Re: PixArt touchpad not detected due to wrong pinctrl

[Guido Trentalancia via Bugspray Bot <bugbot@kernel.org>]

Guido Trentalancia writes via Kernel.org Bugzilla:

The chipset is Alderlake-P as already said in https://bugzilla.kernel.org/show_bug.cgi?id=220056#c12

The issue is resolved by applying the patch from Ariel or by using the Tigerlake pinctrl kernel module, although I believe the latter approach is the wrong solution.

Some relevant system information follows. Please provide the link to the relevant official Intel PCH I2C specifications.

[dmesg | grep PIXA] || [dmesg | grep input] ** with the patch applied **
input: PIXA3848:01 093A:3848 Mouse as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-1/i2c-PIXA3848:01/0018:093A:3848.0001/input/input3
input: PIXA3848:01 093A:3848 Touchpad as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-1/i2c-PIXA3848:01/0018:093A:3848.0001/input/input4
hid-multitouch 0018:093A:3848.0001: input,hidraw0: I2C HID v1.00 Mouse [PIXA3848:01 093A:3848] on i2c-PIXA3848:01

without the patch applied or without the Tigerlake pinctrl kernel module the output of 'dmesg | grep PIXA' and 'dmesg | grep input' is blank
as the I2C PixArt touchpad device is not detected.

[cat /proc/interrupts] ** with patch applied **

 188:          0          0          0      58039          0          0          0          0          0          0          0          0 intel-gpio    3  PIXA3848:01

without the patch applied or without the Tigerlake pinctrl kernel module the output is blank, as the I2C PixArt touchpad device is not detected (see above).

[/sys/bus/acpi/devices/PIXA*/status]

cat /sys/bus/acpi/devices/PIXA3848\:0*/status
0
15

[acpidump | grep PIXA]

 71210: 0D 50 4E 50 30 43 35 30 00 12 1B 05 0A 1D 0A 68  .PNP0C50.......h
 71220: 0A 20 0D 50 49 58 41 33 38 34 38 00 0D 50 4E 50  . .PIXA3848..PNP
 71230: 30 43 35 30 00 12 16 05 0A 20 0A FF 0A FF 0D 45  0C50..... .....E
 71240: 54 44 30 35 31 38 00 0C 41 D0 0F 13 12 16 05 0A  TD0518..A.......
--
 71350: FF 0A FF 0D 45 54 44 30 35 32 32 00 0C 41 D0 0F  ....ETD0522..A..
 71360: 13 12 17 05 0A 2D 0A FF 0A FF 0D 50 49 58 41 33  .....-.....PIXA3
 71370: 38 34 38 00 0C 41 D0 0F 13 12 1A 05 0A FE 0A 15  848..A..........
 71380: 01 0D 45 4C 41 4E 30 35 30 34 00 0D 50 4E 50 30  ..ELAN0504..PNP0
--
 716E0: 50 30 43 35 30 00 12 1B 05 0A 1D 0A 68 0A 20 0D  P0C50.......h. .
 716F0: 50 49 58 41 33 38 34 38 00 0D 50 4E 50 30 43 35  PIXA3848..PNP0C5
 71700: 30 00 12 16 05 0A 20 0A FF 0A FF 0D 45 54 44 30  0..... .....ETD0
 71710: 35 31 38 00 0C 41 D0 0F 13 12 16 05 0A 21 0A FF  518..A.......!..
--
 71820: 0D 45 54 44 30 35 32 32 00 0C 41 D0 0F 13 12 17  .ETD0522..A.....
 71830: 05 0A 2D 0A FF 0A FF 0D 50 49 58 41 33 38 34 38  ..-.....PIXA3848
 71840: 00 0C 41 D0 0F 13 12 1A 05 0A FE 0A 15 01 0D 45  ..A............E
 71850: 4C 41 4E 30 35 30 34 00 0D 50 4E 50 30 43 35 30  LAN0504..PNP0C50

[lspci]

0000:00:15.0 Serial bus controller: Intel Corporation Alder Lake PCH Serial IO I2C Controller #0 (rev 01)
	Subsystem: Acer Incorporated [ALI] Device 161d
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 27
	IOMMU group: 10
	Region 0: Memory at 4017000000 (64-bit, non-prefetchable) [virtual] [size=4K]
	Capabilities: [80] Power Management version 3
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D3 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [90] Vendor Specific Information: Len=14 <?>
	Kernel driver in use: intel-lpss

0000:00:15.1 Serial bus controller: Intel Corporation Alder Lake PCH Serial IO I2C Controller #1 (rev 01)
	Subsystem: Acer Incorporated [ALI] Device 161d
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin B routed to IRQ 40
	IOMMU group: 10
	Region 0: Memory at 4017001000 (64-bit, non-prefetchable) [virtual] [size=4K]
	Capabilities: [80] Power Management version 3
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D3 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [90] Vendor Specific Information: Len=14 <?>
	Kernel driver in use: intel-lpss

0000:00:19.0 Serial bus controller: Intel Corporation Alder Lake-P Serial IO I2C Controller #0 (rev 01)
	Subsystem: Acer Incorporated [ALI] Device 161d
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 31
	IOMMU group: 13
	Region 0: Memory at 4017002000 (64-bit, non-prefetchable) [size=4K]
	Capabilities: [80] Power Management version 3
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D3 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [90] Vendor Specific Information: Len=14 <?>
	Kernel driver in use: intel-lpss

0000:00:19.1 Serial bus controller: Intel Corporation Alder Lake-P Serial IO I2C Controller #1 (rev 01)
	Subsystem: Acer Incorporated [ALI] Device 161d
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin B routed to IRQ 32
	IOMMU group: 13
	Region 0: Memory at 4017003000 (64-bit, non-prefetchable) [virtual] [size=4K]
	Capabilities: [80] Power Management version 3
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D3 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [90] Vendor Specific Information: Len=14 <?>
	Kernel driver in use: intel-lpss

0000:00:1f.4 SMBus: Intel Corporation Alder Lake PCH-P SMBus Host Controller (rev 01)
	Subsystem: Acer Incorporated [ALI] Device 161d
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Interrupt: pin A routed to IRQ 16
	IOMMU group: 15
	Region 0: Memory at 601f27c000 (64-bit, non-prefetchable) [size=256]
	Region 4: I/O ports at efa0 [size=32]
	Kernel driver in use: i801_smbus
	Kernel modules: i2c_i801

View: https://bugzilla.kernel.org/show_bug.cgi?id=220056#c20
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