research: r6/r7 Mali-G52 r1 MC1 feature audit (multi-language sourcing) #3
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marfrit (Markus Fritsche)
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Reference: marfrit/panvk-bifrost#3
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Summary
Multi-language web research (EN/CN/RU/KO/JA/Bayrisch) on the actual hardware feature set of Mali-G52 r1 MC1 vs what Mesa 26.0.6 panvk advertises. Goal: identify candidate downstream patches in the same shape as our existing r1-r5 lineage.
Lands at
research/r6_r7_mali_g52_feature_audit_2026-05-24.md. Persistent home so we don't lose it to/tmpcleanup. Reading order: top of the file → "Top 3 ranked recommendations" at the bottom.Top-3 candidates surfaced
VK_EXT_pipeline_robustness— smallest scope, real consumer value (DXVK/vkd3d/Wine D3D translation paths). 1-line panvk_vX_physical_device.c flip composing on top of our r1 KHR_robustness2.depth_clip_control+depth_clip_enable+provoking_vertex+load_store_op_none+pageable_device_local_memory+memory_priority. Each individually small; together meaningfully widens the D3D-to-Vulkan translation layer matrix.VK_EXT_rasterization_order_attachment_access+VK_KHR_dynamic_rendering_local_read) — multi-minute real engineering iteration. Bifrost TBDR tile memory supports this; Panfrost GL already implements FB fetch (Mesa MR !5755). PanVK port needed.Source archaeology
The leaked ARM Mali-G52 Software Developer Manual is not in the wild — confirmed via targeted searches in EN/RU/CN. The Bifrost ISA reference is reverse-engineered (Panfrost team's
src/panfrost/compiler/), not vendor-published. Mesa source remains the authoritative reference. Confirms our iter18 finding (0 Vulkan symbols in vendor libmali) at a higher confidence: Panfrost is and will be the only Vulkan driver this hardware ever has.Test plan
Pure documentation PR — no test plan beyond "markdown renders cleanly on Gitea".
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Multi-language web research (EN/CN/RU/KO/JA/Bayrisch) on the actual hardware feature set of Mali-G52 r1 MC1 vs what Mesa 26.0.6 panvk advertises. Goal: identify candidate downstream patches in the same shape as r1-r5. Top-3 r6/r7 candidates surfaced: 1. r6 = VK_EXT_pipeline_robustness — 1-line flip, composes on top of our r1 KHR_robustness2, real consumer value (DXVK/vkd3d/Wine). 2. r6.5 = small-bundle (depth_clip_control, depth_clip_enable, provoking_vertex, load_store_op_none, pageable_device_local_memory, memory_priority) — each individually small, together meaningfully widens the D3D-to-Vulkan translation matrix. 3. r7 = FB-fetch + dynamic_rendering_local_read paired — real engineering iteration, multi-week. Bifrost TBDR tile memory supports this; Panfrost GL already implements FB fetch (Mesa MR !5755). PanVK port needed. Confirmed not-candidates: sparseResidency*, subgroupSize ≥ 16, mesh / RT / FSR / 64-bit atomics — silicon-absent on G52. Source archaeology: the leaked ARM Mali-G52 Software Developer Manual is not in the wild (multi-language search came up dry). Mesa source is the authoritative reference; iter18 already confirmed 0 Vulkan symbols in vendor libmali-bifrost-g52-*.so. Panfrost is and will be the only Vulkan driver this hardware ever has. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>