Hi there,
We have designed a custom carrier board based on the Xavier NX Carrier Board P3509. The HDMI output section features a 1:4 splitter, the PI3HDX414FCEEX, which implements a Pin control and I2C control mode. For some reason we need the HDMI splitter to be in Pin control mode which disables the DDC lines (grounded).
There is no output on the screen when using the Orin NX, it works fine with a Xavier NX module.
Is there a possibility to bypass/disable the DDC channel and force the output on the HDMI lines to the screen? Or hardcode the display information in the BSP?
Thanks for your responses.
Upon hotplugging the HDMI, here is the warning that repeats in the kernel logs:
[ 277.751952] WARNING: CPU: 0 PID: 0 at drivers/gpio/gpio-tegra186.c:937 tegra186_gpio_irq+0x1a0
[ 277.761364] Modules linked in: fuse(E) lzo_rle(E) lzo_compress(E) zram(E) ramoops(E) reed_sol)
[ 277.761464] nvidia(OE) nv_imx219(E) spi_tegra114(E) cfg80211(E) realtek(E) ina3221(E) pwm_fa]
[ 277.761488] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W OE 5.10.104-tegra #1
[ 277.761491] Hardware name: Unknown NVIDIA Orin NX Developer Kit/NVIDIA Orin NX Developer Kit,3
[ 277.761494] pstate: 20400089 (nzCv daIf +PAN -UAO -TCO BTYPE=--)
[ 277.761498] pc : tegra186_gpio_irq+0x1ac/0x1f0
[ 277.761502] lr : tegra186_gpio_irq+0x11c/0x1f0
[ 277.761504] sp : ffff800010003c60
[ 277.761507] x29: ffff800010003c60 x28: ffff556840e33660
[ 277.761513] x27: ffffd5154724cff8 x26: 0000000000000018
[ 277.761519] x25: ffff556845a75880 x24: ffff556845a9f000
[ 277.761524] x23: 000000000000000c x22: 000000000000004c
[ 277.761530] x21: 00000000000000bb x20: 0000000000000000
[ 277.761536] x19: ffffd5154670e690 x18: 0000000000000000
[ 277.761542] x17: 0000000000000000 x16: 0000000000000000
[ 277.761548] x15: 0000000000000000 x14: ffffd51547132680
[ 277.761553] x13: ffff805627e2e000 x12: 000000003464d91d
[ 277.761559] x11: 0000000000000040 x10: ffffd515471b7a80
[ 277.761565] x9 : ffffd515471b7a78 x8 : ffff5568404b6938
[ 277.761571] x7 : 0000000000000000 x6 : 0000000000000001
[ 277.761577] x5 : 0000000000000000 x4 : 0000000000000000
[ 277.761582] x3 : 0000000000000000 x2 : ffffd515455ee170
[ 277.761589] x1 : 000000000000004c x0 : 0000000000000000
[ 277.761594] Call trace:
[ 277.761598] tegra186_gpio_irq+0x1ac/0x1f0
[ 277.761603] generic_handle_irq+0x40/0x60
[ 277.761608] __handle_domain_irq+0x70/0xd0
[ 277.761612] gic_handle_irq+0x68/0x134
[ 277.761615] el1_irq+0xd0/0x180
[ 277.761618] __do_softirq+0xb4/0x3e8
[ 277.761623] irq_exit+0xc0/0xe0
[ 277.761628] __handle_domain_irq+0x74/0xd0
[ 277.761631] gic_handle_irq+0x68/0x134
[ 277.761634] el1_irq+0xd0/0x180
[ 277.761638] cpuidle_enter_state+0xb8/0x410
[ 277.761642] cpuidle_enter+0x40/0x60
[ 277.761645] call_cpuidle+0x44/0x80
[ 277.761649] do_idle+0x208/0x270
[ 277.761652] cpu_startup_entry+0x2c/0x70
[ 277.761657] rest_init+0xdc/0xe8
[ 277.761660] arch_call_rest_init+0x18/0x20
[ 277.761663] start_kernel+0x514/0x54c
[ 277.761666] ---[ end trace 5a0705e81b55b67b ]---