backlight probe failure triggers blank display after power on
We had a report in the matrix channels that after power one the device would start booting but the display would stay blank. I've seen this on my development device here too now more than once (it's more likely to show that as this is booted way more often than daily device):
# cat /sys/kernel/debug/devices_deferred
backlight-dsi platform: wait for supplier /soc@0/bus@30800000/i2c@30a40000/backlight@36/led@0
30a00000.mipi-dsi.0 mipi-dsi: supplier backlight-dsi not ready
2-0038
30320000.lcd-controller mxsfb: Cannot connect bridge
triggered by a timeout of the backlight driver to read on i2c:
[ 0.921367] lm3692x 2-0036: Cannot read/clear faults: -110
[ 0.926880] lm3692x 2-0036: Fail writing initialization values
[ 0.933098] lm3692x: probe of 2-0036 failed with error -110
Full dmesg: dmesg