[PATCH AUTOSEL 6.18-6.6] platform/x86/amd/pmc: Add quirk for MECHREVO Wujie 15X Pro

[Sasha Levin <sashal@kernel.org>]

From: gongqi <550230171hxy@gmail.com>

[ Upstream commit 2b4e00d8e70ca8736fda82447be6a4e323c6d1f5 ]

The MECHREVO Wujie 15X Pro suffers from spurious IRQ issues related to
the AMD PMC. Add it to the quirk list to use the spurious_8042 fix.

Signed-off-by: gongqi <550230171hxy@gmail.com>
Link: https://patch.msgid.link/20260122155501.376199-4-550230171hxy@gmail.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

LLM Generated explanations, may be completely bogus:

## Analysis

### Commit Message Analysis

The commit adds a DMI-based hardware quirk for the MECHREVO Wujie 15X
Pro laptop to the AMD PMC quirk list. The laptop suffers from **spurious
IRQ issues** related to the AMD PMC, and the fix applies the existing
`quirk_spurious_8042` workaround.

### Code Change Analysis

The change is a simple addition of a new DMI match entry to the
`fwbug_list[]` array:

```c
{
    .ident = "MECHREVO Wujie 15X Pro",
    .driver_data = &quirk_spurious_8042,
    .matches = {
        DMI_MATCH(DMI_BOARD_NAME, "WUJIE Series-X5SP4NAG"),
    }
},
```

This is **7 lines of new code** added to an existing quirk table. It
follows the exact same pattern as all the other entries in the table
(e.g., TUXEDO Stellaris, TUXEDO InfinityBook Pro, etc.). The quirk
mechanism (`quirk_spurious_8042`) already exists and is well-tested —
this commit simply adds another machine to the list of affected devices.

### Classification: Hardware Quirk

This falls squarely into the **"QUIRKS and WORKAROUNDS"** exception
category for stable backports:
- It's a hardware-specific quirk for a device with broken/buggy behavior
- It uses an existing, well-tested quirk mechanism
- It only affects the specific laptop model matched by DMI
- Without this quirk, the laptop experiences spurious IRQ issues which
  can cause problems during suspend/resume (a real user-facing bug)

### Scope and Risk Assessment

- **Lines changed**: 7 (addition only)
- **Files touched**: 1 (`pmc-quirks.c`)
- **Risk**: Essentially zero. The DMI match ensures this code only
  activates on the specific MECHREVO Wujie 15X Pro laptop. No other
  hardware is affected.
- **Dependencies**: None — the `quirk_spurious_8042` data structure and
  the quirk application mechanism already exist in stable trees.

### User Impact

- Users of the MECHREVO Wujie 15X Pro laptop experience spurious 8042
  IRQ issues related to the AMD PMC
- Without this quirk, the laptop likely has problems with suspend/resume
  functionality
- This is a real hardware issue affecting real users of this specific
  laptop model

### Stability Indicators

- The commit was reviewed and accepted by Ilpo Järvinen (Intel platform
  maintainer)
- It follows an established pattern with many identical entries in the
  same table
- The quirk mechanism is proven and used by multiple other laptops

### Conclusion

This is a textbook example of a hardware quirk addition that is
appropriate for stable backport. It's small, contained, zero-risk to
other hardware, fixes a real user-facing issue (spurious IRQs), and uses
an already-existing mechanism. The pattern is identical to dozens of
other quirk entries that regularly get backported.

**YES**

 drivers/platform/x86/amd/pmc/pmc-quirks.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/platform/x86/amd/pmc/pmc-quirks.c b/drivers/platform/x86/amd/pmc/pmc-quirks.c
index 404e62ad293a9..ed285afaf9b0d 100644
--- a/drivers/platform/x86/amd/pmc/pmc-quirks.c
+++ b/drivers/platform/x86/amd/pmc/pmc-quirks.c
@@ -302,6 +302,13 @@ static const struct dmi_system_id fwbug_list[] = {
 			DMI_MATCH(DMI_BOARD_NAME, "XxKK4NAx_XxSP4NAx"),
 		}
 	},
+	{
+		.ident = "MECHREVO Wujie 15X Pro",
+		.driver_data = &quirk_spurious_8042,
+		.matches = {
+			DMI_MATCH(DMI_BOARD_NAME, "WUJIE Series-X5SP4NAG"),
+		}
+	},
 	{}
 };
 
-- 
2.51.0