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igt@kms_plane_scaling@subtests - incomplete/dmesg-warn - *ERROR* CPU pipe A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_11514/shard-kbl3/igt@kms_plane_scaling@scaler-with-pixel-format-unity-scaling@pipe-a-dp-1-scaler-with-pixel-format.html

<7> [66.959212] i915 0000:00:02.0: [drm:skl_compute_wm [i915]] [PLANE:31:plane 1A]   level *wm0,*wm1,*wm2,*wm3,*wm4,*wm5,*wm6,*wm7, twm, swm, stwm -> *wm0,*wm1,*wm2,*wm3,*wm4,*wm5,*wm6,*wm7, twm, swm, stwm
<7> [66.959304] i915 0000:00:02.0: [drm:skl_compute_wm [i915]] [PLANE:31:plane 1A]   lines    0,  16,  16,  16,  16,  16,  16,  16,   0,   0,    0 ->    0,  16,  16,  16,  16,  16,  16,  16,   0,   0,    0
<7> [66.959397] i915 0000:00:02.0: [drm:skl_compute_wm [i915]] [PLANE:31:plane 1A]  blocks   61, 121, 121, 121, 121, 121, 121, 121,   0,   0,    0 ->   31,  61,  61,  61,  61,  61,  61,  61,   0,   0,    0
<7> [66.959489] i915 0000:00:02.0: [drm:skl_compute_wm [i915]] [PLANE:31:plane 1A] min_ddb   62, 122, 122, 122, 122, 122, 122, 122,   0,   0,    0 ->   32,  62,  62,  62,  62,  62,  62,  62,   0,   0,    0
<7> [66.959644] i915 0000:00:02.0: [drm:intel_atomic_setup_scalers [i915]] Attached scaler id 0.0 to PLANE:31
<7> [66.980801] [drm:drm_mode_addfb2] [FB:144]
<7> [67.039432] i915 0000:00:02.0: [drm:skl_update_scaler [i915]] scaler_user index 0.0: Staged freeing scaler id 0 scaler_users = 0x0
<7> [67.039699] i915 0000:00:02.0: [drm:skl_compute_wm [i915]] [PLANE:31:plane 1A] ddb ( 553 -  860) -> (   0 -  860), size  307 ->  860
<7> [67.039795] i915 0000:00:02.0: [drm:skl_compute_wm [i915]] [PLANE:31:plane 1A]   level *wm0,*wm1,*wm2,*wm3,*wm4,*wm5,*wm6,*wm7, twm, swm, stwm -> *wm0,*wm1,*wm2,*wm3,*wm4,*wm5,*wm6,*wm7, twm, swm, stwm
<7> [67.039887] i915 0000:00:02.0: [drm:skl_compute_wm [i915]] [PLANE:31:plane 1A]   lines    0,  16,  16,  16,  16,  16,  16,  16,   0,   0,    0 ->    0,  16,  16,  16,  16,  16,  16,  16,   0,   0,    0
<7> [67.039979] i915 0000:00:02.0: [drm:skl_compute_wm [i915]] [PLANE:31:plane 1A]  blocks   31,  61,  61,  61,  61,  61,  61,  61,   0,   0,    0 ->  121, 241, 241, 241, 241, 241, 241, 241,   0,   0,    0
<7> [67.040072] i915 0000:00:02.0: [drm:skl_compute_wm [i915]] [PLANE:31:plane 1A] min_ddb   32,  62,  62,  62,  62,  62,  62,  62,   0,   0,    0 ->  122, 242, 242, 242, 242, 242, 242, 242,   0,   0,    0
<7> [67.057726] [drm:drm_mode_addfb2] [FB:145]
<3> [67.058968] i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun
Edited by Ravi V
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