Bug 2218451

Summary: i2c: Systems with more than 4 memory slots not supported yet, not instantiating SPD
Product: [Fedora] Fedora Reporter: Sandro Bonazzola <sbonazzo>
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 38CC: acaringi, adscvr, airlied, alciregi, bskeggs, hdegoede, hpa, jarodwilson, josef, kernel-maint, lgoncalv, linville, masami256, mchehab, ptalbert, steved
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Hardware: x86_64   
OS: Linux   
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Description Sandro Bonazzola 2023-06-29 08:00:35 UTC 
dmesg shows the following warning:
i2c i2c-16: Systems with more than 4 memory slots not supported yet, not instantiating SPD

# i2cdetect -l
i2c-0	i2c       	Synopsys DesignWare I2C adapter 	I2C adapter
i2c-1	i2c       	Synopsys DesignWare I2C adapter 	I2C adapter
i2c-2	i2c       	i915 gmbus dpa                  	I2C adapter
i2c-3	i2c       	i915 gmbus dpb                  	I2C adapter
i2c-4	i2c       	i915 gmbus dpc                  	I2C adapter
i2c-5	i2c       	i915 gmbus tc1                  	I2C adapter
i2c-6	i2c       	i915 gmbus tc2                  	I2C adapter
i2c-7	i2c       	i915 gmbus tc3                  	I2C adapter
i2c-8	i2c       	i915 gmbus tc4                  	I2C adapter
i2c-9	i2c       	i915 gmbus tc5                  	I2C adapter
i2c-10	i2c       	i915 gmbus tc6                  	I2C adapter
i2c-11	i2c       	AUX A/DDI A/PHY A               	I2C adapter
i2c-12	i2c       	AUX USBC1/DDI TC1/PHY TC1       	I2C adapter
i2c-13	i2c       	AUX USBC2/DDI TC2/PHY TC2       	I2C adapter
i2c-14	i2c       	AUX USBC3/DDI TC3/PHY TC3       	I2C adapter
i2c-15	i2c       	AUX USBC4/DDI TC4/PHY TC4       	I2C adapter
i2c-16	smbus     	SMBus I801 adapter at efa0      	SMBus adapter

# decode-dimms 
No EEPROM found, try loading the eeprom, at24 or ee1004 module


System Information:
	Manufacturer: LENOVO
	Product Name: 20WNS1F804
	Version: ThinkPad T14s Gen 2i

BIOS Information
	Vendor: LENOVO
	Version: N35ET53W (1.53 )
	Release Date: 03/22/2023

Not sure if it has functional implications but if it's just informative perhaps it shouldn't be issued as warning.

Reproducible: Always
Comment 1 Sandro Bonazzola 2023-06-29 08:31:56 UTC 
00:1f.4 SMBus: Intel Corporation Tiger Lake-LP SMBus Controller (rev 20)
	Subsystem: Lenovo Device 22d1
	Flags: medium devsel, IRQ 16, IOMMU group 12
	Memory at 603d1cc000 (64-bit, non-prefetchable) [size=256]
	I/O ports at efa0 [size=32]
	Kernel driver in use: i801_smbus
	Kernel modules: i2c_i801