[Letux-kernel] no interrupts from touchscreen

[H. Nikolaus Schaller]

Hi,

> Am 20.08.2018 um 20:05 schrieb Andreas Kemnade <andreas at kemnade.info>:
> 
> Hi,
> 
> 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.

strange. I have just tested with 4.18.4 on a GTA04A4:

root at letux:~# cat /proc/interrupts |fgrep tsc2007
168:       2369  49058000.gpio   0 Edge      tsc2007
root at letux:~# cat /proc/interrupts |fgrep tsc2007
168:       2369  49058000.gpio   0 Edge      tsc2007
root at letux:~# cat /proc/interrupts |fgrep tsc2007
168:       2369  49058000.gpio   0 Edge      tsc2007
root at letux:~# cat /proc/interrupts |fgrep tsc2007
168:       2383  49058000.gpio   0 Edge      tsc2007
root at letux:~# cat /proc/interrupts |fgrep tsc2007
168:       2383  49058000.gpio   0 Edge      tsc2007
root at letux:~# cat /proc/interrupts |fgrep tsc2007
168:       2397  49058000.gpio   0 Edge      tsc2007
root at letux:~# cat /proc/interrupts |fgrep tsc2007
168:       2408  49058000.gpio   0 Edge      tsc2007
root at letux:~#

> 
> 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 letux:~# /usr/bin/arm-linux-gnueabihf/devmem2 0x4905804C w
/dev/mem opened.
Memory mapped at address 0xb6f4c000.
Value at address 0x4905804C (0xb6f4c04c): 0x1
root at letux:~#

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

root at letux:~# /usr/bin/arm-linux-gnueabihf/devmem2 0x4905801C w
/dev/mem opened.
Memory mapped at address 0xb6efc000.
Value at address 0x4905801C (0xb6efc01c): 0x1
root at letux:~#

> 
> 
> This stays the same regards if I touch or not

same for me

> root at gta04:~# devmem2 0x49058038 w
> /dev/mem opened.
> Memory mapped at address 0xb6f4b000.
> Value at address 0x49058038 (0xb6f4b038): 0xB001

root at letux:~# /usr/bin/arm-linux-gnueabihf/devmem2 0x49058038 w
/dev/mem opened.
Memory mapped at address 0xb6f8d000.
Value at address 0x49058038 (0xb6f8d038): 0xE801
root at letux:~#

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

root at letux:~# /usr/bin/arm-linux-gnueabihf/devmem2 0x48002194  w
/dev/mem opened.
Memory mapped at address 0xb6ff1000.
Value at address 0x48002194 (0xb6ff1194): 0x100011C
root at letux:~#
> 
> root at gta04:~# devmem2 0x49058034 w
> /dev/mem opened.
> Memory mapped at address 0xb6f77000.
> Value at address 0x49058034 (0xb6f77034): 0xFBFFBFFF

root at letux:~# /usr/bin/arm-linux-gnueabihf/devmem2 devmem2 0x49058034 w
/dev/mem opened.
Memory mapped at address 0xb6fd6000.
Illegal data type '0'.
root at letux:~#

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

Maybe you can add some printk to tsc2007.c?

BR,
Nikolaus

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