> /* If set, we'll require the use of single render-target framebuffer > * descriptors (SFBD), for older hardware -- specifically, <T760 hardware, If
This require_sfbd field should also be set at the same time. In particular, we'll want a (kernel-agnostic) routine to determine whether a given chip version supports MFBD, so we know to use it or not. In kernel-space, this corresponds to the "FEATURE_MRT" flag. We'll want to import this to userspace, but tl;dr "T760+ is MFBD, T6XX/T720 is SFBD". > + ctx->is_t6xx = pscreen->driver->query_gpu_version(pscreen) == 0x0750; Where did this magic number come from? Is that for T760 or actually T600 or something else or...? For Midgard only, I suppose <= 0x0750 is probably what you want but we'll see. > + unsigned (*query_gpu_version) (struct panfrost_screen *screen); I'll implement this in the non-DRM module as well (tonight, if I get time for it), but that's needed for merging to avoid regressing. Just making a mental note to self -- nothing for you to worry about here :)
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