HDMI HPD issue for L4T r36.3

[gdwang]

Hi，

Our device based on ORIN has an issue with HDMI hot plug on JP6.0GA.

If the HDMI display is not connected before powering up the device, there’s no display output after it powers up. However, if the HDMI display is connected before powering up, the login screen appears once power-up is completed.

We found a similar topic on JP6.0DP previously:

HDMI HPD doesn't work in L4T r36.2

Hi all, We made a custom carrier board. There is only one hdmi interface. I added changes below to enable hdmi function but hpd didn’t work. Added os_gpio_hotplug_a in display node. display@13800000 { os_gpio_hotplug_a = <&gpio TEGRA234_MAIN_GPIO(M, 0) GPIO_ACTIVE_HIGH>; }; Added tegra234-dcb-p3767-0000-hdmi.dtbo and change the pinmux and pmc config in flash config. PINMUX_CONFIG="tegra234-mb1-bct-pinmux-p3767-hdmi-a03.dtsi"; PMC_CONFIG="tegra234-mb1-bct-padvoltage-p3767-hdmi-…

Has this issue been resolved on JP6.0GA?

[WayneWWW]

Yes, such problem has been fixed in GA.

If you still have hotplug issue on your side, then it is something else. Probably some missing configuration.

[gdwang]

Hi WayneWWW,

Could you help to check if the configurations below are right, or what else is missing?

1. bootloader/tegra234-firewall-config-base.dtsi

        reg@322 { /* GPIO_CTL, GPIO_M_SCR_00_0 */
            exclusion-info = <2>;
            value = <0x38009696>;
        };

2. bootloader/generic/BCT/tegra234-mb1-bct-pinmux-p3701-0000-a04.dtsi

                        dp_aux_ch0_hpd_pm0 {
                                nvidia,pins = "dp_aux_ch0_hpd_pm0";
                                nvidia,function = "rsvd1"; 
                                nvidia,pull = <TEGRA_PIN_PULL_NONE>;
                                nvidia,tristate = <TEGRA_PIN_ENABLE>;
                                nvidia,enable-input = <TEGRA_PIN_ENABLE>;
                                nvidia,io-high-voltage = <TEGRA_PIN_DISABLE>;
                                nvidia,lpdr = <TEGRA_PIN_DISABLE>;
                        };

3. tegra234-p3737-0000+p3701-xxxx-nv-common.dtsi

        display@13800000 {
                os_gpio_hotplug_a = <&gpio TEGRA234_MAIN_GPIO(M, 0) GPIO_ACTIVE_HIGH>;
                status = "okay";
        };

[WayneWWW]

        reg@322 { /* GPIO_CTL, GPIO_M_SCR_00_0 */
            exclusion-info = <2>;
            value = <0x38009696>;
        };

This is not needed.

Actually you could just refer to p3509 config.

[gdwang]

Got it. Thanks a lot!