When we developed USB function done,HDMI output continued on/off

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
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1

In the original source code, we can booting and HDMI output is OK. Our design is no PD controller , so we modify the code to meet TYPE-A USB 3.0. USB is work fine, but now HDMI output is abnormal. In nVIDIA logo screen is fine, when running some time ,the hdmi output start to on/off . attachment is log file .

[ 334.378290] tegradc 15200000.nvdisplay: blank - powerdown
[ 334.416238] extcon-disp-state external-connection:disp-state: cable 48 state 0
[ 334.416241] Extcon AUX2(HDMI) disable
[ 334.450547] tegra_nvdisp_handle_pd_disable: Powergated Head1 pd
[ 334.453349] tegra_nvdisp_handle_pd_disable: Powergated Head0 pd
[ 334.454231] tegradc 15200000.nvdisplay: unblank
[ 334.460007] tegra_nvdisp_handle_pd_enable: Unpowergated Head0 pd
[ 334.460540] tegra_nvdisp_handle_pd_enable: Unpowergated Head1 pd
[ 334.481333] Parent Clock set for DC plld3
[ 334.487222] tegradc 15200000.nvdisplay: hdmi: tmds rate:148500K prod-setting:prod_c_hdmi_111m_223m
[ 334.489042] tegradc 15200000.nvdisplay: hdmi: get RGB quant from EDID.
[ 334.489054] tegradc 15200000.nvdisplay: hdmi: get YCC quant from EDID.
[ 334.525416] extcon-disp-state external-connection:disp-state: cable 48 state 1
[ 334.525427] Extcon AUX2(HDMI) enable
[ 337.869470] tegradc 15200000.nvdisplay: blank - powerdown
[ 337.906064] extcon-disp-state external-connection:disp-state: cable 48 state 0
[ 337.906121] Extcon AUX2(HDMI) disable
[ 337.938945] tegra_nvdisp_handle_pd_disable: Powergated Head1 pd
[ 337.940961] tegra_nvdisp_handle_pd_disable: Powergated Head0 pd
[ 337.941284] tegradc 15200000.nvdisplay: unblank
[ 337.965162] tegra_nvdisp_handle_pd_enable: Unpowergated Head0 pd
[ 337.965577] tegra_nvdisp_handle_pd_enable: Unpowergated Head1 pd
[ 337.985561] Parent Clock set for DC plld3
[ 337.991063] tegradc 15200000.nvdisplay: hdmi: tmds rate:148500K prod-setting:prod_c_hdmi_111m_223m
[ 337.992646] tegradc 15200000.nvdisplay: hdmi: get RGB quant from EDID.
[ 337.992657] tegradc 15200000.nvdisplay: hdmi: get YCC quant from EDID.
[ 338.030791] extcon-disp-state external-connection:disp-state: cable 48 state 1
[ 338.030804] Extcon AUX2(HDMI) enable
log.log (145.5 KB)

3

Have you ever changed the device tree or just use the original one from jetpack?

4

Hi Wayne
Thank you for your reply.
We use Jetpack 4.4DP and just modify USB device tree for USB TYPE-A function .
thanks

5

Please remove “nvidia,typec-port” in sor in tegra194-p2888-0001-p2822-0000-common.dtsi.

6

Hi WayneWWW
SW engineer re-download the SDK and follow the steps to regenerate the root file system, now it’s normal working . thanks