DSI MIPI panel backlight is on, but displays nothing

[chengp]

Hey all,

I am trying to integrate a DSI MIPI LCD panel to Jetson TX2 4GB.

I modified display-timing in panel-s-wuxga-8-0.dtsi, added dsi node in tegra186-quill-p3489-0888-a00-00-base.dts and enable it under nvdisplay@15200000. After flashing, there are errors for vpp_lcd/vmm_lcd regluators and reset gpio, so I disabled them in driver code.

With all these modifications above, the bcacklight of the panel is on, but nothing is shown…

Messages from “dmesg | grep nvdisplay”:
root@nvidia-desktop:/sys/devices# dmesg | grep nvdisplay
[ 0.430787] iommu: Adding device 15200000.nvdisplay to group 33
[ 0.991915] tegradc 15200000.nvdisplay: disp0 connected to head0->/host1x/dsi
[ 0.992045] tegradc 15200000.nvdisplay: No hpd-gpio in DT
[ 0.992075] tegradc 15200000.nvdisplay: DT parsed successfully
[ 0.992133] tegradc 15200000.nvdisplay: Display dc.ffffff800b650000 registered with id=0
[ 1.000623] tegradc 15200000.nvdisplay: vblank syncpt # 8 for dc 0
[ 1.000628] tegradc 15200000.nvdisplay: vpulse3 syncpt # 9 for dc 0
[ 1.006068] tegradc 15200000.nvdisplay: probed
[ 1.007174] tegradc 15200000.nvdisplay: fb registered
[ 1.042427] tegradc 15200000.nvdisplay: DSI: HS clock rate is 435500
[ 5.543662] tegradc 15200000.nvdisplay: blank - powerdown
[ 9.361856] tegradc 15200000.nvdisplay: blank - powerdown
[ 9.361867] tegradc 15200000.nvdisplay: unblank
[ 10.112224] tegradc 15200000.nvdisplay: sync windows ret = 246
[ 10.116009] tegradc 15200000.nvdisplay: unblank
[ 325.969991] tegradc 15200000.nvdisplay: blank - powerdown

Does anyone know how can I fix this problem? Thanks in advance.

[WayneWWW]

Please attache full dmesg

[chengp]

@WayneWWW Thanks for your reply!

The full dmesg is here: dmesg_jetson_tx2_4gb (60.4 KB)

The display reset gpio error is still there, but I commented goto fail, so it would not cause driver failure. Also, I know the mmc1 errors are from pinmux settings, but they don’t affect anything so far, so I just leave them here. Are they related to the DSI LCD issue?

Thanks!

[WayneWWW]

There is no error log from the display driver.

Maybe you can go do the driver code and dump the info and see if they match your panel.