11:10 <NishanthMenon> Will let mwalle comment, but he has powervr working . Errant dma-coherent in dts on j722s, which doesn't support it for GPU :(

11:13 <NishanthMenon> MTCoster: ^^ - which means, we have to figure out how to handle that of_clock hack in driver... For upstream :(

12:57 <mwalle> MTCoster: NishanthMenon: yeah I've had basically this commit since the beginning, but it wasn't working due to the wrong dma-coherent flag in my device tree: https://github.com/kontron/linux-smarc-sam67/commit/c5235f091312d8a4c534ffe1d41d82cd70328515

12:57 <mwalle> not sure if that will be accepted upstream, though

12:57 <mwalle> I've amended the comment with some insights from NishanthMenon :)

12:59 <mwalle> though I didn't test anything on it yet, still waiting for some images with some vulkan tools from my colleague

13:01 <MTCoster> NishanthMenon: That's interesting - I wonder why the integration on j722s isn't coherent (j721s2 definitely is)

13:03 <mwalle> NishanthMenon: regaring the soc specific compatible string. the gpu on the am62p and j722s is exactly the same, right?

13:03 <MTCoster> mwalle: I believe so

13:04 <NishanthMenon> Just about to drive to work, so the short version:J722s is a derivative of am62p which is built on am62 core bus chassis. Full Coherent dma comes on tda4 arch devices with msmc. J721s2, j784s4 etc have msmc proving global monitor(cache snoop and hence coherent function). But the crossbar fabric doesn't make sense for lower end devs on am62.

13:05 <NishanthMenon> In short no system wide coherency on am62 (there is limited coherent on specific low bandwidth peripherals like network etc, but not GPU)

13:07 <NishanthMenon> When I say bus, I mean network on chip(NoC) of course. TI uses TI NoC called msmc which is crossbar and a family of point to point family of nocs called cbass. Sorry, I know it is a bit too much info..

13:08 <NishanthMenon> Thanks MTCoster and mwalle .. it is always good know the mystery, else it keeps eating at me .

13:08 <NishanthMenon> Ttyl

14:17 <mwalle> will the powervr driver work with zink and glmark2?

14:18 <simon-perretta-img> Unfortunately not until VK_KHR_dynamic_rendering is implemented

14:20 <mwalle> are there any tools I can test the gpu with?

14:20 <mwalle> sorry for my ignorance, i'm more on the kernel side of things :)

14:23 <simon-perretta-img> All good! The bulk of our testing has been focused around Vulkan CTS, but something like the Sascha Willems demos could be worth playing with, unless you meant a different sort of testing?

14:24 <mwalle> yeah just something that will make use of the GPU and show something, but i guess for all of that I'll need wayland?

14:26 <mwalle> I'm calling it a day, ttyt

14:27 <simon-perretta-img> It's been a while since I've done anything with them so I might not be 100% on the details, but you should be able to get some Sascha Willems demos working without wayland or anything if built with -DUSE_D2D_WSI=ON