[Bug 111995] [KBL] Black screen with I915_FORMAT_MOD_Y_TILED_CCS (Requested display configuration exceeds system DDB limitations)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111995

--- Comment #2 from Marius Vlad <marius.vlad at collabora.com> ---
Hmm, I always get that when trying to use both planes, but when using AR24.
XR24 works just fine on scan-out (primary)


[51903.929518] [drm:skl_allocate_pipe_ddb [i915]] Requested display
configuration exceeds system DDB limitations
[51903.929551] [drm:skl_allocate_pipe_ddb [i915]] minimum required 964/847
[51903.929584] [drm:drm_atomic_check_only [drm]] atomic driver check for
000000004889d62d failed: -22
[51903.929615] [drm:drm_atomic_state_default_clear [drm]] Clearing atomic state
000000004889d62d

but even so, weston is able to continue just fine switching to mixed mode of
compositing

[atomic] drmModeAtomicCommit
                [view] failing state generation: atomic test not OK
        [repaint] could not build planes-only state, trying mixed

For reference this seems to happen when using AR24 on scan-out not XR24 (which
I tested many times before). 

Here's the current state of both planes, before doing the TEST_ONLY bit. 

                        [CRTC:47] 22 (MODE_ID) -> 120 (0x78)
                        [CRTC:47] 21 (ACTIVE) -> 1 (0x1)
                        [CONN:85] 19 (CRTC_ID) -> 47 (0x2f)
                        [PLANE:37] 16 (FB_ID) -> 122 (0x7a)
                        [PLANE:37] 19 (CRTC_ID) -> 47 (0x2f)
                        [PLANE:37] 8 (SRC_X) -> 0 (0x0)
                        [PLANE:37] 9 (SRC_Y) -> 0 (0x0)
                        [PLANE:37] 10 (SRC_W) -> 251658240 (0xf000000)
                        [PLANE:37] 11 (SRC_H) -> 141557760 (0x8700000)
                        [PLANE:37] 12 (CRTC_X) -> 0 (0x0)
                        [PLANE:37] 13 (CRTC_Y) -> 0 (0x0)
                        [PLANE:37] 14 (CRTC_W) -> 3840 (0xf00)
                        [PLANE:37] 15 (CRTC_H) -> 2160 (0x870)
                        [PLANE:37] FORMAT: XRGB8888
                        [PLANE:30] 16 (FB_ID) -> 121 (0x79)
                        [PLANE:30] 19 (CRTC_ID) -> 47 (0x2f)
                        [PLANE:30] 8 (SRC_X) -> 0 (0x0)
                        [PLANE:30] 9 (SRC_Y) -> 0 (0x0)
                        [PLANE:30] 10 (SRC_W) -> 251658240 (0xf000000)
                        [PLANE:30] 11 (SRC_H) -> 141557760 (0x8700000)
                        [PLANE:30] 12 (CRTC_X) -> 0 (0x0)
                        [PLANE:30] 13 (CRTC_Y) -> 0 (0x0)
                        [PLANE:30] 14 (CRTC_W) -> 3840 (0xf00)
                        [PLANE:30] 15 (CRTC_H) -> 2160 (0x870)
                        [PLANE:30] FORMAT: ARGB8888

Do note, this is with e-DP as connector (it's previous gen xps 13'' laptop w/
i7-8550U).

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