On Tue, May 4, 2021 at 9:22 PM Alex Deucher alexdeucher@gmail.com wrote:
On Wed, Apr 28, 2021 at 5:21 PM Alex Deucher alexdeucher@gmail.com wrote:
On Tue, Apr 20, 2021 at 5:25 PM Alex Deucher alexdeucher@gmail.com wrote:
On Fri, Apr 16, 2021 at 12:29 PM Mario Kleiner mario.kleiner.de@gmail.com wrote:
Friendly ping to the AMD people. Nicholas, Harry, Alex, any feedback? Would be great to get this in sooner than later.
No objections from me.
I don't have any objections to merging this. Are the IGT tests available?
Any preference on whether I merge this through the AMD tree or drm-misc?
Alex
Hi Alex, in case the question is addressed to myself: I prefer whatever gets it into drm-next asap, so we can sync the drm_fourcc.h headers from drm-next to the IGT tests, libdrm, amdvlk etc.
Another thing:Unless this would still make it into the Linux 5.13 merge window, we'd also need a KMS_DRIVER_MINOR bump 41 -> 42. This way amdgpu-pro's Vulkan driver could know about the new 16 bpc pixel formats for the out of tree amdgpu-dkms package when running against older kernels.
thanks, -mario
Alex
Alex
Thanks and have a nice weekend, -mario
On Fri, Mar 19, 2021 at 10:03 PM Mario Kleiner mario.kleiner.de@gmail.com wrote:
Hi,
this patch series adds the fourcc's for 16 bit fixed point unorm framebuffers to the core, and then an implementation for AMD gpu's with DisplayCore.
This is intended to allow for pageflipping to, and direct scanout of, Vulkan swapchain images in the format VK_FORMAT_R16G16B16A16_UNORM. I have patched AMD's GPUOpen amdvlk OSS driver to enable this format for swapchains, mapping to DRM_FORMAT_XBGR16161616: Link: https://github.com/kleinerm/pal/commit/a25d4802074b13a8d5f7edc96ae45469ecbac...
My main motivation for this is squeezing every bit of precision out of the hardware for scientific and medical research applications, where fp16 in the unorm range is limited to ~11 bpc effective linear precision in the upper half [0.5;1.0] of the unorm range, although the hardware could do at least 12 bpc.
It has been successfully tested on AMD RavenRidge (DCN-1), and with Polaris11 (DCE-11.2). Up to two displays were active on RavenRidge (DP 2560x1440@144Hz + HDMI 2560x1440@120Hz), the maximum supported on my hw, both running at 10 bpc DP output depth.
Up to three displays were active on the Polaris (DP 2560x1440@144Hz + 2560x1440@100Hz USB-C DP-altMode-to-HDMI converter + eDP 2880x1800@60Hz Apple Retina panel), all running at 10 bpc output depth.
No malfunctions, visual artifacts or other oddities were observed (apart from an adventureous mess of cables and adapters on my desk), suggesting it works.
I used my automatic photometer measurement procedure to verify the effective output precision of 10 bpc DP native signal + spatial dithering in the gpu as enabled by the amdgpu driver. Results show the expected 12 bpc precision i hoped for -- the current upper limit for AMD display hw afaik.
So it seems to work in the way i hoped :).
Some open questions wrt. AMD DC, to be addressed in this patch series, or follow up patches if neccessary:
- For the atomic check for plane scaling, the current patch will
apply the same hw limits as for other rgb fixed point fb's, e.g., for 8 bpc rgb8. Is this correct? Or would we need to use the fp16 limits, because this is also a 64 bpp format? Or something new entirely?
I haven't added the new fourcc to the DCC tables yet. Should i?
I had to change an assert for DCE to allow 36bpp linebuffers (patch 4/5).
It looks to me as if that assert was inconsistent with other places in the driver where COLOR_DEPTH121212 is supported, and looking at the code, the change seems harmless. At least on DCE-11.2 the change didn't cause any noticeable (by myself) or measurable (by my equipment) problems on any of the 3 connected displays.
- Related to that change, while i needed to increase lb pixelsize to 36bpp
to get > 10 bpc effective precision on DCN, i didn't need to do that on DCE. Also no change of lb pixelsize was needed on either DCN or DCe to get > 10 bpc precision for fp16 framebuffers, so something seems to behave differently for floating point 16 vs. fixed point 16. This all seems to suggest one could leave lb pixelsize at the old 30 bpp value on at least DCE-11.2 and still get the > 10 bpc precision if one wanted to avoid the changes of patch 4/5.
Thanks, -mario
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