Add support for playing audio over USB DisplayPort (the two left USB-C
ports on the CRD device).

Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

---

Answering comments:
1. No clue about third port. I do not have a reliable working CRD
   device, so I cannot test it. I add what I tested.

2. Topology and Alsa UCM were merged long time ago, so btw without this
   patch CRD is negativelly affected or even broken (ALSA tries to
   configure non-existing DAI links)...

Can finally this be applied after a year?

Changes since v2:
1. Rebase - sound-name-prefix are now part of DTSI.
v2: https://patch.msgid.link/20250624122933.54776-2-krzysztof.kozlowski@linaro.org

Changes since v1:
1. Rebase (x1-crd.dtsi appeared)
2. Re-order cpu/codec
3. Add blank line before status for mdss_dp
4. Tags
---
 arch/arm64/boot/dts/qcom/x1-crd.dtsi | 36 ++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/x1-crd.dtsi b/arch/arm64/boot/dts/qcom/x1-crd.dtsi
index ded96fb43489..9e43b48496f2 100644
--- a/arch/arm64/boot/dts/qcom/x1-crd.dtsi
+++ b/arch/arm64/boot/dts/qcom/x1-crd.dtsi
@@ -226,6 +226,38 @@ sound {
 				"VA DMIC3", "MIC BIAS1",
 				"TX SWR_INPUT1", "ADC2_OUTPUT";
 
+		displayport-0-dai-link {
+			link-name = "DisplayPort0 Playback";
+
+			codec {
+				sound-dai = <&mdss_dp0>;
+			};
+
+			cpu {
+				sound-dai = <&q6apmbedai DISPLAY_PORT_RX_0>;
+			};
+
+			platform {
+				sound-dai = <&q6apm>;
+			};
+		};
+
+		displayport-1-dai-link {
+			link-name = "DisplayPort1 Playback";
+
+			codec {
+				sound-dai = <&mdss_dp1>;
+			};
+
+			cpu {
+				sound-dai = <&q6apmbedai DISPLAY_PORT_RX_1>;
+			};
+
+			platform {
+				sound-dai = <&q6apm>;
+			};
+		};
+
 		wcd-playback-dai-link {
 			link-name = "WCD Playback";
 
@@ -1152,6 +1184,8 @@ &mdss {
 };
 
 &mdss_dp0 {
+	sound-name-prefix = "DisplayPort0";
+
 	status = "okay";
 };
 
@@ -1160,6 +1194,8 @@ &mdss_dp0_out {
 };
 
 &mdss_dp1 {
+	sound-name-prefix = "DisplayPort1";
+
 	status = "okay";
 };
 
-- 
2.51.0

On 09/02/2026 10:26, Krzysztof Kozlowski wrote:
> Add support for playing audio over USB DisplayPort (the two left USB-C
> ports on the CRD device).
> 
> Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
> 
> ---
> 
> Answering comments:
> 1. No clue about third port. I do not have a reliable working CRD
>    device, so I cannot test it. I add what I tested.
> 
> 2. Topology and Alsa UCM were merged long time ago, so btw without this
>    patch CRD is negativelly affected or even broken (ALSA tries to
>    configure non-existing DAI links)...
> 
> Can finally this be applied after a year?
> 
> Changes since v2:
> 1. Rebase - sound-name-prefix are now part of DTSI.

And this part did not happen, so v4 is coming :(


Best regards,
Krzysztof