On Thu, Nov 19, 2015 at 8:57 AM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote: > On Thu, Nov 19, 2015 at 7:56 AM, Andy Lutomirski <luto@xxxxxxxxxx> wrote: >> I unloaded and reloaded hid_multitouch (on a Skylake laptop where the >> HID device is behind an integrated designware controller) and I got: >> >> [39545.054684] i2c_hid i2c-DLL0704:01: failed to retrieve report from device. >> [39545.061728] i2c_designware i2c_designware.1: >> i2c_dw_handle_tx_abort: lost arbitration >> [39545.061734] i2c_hid i2c-DLL0704:01: failed to retrieve report from device. >> [39545.061944] i2c_hid i2c-DLL0704:01: failed to retrieve report from device. >> [39545.062373] i2c_hid i2c-DLL0704:01: error in i2c_hid_init_report >> size:6 / ret_size:4 >> [39545.062564] i2c_hid i2c-DLL0704:01: failed to retrieve report from device. >> [39545.062636] input: DLL0704:01 06CB:76AE UNKNOWN as >> /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-7/i2c-DLL0704:01/0018:06CB:76AE.0005/input/input20 >> [39545.063212] hid-multitouch 0018:06CB:76AE.0005: input,hidraw1: >> <UNKNOWN> HID v1.00 Mouse [DLL0704:01 06CB:76AE] on >> [40178.534814] i2c_hid i2c-DLL0704:01: failed to retrieve report from device. >> [40178.541848] i2c_designware i2c_designware.1: >> i2c_dw_handle_tx_abort: lost arbitration >> [40178.541853] i2c_hid i2c-DLL0704:01: failed to retrieve report from device. >> [40179.542135] i2c_designware i2c_designware.1: controller timed out >> [40179.542166] i2c_hid i2c-DLL0704:01: failed to retrieve report from device. >> [40180.542909] i2c_designware i2c_designware.1: controller timed out >> [40180.542942] i2c_hid i2c-DLL0704:01: failed to retrieve report from device. >> [40181.543697] i2c_designware i2c_designware.1: controller timed out >> >> after that, I just keep seeing "controller timed out" messages. >> >> This is Linux 4.3.0. > > This just happened again (after a reboot) on its own without any > rmmod. Reloading the i2c_designware drivers didn't help, so I'm > wondering if it's a bug lower in the stack instead. > > Reloading intel-lpss-acpi after the failure says: > > [ 695.955911] idma64 idma64.0: Found Intel integrated DMA 64-bit > [ 695.966755] idma64 idma64.1: Found Intel integrated DMA 64-bit > [ 696.967468] i2c_designware i2c_designware.1: controller timed out > [ 696.967550] i2c_hid i2c-DLL0704:01: hid_descr_cmd failed > > > This is a Dell XPS 13 9350. I think the docs for all of this stuff are here: https://download.01.org/future-platform-configuration-hub/skylake/register-definitions/332219-002.pdf There's a reset register at offset 0x204 in I2C MMIO space. Should the driver be using it? --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
