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onitake / gslx680-acpi

ACPI/x86 compatible driver for Silead GSLx680 touchscreens
GNU General Public License v2.0
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gsl_ts_reset_chip: gsl_ts_write 1 fail! #9

Closed barni2000 closed 8 years ago

barni2000 commented 8 years ago

I have got some new errors: [ 585.405027] gslx680 i2c-MSSL1680:00: gsl_ts_probe: got a device named MSSL1680:00 at address 0x40, IRQ 201, flags 0x0 [ 585.477655] input: Silead GSLx680 Touchscreen as /devices/platform/80860F41:03/i2c-11/i2c-MSSL1680:00/input/input10 [ 585.504702] gslx680 i2c-MSSL1680:00: gsl_ts_reset_chip: gsl_ts_write 1 fail! [ 585.504715] gslx680 i2c-MSSL1680:00: gsl_ts_probe: chip reset failed [ 585.544934] gslx680: probe of i2c-MSSL1680:00 failed with error -121

onitake commented 8 years ago

Yeah, sorry about that. This happens when the chip has not been properly woken up.

I removed the ACPI wakeup procedure and replaced it with GPIO signalling, as I ran into a conflict on my tablet. But there's still something wrong. I'll update you when I get it working again.

onitake commented 8 years ago

Did you close the issue because it's working again or because you can't find a solution?

After some experimentation, I found that the Silead in my tablet does not wake up properly when I just signal the GPIO line. So I added the ACPI method call back in, which manipulates two GPIO pins in a certain sequence. If that doesn't work or ACPI is not available, it uses the GPIO pin instead.

This makes wakeup work again here, but there seems to be a regression in Ubuntu kernel 4.2.0-27, causing it to fail. 4.2.0-25 still works. It looks like a broken DSDT that triggers errors in newer kernels. Too bad there's no BIOS updates for these cheap tablets.