Allow dcp interchange to scanout interchange compressed

[oliverbestmann]

Works together with this mesa MR:
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39755

[Conan-Kudo]

The UAPI change needs to be separately contributed to Linux directly, not this fork.

See this documentation: https://docs.kernel.org/process/submitting-patches.html

[jannau]

For experimenting we should move this into the driver with

#ifndef DRM_FORMAT_MOD_APPLE_INTERCHANGE_COMPRESSED
#define DRM_FORMAT_MOD_APPLE_INTERCHANGE_COMPRESSED fourcc_mod_code(APPLE, 3)
#endif

I'm not sure if we want one or more APPLE_INTERCHANGE_COMPRESSED modifiers to handle YCbCr formats which use 32x32 tiles for Y

[chadmed]

Is this enough of a difference to warrant a new format modifier? If the tile size only changes for the luma channel of Y'CbCr textures, can we not just handle that by checking is_yuv for the framebuffer format info struct? E.g.

tile_w = fb->format->is_yuv ? 32 : 16

[waltmck]

Thank you for the exciting work!

I tested this with nixos-apple-silicon 6.10 using your flake, on an M2 Macbook Air. Hyprland fails to launch with the following repeated log message:

kernel: apple-dcp 231c00000.dcp: swap failed! status 4
kernel: dcp: plane 0 modifiers: c00000000000003
kernel: apple-dcp 231c00000.dcp: RTKit: syslog message: UPPipe.cpp:3920: IOMFB verify_uc_surface: Planesize insufficient for data plane size 17039360, data size 17301504
kernel: apple-dcp 231c00000.dcp: RTKit: syslog message: UPPipeDCP_H13P.cpp:4554: bool IOMFB::UPPipeDCP_H13P::verify_surfaces(IOMFB::SwapRequest *): Error with the interchange surface
kernel: apple-dcp 231c00000.dcp: RTKit: syslog message: FramebufferDCP.cpp:2175: AppleCLCD: verify_swap failed for swap id: 4285