[PATCH] arm64: dts: qcom: qcs6490-rb3gen2: Enable 4-lane DisplayPort Alt Mode

Mahadevan P
2026-04-20T10:00:14Z

Add the mode-switch property to the QMP combo PHY so that mode-switch
events are routed to it, allowing the PHY to enter DisplayPort Alternate
Mode. Expand the DP data-lanes assignment from two to four lanes to make
use of the full link bandwidth available in this configuration.

Signed-off-by: Mahadevan P <mahadevan.p@oss.qualcomm.com>
---
arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
index e393ccf1884a..0c180e49816f 100644
--- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
+++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
@@ -789,7 +789,7 @@ &mdss_dp {
};

&mdss_dp_out {
- data-lanes = <0 1>;
+ data-lanes = <0 1 2 3>;
remote-endpoint = <&usb_dp_qmpphy_dp_in>;
};

@@ -1391,6 +1391,7 @@ &usb_1_qmpphy {
vdda-phy-supply = <&vreg_l6b_1p2>;
vdda-pll-supply = <&vreg_l1b_0p912>;

+ mode-switch;
orientation-switch;

status = "okay";

---
base-commit: 452c3b1ea875276105ac90ba474f72b4cd9b77a2
change-id: 20260417-kodiak_4k-891ef2221e4b

Best regards,
--
Mahadevan P <mahadevan.p@oss.qualcomm.com>