I2c controller not detected (was I2c touchpad not work)

[VitaliS]

System not crashed, i send log i2c out info

[waddlesplash]

The I2C input driver isn't actually included in builds yet.

[VitaliS]

Forgot to note that this is Release Candidate 0

[tqh]

I have the same problem for Sunrise Point IC2 controller.

It seems memory where we check for capabilities is all ones according to the second value on the second line:

KERN: [33mpch_i2c_pci:[0m init_bus() addr 0xfe024000 size 0x1000 irq 0x12
KERN: [33mpch_i2c_pci:[0m init_bus() 0xf (0xffffffff)
KERN: [33mpch_i2c_pci:[0m init_bus() device type not supported

Coming from:

	TRACE_ALWAYS("init_bus() addr 0x%" B_PRIxPHYSADDR " size 0x%" B_PRIx64
		" irq 0x%x\n", bus->base_addr, bus->map_size, bus->irq);
[...]
	TRACE_ALWAYS("init_bus() 0x%" B_PRIx32 " (0x%" B_PRIx32 ")\n",
		(bus->capabilities >> PCH_SUP_CAPABLITIES_TYPE_SHIFT)
			& PCH_SUP_CAPABLITIES_TYPE_MASK,
		bus->capabilities);
[...]
		ERROR("init_bus() device type not supported\n");

Not sure how different this hardware is, might just have capabilites at different offset or need another driver?

[korli]

A syslog would be nice to identify the devices. The device might need to be powered up?

[tqh]

It is different hardware, I think it is called systembus and the specs I read for sunrise do not have the cababilities regiester anymore. I'll attach the full syslog as well.

[tqh]

smbus style I2C controller on Sunrise Point

[tqh]

I'll probably start experimenting a bit with this (no promises), any pointers?

[tqh]

These references are what I can find so far:
​Skylake Platform Controller Hub H and LP (SKL PCH H / LP) Register Information (UART, I2C, GSPI, eMMC, SDXC, and GPIO)
and
​Intel® 9 Series Chipset Family Platform Controller Hub (PCH) - Datasheet

[tqh]

Interesting reading starts at 5.22 SMBus Controller (D31:F3) in the Intel 9 PDF where it starts going into i2c communication a bit.

[tqh]

QEMU can emulate it with Q35 so should be able to be done on virtual machine for initial work:

• ​https://wiki.qemu.org/Features/Q35
• ​https://github.com/qemu/qemu/blob/master/docs/config/q35-emulated.cfg