[Letux-kernel] no interrupts from touchscreen

Andreas Kemnade andreas at kemnade.info
Mon Aug 20 20:05:34 CEST 2018


at the moment I do not get interrupts from touchscreen.
I am working with 4.17. It seems to have stopped working after suspend.
This happens randomly, seen it with different kernels. At this time I have
a working usb connection and investigated.
via iio I could read out x/y and pressure. They seem to behave same.
Pressure can go up to > 1000

But I do not get interrupts.
Nothing happens in /proc/interrupts.

GPS jack irq works, so gpio irqs are not totally messed up.

Some values:
root at gta04:~# devmem2 0x4905804C w
/dev/mem opened.
Memory mapped at address 0xb6f0d000.
Value at address 0x4905804C (0xb6f0d04c): 0x1
root at gta04:~# devmem2 0x4905801C w
/dev/mem opened.
Memory mapped at address 0xb6f07000.
Value at address 0x4905801C (0xb6f0701c): 0x1

This stays the same regards if I touch or not
root at gta04:~# devmem2 0x49058038 w
/dev/mem opened.
Memory mapped at address 0xb6f4b000.
Value at address 0x49058038 (0xb6f4b038): 0xB001

# devmem2 0x48002194  w
/dev/mem opened.
Memory mapped at address 0xb6faa000.
Value at address 0x48002194 (0xb6faa194): 0x100011C

root at gta04:~# devmem2 0x49058034 w
/dev/mem opened.
Memory mapped at address 0xb6f77000.
Value at address 0x49058034 (0xb6f77034): 0xFBFFBFFF

Any hints? reboot doen not help.
Power cycle helps.

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