On Mon, Nov 3, 2025 at 2:38 PM Connor Abbott <[email protected]> wrote: > > On Mon, Nov 3, 2025 at 4:09 AM ☺︎□︎■︎♋︎⧫︎♒︎♋︎■︎ <[email protected]> wrote: > > > > I know the freedreno turnip docs say that there are no plans for supporting > > 5xx gpus and lower. I want to ask about why that is. > > Is there some form of major architectural change between 5xx and 6xx that > > makes 5xx support take too much work? > > Yes. a6xx adds support for bindless descriptors. Using bindless > descriptors entails completely changing how descriptor handling works > in the driver, as without bindless descriptors a lot more has to be > emulated in the driver. Our whole strategy for handling input > attachments also falls apart if you only have the old bindful > descriptors and you'd have to do something completely different. This > is the main hurdle for any a5xx Vulkan driver, and it also means > VK_EXT_descriptor_indexing and Vulkan 1.2 are impossible on a5xx. > There are also significant changes in how draw states work which make > emitting commands much more awkward on a5xx. There are probably other > things I'm forgetting about here too. > > That's not to say that it's impossible, just that it requires someone > with a lot of expertise to rewrite significant parts of the driver and > no one currently working on turnip is particularly keen on it as the > reward is not worth it.
The SET_DRAW_STATE changes between a5xx and a6xx would mean that a5xx needs a different approach to cmdstream building for hw binning as well. Between that and bindless, if someone were to add a5xx vk support, I suspect it would make more sense to be a different driver (but maybe w/ some shared helpers) from turnip. BR, -R > Connor > > > Is there simply not enough people willing to develop/test the drivers to > > make support available? Is there some other reason that I can't really > > think of right now? > > Another related question: Is there any way to have vulkan support on an > > adreno 5xx gpu at all on (normal)* Linux distros? I know on custom > > android-based systems there are drivers that can provide vulkan 1.1 > > support**, so the hardware is at least capable of support. I mainly ask > > this because I had an admittedly deranged idea to potentially make an old > > phone of mine act more like a mini computer by running an arm-based linux > > os on it, but I would prefer to still have vulkan support. > > I understand if you aren't able to fully answer some (or all) of the > > questions I asked, and I'm sorry if this is technically the wrong place to > > ask. > > > > *Normal as in more desktop like, and less android/chromeos/ios like. > > **This might depend on the device though. The OGL/VK driver I found is > > under the "LG G5" category, and I can't safely assume that this would 100% > > work on other hardware.
