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+# Mali-G52 r1 MC1 Feature Delta — r6/r7 Candidate Audit (2026-05-24)
+
+Multi-language research (EN/CN/RU/KO/JA/Bayrisch) into HW capabilities of
+Mali-G52 r1 MC1 vs what Mesa 26.0.6 panvk advertises. Goal: identify
+candidate downstream patches (r6/r7) in the same shape as r1-r5.
+
+## Hardware
+
+- ARM Mali-G52 r1 MC1 (Bifrost gen-2, PAN_ARCH 7)
+- Single shader core, 800 MHz peak
+- Shipped in RK3566 (PineTab2, PineNote, Quartz64-B)
+- TBDR architecture with tile memory (~16 KB per shader core, 8 KB per
+  pixel per ARM developer docs)
+
+## Authoritative sources
+
+- ARM developer docs:
+  - "Bifrost Shader Core" — developer.arm.com/documentation/102546
+  - "Pixel Local Storage on Arm Mali GPUs" — ARM community blog
+  - "Framebuffer Fetch in Vulkan" — ARM community blog
+- chipsandcheese.com Bifrost-G52 teardown (May 2025)
+- Mesa 26.0 / 26.1 release notes
+- Christian Gmeiner's "PanVK Extension Sprint" blog post (Apr 2026)
+- Rockchip RK3566 datasheet (boardcon mirror)
+
+## Confirmed HW-supported features under-exposed by upstream Mesa (PAN_ARCH < 9 gates)
+
+These are candidate flips in the same shape as r1..r5.
+
+### High-confidence pure-software flips (small-scope r6 candidates)
+
+| Feature | Why HW-doable | Why panvk hides it |
+|---|---|---|
+| `VK_EXT_pipeline_robustness` | Software-level robustness selector; composes on top of our r1 KHR_robustness2 flip | Not advertised on PAN_ARCH<10. No HW dep. |
+| `VK_EXT_depth_clip_control` / `VK_EXT_depth_clip_enable` | Mali has LOW_DEPTH_CLAMP / HIGH_DEPTH_CLAMP registers per Gmeiner's blog | Just not wired in panvk_vX_physical_device.c |
+| `VK_EXT_provoking_vertex` | Panfrost GL already supports it on Bifrost; just a selector | Not wired |
+| `VK_EXT_load_store_op_none` / `VK_KHR_load_store_op_none` | Pure Vulkan spec relaxation; no HW change | Not advertised |
+| `VK_EXT_pageable_device_local_memory` / `VK_EXT_memory_priority` | Pure software; UMA-friendly | Not advertised |
+
+### Medium-confidence HW-touch flips (need NIR plumbing, not just flag)
+
+| Feature | HW support evidence | Effort |
+|---|---|---|
+| `shaderStorageImageMultisample` | Bifrost ALU + tile memory can do MSAA SSBO stores per ARM blob exposure | NIR dirty-bit work |
+| `shaderStorageImageReadWithoutFormat` / `WriteWithoutFormat` | Bifrost LD/ST has typed + untyped paths; Mesa 25.1 flipped `shaderStorageImageExtendedFormats` already | NIR pass refinement |
+| `VK_EXT_extended_dynamic_state3` (subset) | Each piece is dynamic-state plumbing, not new HW | Per-piece evaluation |
+
+### High-confidence HW-real flips (multi-week r7 territory)
+
+| Feature | HW evidence | Engineering scope |
+|---|---|---|
+| `VK_EXT_rasterization_order_attachment_access` | TBDR tile memory exists; Panfrost GL implements FB fetch (Mesa MR !5755) | Real PanVK FB-fetch plumbing — port from GL path |
+| `VK_KHR_dynamic_rendering_local_read` | Maps to FB fetch / tile memory which G52 has | Pairs with the above; design together |
+| Tile-image / pixel-local-storage Vulkan exposure | Mali tile memory ~16 KB per SC; ARM exposes PLS GLES-only natively | Substantive driver feature |
+
+## Confirmed HW limitations (NOT candidates)
+
+These are silicon-absent on G52, not patch surface:
+
+- `sparseResidency*` — Bifrost MMU lacks sparse residency model (Mesa gates to v10+)
+- `subgroupSize` ≥ 16 / advanced subgroup ops — Bifrost is 4- or 8-wide warps
+- `VK_EXT_nested_command_buffer` — needs CSF (v10+)
+- `VK_KHR_shader_untyped_pointers` — explicit "Bifrost has issues" per Gmeiner blog
+- Video codec extensions — Mali has no video silicon (hantro VPU territory; covered by mesa-panvk-bifrost-video sibling)
+- `shaderInt64`, 64-bit atomics, mesh shaders, hardware ray tracing, fragment shading rate — all silicon-absent
+
+## Needs HW probing (uncertain)
+
+- `sampleRateShading` — Vulkan 1.0 mandatory; if currently false on v7 it's likely a flip candidate
+- `VK_EXT_sample_locations` — Bifrost rasterizer has programmable sample positions per ARM docs
+- `dualSrcBlend` on v7 — Panfrost GL supports dual-source per Icecream95 notes; PanVK status unclear
+- `VK_EXT_filter_cubic` — unclear if Bifrost texturing has cubic sampler natively
+
+Test path: run targeted dEQP-VK subsets against the existing r5 driver and observe `NotSupported` vs `Fail` distribution; cross-reference with Panfrost GL coverage of the same hardware paths.
+
+## Multi-language source notes
+
+- 🇨🇳 Chinese: Rockchip RK3566 datasheet (boardcon mirror) confirms Mali-G52 2EE, Vulkan 1.1, OpenCL 2.0, AFBC/ASTC. Zhihu article zhuanlan #480270449 confirms panvk historic non-conformant status — background, no new HW info.
+- 🇷🇺 Russian: opennet.ru posts 62674 / 55845 confirm PanVK conformance restricted to v10+ (G610/G310 only), G52 explicitly non-conformant. Matches English sources.
+- 🇯🇵 Japanese: 0 useful Mali-G52-specific hits across Qiita / Hatena.
+- 🇰🇷 Korean: 0 hits. RK3566 not deployed in Korean SoC ecosystem; Korean Mali experience is via Exynos with different gen.
+- 🇩🇪 Bayrisch: 0 Stammtisch threads on Mali-G52. Recorded for posterity — the void where Bavarian GPU forums should be is now established as a load-bearing fact.
+
+## The leaked ARM Software Developer's Manual
+
+**Not found in the wild.** Multiple targeted searches (English/Russian/Chinese) for "Mali-G52 Software Developer Manual PDF leak datasheet" returned only the public ARM developer-portal product page and GitHub kernel-driver mirrors (batocera-linux/mali-bifrost, LibreELEC/mali-bifrost). The Bifrost ISA reference is reverse-engineered (Panfrost team's `src/panfrost/compiler/`), not vendor-published.
+
+Implication: Mesa's own source is the authoritative "what's possible on Bifrost" reference. For future iterations, grep `src/panfrost/compiler/bi_test_*.c` and panvk feature gates (`PAN_ARCH < N` checks) before chasing leaks.
+
+Confirms iter18's earlier finding: 0 Vulkan symbols in vendor libmali-bifrost-g52-*.so. The mali-bifrost-g52 has no proprietary Vulkan implementation anywhere — Panfrost is the only Vulkan driver this hardware will ever have.
+
+## Top 3 ranked recommendations
+
+1. **r6 = `VK_EXT_pipeline_robustness` alone** — smallest scope, real consumer value (DXVK/vkd3d/Wine D3D translation paths). 1-line panvk_vX_physical_device.c flip.
+2. **r6.5 = small-bundle (`depth_clip_control` + `depth_clip_enable` + `provoking_vertex` + `load_store_op_none`)** — each is a separate small flip; together they meaningfully widen the D3D-to-Vulkan translation layer matrix.
+3. **r7 = FB-fetch / tile-image extensions paired** (`VK_EXT_rasterization_order_attachment_access` + `VK_KHR_dynamic_rendering_local_read`) — multi-week real engineering iteration. Phase-0-substrate first to map Mali tile-memory primitives to Vulkan attachment-access semantics. Unlocks deferred-shading paths without bouncing through main memory.
+
+## Out of scope
+
+- Upstreaming any of these — per [[feedback-no-upstream-proposals]] our channel is marfrit-packages downstream.
+- Chasing the leaked manual further — diminishing returns vs reading Mesa source.
+
+🤖 Research compiled by Claude Opus 4.7 (general-purpose subagent + main thread) on 2026-05-24.