Dual display: HDMI + DP

[WayneWWW]

Hi @WayneWWW, I have tried your reply, I modified the three files you mentioned:

• arch/arm64/boot/dts/tegra210-jetson-cv-base-p2597-2180-a00.dts
• arch/arm64/boot/dts/tegra210-platforms/tegra210-ers-dp-e2220-1170-a00.dtsi
• arch/arm64/boot/dts/tegra210-platforms/tegra210-jetson-cv-power-tree-p2597-2180-a00.dtsi

The result is HDMI works fine and DP does not work, nothing output from DP.

Besides these three dts/dtsi files, is there any other changes should be made to implement this dual display?

And in your reply Line 65 nvidia,sor1-output-type = “dp”;
, is this right? I think sor0 is for DP, and sor1 is for HDMI. My hardware connections are as follows:

HDMI ports:

• A33 --- HPD
• A34 --- SDA
• A35 --- SCL
• B33 --- CEC
• E35 --- CK-
• E36 --- CK+
• D36 --- D0-
• D37 --- D0+
• C37 --- D1-
• C38 --- D1+
• E38 --- D2-
• E39 --- D2+

DP ports:

• B36 --- HPD
• B35 --- AUX CH+
• B34 --- AUX CH-
• H36 --- D3+
• H35 --- D3-
• G37 --- D2+
• G36 --- D2-
• F38 --- D1+
• F37 --- D1-
• H39 --- D0+
• H38 --- D0-

Hi ShayWang,

After quick check, the “sor1-output-type” does not influence the actual sor that dp is using.

You can take a look at board-panel.c. The function “tegra_seconrday_panel_get_dt_node” is where we check the secondary panel and it is usually SOR1 that dp is attached. As a result, “sor1-output-type” is just a string used to find dp. It does not imply you are using SOR1 with dp.