing on disconnect have not been seen, across 20+
attempts.

Regards,
Bjorn

> Signed-off-by: Neil Armstrong <neil.armstrong at linaro.org>
> ---
>  arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> index a0fdef55a40a..6c73e0fc001f 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> @@ -556,7 +556,7 @@ &mdss0_dp0 {
>  };
>  
>  &mdss0_dp0_out {
> -	data-lanes = <0 1>;
> +	data-lanes = <0 1 2 3>;
>  	remote-endpoint = <&usb_0_qmpphy_dp_in>;
>  };
>  
> @@ -565,7 +565,7 @@ &mdss0_dp1 {
>  };
>  
>  &mdss0_dp1_out {
> -	data-lanes = <0 1>;
> +	data-lanes = <0 1 2 3>;
>  	remote-endpoint = <&usb_1_qmpphy_dp_in>;
>  };
>  
> @@ -1112,6 +1112,7 @@ &usb_0_qmpphy {
>  	vdda-phy-supply = <&vreg_l9d>;
>  	vdda-pll-supply = <&vreg_l4d>;
>  
> +	mode-switch;
>  	orientation-switch;
>  
>  	status = "okay";
> @@ -1149,6 +1150,7 @@ &usb_1_qmpphy {
>  	vdda-phy-supply = <&vreg_l4b>;
>  	vdda-pll-supply = <&vreg_l3b>;
>  
> +	mode-switch;
>  	orientation-switch;
>  
>  	status = "okay";
> 
> -- 
> 2.34.1
>