On Mon, Mar 16, 2020 at 03:57:36PM +0100, Oliver Graute wrote: > On 02/03/20, Oliver Graute wrote: > > Hello, > > > > I have on of these FT6336G Touch Panels here and I try to get it work > > with the ft6236 driver. It comes up with model identification "0x11". So > > I added that identification to the switch case in > > edt_ft5x06_ts_identify(). But it crashes directly after the probe with a > > corrupted stack. No clue why. Some ideas? > > I still observe sometimes crashes with ft6236G. When it occurs it is > always a stack corruption in the probe function on bootup. > > No clue why stack is corrupted sometimes. Is this related to the buggy > revision field? > > Some further suggestions for debugging this? Are you sure you have proper I²C bus settings on electrical level (pull-up strength, line capacitance, etc.)? > [ 3.806780] edt_ft5x06 1-0038: Model "EP0110M09", Rev. "�", 0x0 sensors > [ 3.808468] at24 2-0050: 2-0050 supply vcc not found, using dummy regulator > [ 3.814864] DEBUG: edt_ft5x06_ts_probe 1201 > [ 3.826215] DEBUG: edt_ft5x06_ts_probe 1211 > [ 3.830512] DEBUG: edt_ft5x06_ts_probe 1214 > [ 3.834904] input: EP0110M09 as /devices/platform/bus@5a000000/5a820000.i2c/i2c-1/1-0038/input/input0 > [ 3.844164] at24 2-0050: 4096 byte 24c32 EEPROM, writable, 1 bytes/write > [ 3.844264] DEBUG: edt_ft5x06_ts_probe 1222 > [ 3.850919] i2c i2c-2: LPI2C adapter registered > [ 3.855187] edt_ft5x06 1-0038: EDT FT5x06 initialized: IRQ 55, WAKE pin -1, Reset pin -1. > [ 3.867878] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: edt_ft5x06_ts_probe+0x5c4/0xb00 Maybe you can look at the assembly to see how compiler puts variables on stack. Also enabling KASAN might help. -- With Best Regards, Andy Shevchenko
