Claude review: drm/amd/display: Fix gamma 2.2 colorop TFs

[Claude Code Review Bot <claude-review@example.com>]

Overall Series Review

Subject: drm/amd/display: Fix gamma 2.2 colorop TFs
Author: Alex Hung <alex.hung@amd.com>
Patches: 2
Reviewed: 2026-03-13T14:43:47.091244

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This is a single-patch fix that corrects the gamma 2.2 transfer function assignments in the AMD display colorop code. The fix is straightforward, well-motivated by a bug report, and already has a `Tested-by` tag from the KDE compositor developer who reported the issue.

The change is **correct**. The existing code had `GAMMA22` and `GAMMA22_INV` swapped relative to what degamma/shaper/blend operations require. Looking at the pattern of the other transfer functions in the same lists:

- **degamma** and **blend** use linearizing (EOTF) curves: `SRGB_EOTF`, `PQ_125_EOTF`, `BT2020_INV_OETF`
- **shaper** uses de-linearizing (inverse EOTF / OETF) curves: `SRGB_INV_EOTF`, `PQ_125_INV_EOTF`, `BT2020_OETF`

Per the header documentation (`drm_colorop.h:116-117`), `GAMMA22` "applies a power curve with gamma value of 2.2" — i.e., it linearizes gamma-encoded values (an EOTF-like operation). Its inverse `GAMMA22_INV` de-linearizes. So `GAMMA22` belongs with degamma/blend, and `GAMMA22_INV` belongs with shaper — exactly what this patch does.

No concerns with the patch. It should be safe to apply.

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