Public bug reported:
[ Impact ]
The spd5118 sensor will not function normally if Intel's SMBus has the
SPD Write Disable bit set. Notably, during a resume, the following
messages would appear because driver is not able to sync back the cached
register values:
[1300273.242285] spd5118 2-0050: Failed to write b = 0: -6
[1300273.242297] spd5118 2-0050: PM: dpm_run_callback(): spd5118_resume
[spd5118] returns -6
[1300273.242309] spd5118 2-0050: PM: failed to resume async: error -6
[ Fix ]
Cherry-pick the following 2 patches:
1. i2c: smbus: introduce Write Disable-aware SPD instantiating functions[1]
2. i2c: i801: Do not instantiate spd5118 under SPD Write Disable[2]
[ Tests ]
1. Install and boot the kernel. Check dmesg. The following message
should not appear:
[ 2.819557] spd5118 2-0050: DDR5 temperature sensor: vendor
0x06:0x32 revision 1.6
2. Suspend the system and resume. The error messages should not appear.
[ Where the problem could occur ]
This makes the spd5118 device not instantiate at all during the i801
controller probe. This was however what the driver author recommended,
so let's do it this way before a better solution appears.
[Additional Information]
[1]
https://lore.kernel.org/all/20250430-for-upstream-i801-spd5118-no-instantiate-v2-1-2f54d91ae...@canonical.com/
[2]
https://lore.kernel.org/all/20250613-for-upstream-not-instantiate-spd5118-v2-1-cf456ed9b...@canonical.com/
[3]
https://lore.kernel.org/all/acf31929-5d13-4fc5-b370-ab7fc5062...@roeck-us.net/
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux-oem-6.14 (Ubuntu)
Importance: Undecided
Status: New
** Tags: jira-somerville-2085 oem-priority
** Summary changed:
- [SRU] Do not instantiate SPD5118 sensors
+ [SRU] Do not instantiate SPD5118 sensors on i801 SMBus controllers
** Tags added: jira-somerville-2085 oem-priority
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https://bugs.launchpad.net/bugs/2114963
Title:
[SRU] Do not instantiate SPD5118 sensors on i801 SMBus controllers
Status in HWE Next:
New
Status in linux-oem-6.14 package in Ubuntu:
New
Bug description:
[ Impact ]
The spd5118 sensor will not function normally if Intel's SMBus has the
SPD Write Disable bit set. Notably, during a resume, the following
messages would appear because driver is not able to sync back the
cached register values:
[1300273.242285] spd5118 2-0050: Failed to write b = 0: -6
[1300273.242297] spd5118 2-0050: PM: dpm_run_callback(): spd5118_resume
[spd5118] returns -6
[1300273.242309] spd5118 2-0050: PM: failed to resume async: error -6
[ Fix ]
Cherry-pick the following 2 patches:
1. i2c: smbus: introduce Write Disable-aware SPD instantiating
functions[1]
2. i2c: i801: Do not instantiate spd5118 under SPD Write Disable[2]
[ Tests ]
1. Install and boot the kernel. Check dmesg. The following message
should not appear:
[ 2.819557] spd5118 2-0050: DDR5 temperature sensor: vendor
0x06:0x32 revision 1.6
2. Suspend the system and resume. The error messages should not
appear.
[ Where the problem could occur ]
This makes the spd5118 device not instantiate at all during the i801
controller probe. This was however what the driver author recommended,
so let's do it this way before a better solution appears.
[Additional Information]
[1]
https://lore.kernel.org/all/20250430-for-upstream-i801-spd5118-no-instantiate-v2-1-2f54d91ae...@canonical.com/
[2]
https://lore.kernel.org/all/20250613-for-upstream-not-instantiate-spd5118-v2-1-cf456ed9b...@canonical.com/
[3]
https://lore.kernel.org/all/acf31929-5d13-4fc5-b370-ab7fc5062...@roeck-us.net/
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