Hi Eric et al, In a number of windowing environments (eg GNOME 3) on Raspberry Pi 3B on 4.16.0 arm64, the mouse cursor top-left gets down to x,y -4,-4, tripping WARN_ON_ONCE(plane->state->crtc_x < 0 || plane->state->crtc_y < 0) [1], which therefore seems false-positive.
Git history doesn't turn up any reason, eg it could cause undefined hardware behaviour, which it doesn't appear to, so would it be better to drop the warning, or adjust it to trip on x or y < -4 or so? If so, I'll prepare a patch to adjust it. [Side note: simply opening the GNOME 3 Activities menu with libgl1-mesa-dri 17.3.7 is a reliable way to reproduce "[drm] Resetting GPU"] Thanks, Dan -- [1] WARNING: CPU: 3 PID: 966 at drivers/gpu/drm/vc4/vc4_plane.c:771 vc4_plane_async_set_fb+0x98/0xa0 CPU: 3 PID: 966 Comm: Xorg Tainted: G S 4.16.0+ #13 Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT) pstate: 00000005 (nzcv daif -PAN -UAO) pc : vc4_plane_async_set_fb+0x98/0xa0 lr : vc4_plane_async_set_fb+0x4c/0xa0 sp : ffff0000086ab9b0 x29: ffff0000086ab9b0 x28: 0000000000000000 x27: 0000000000000009 x26: 00000000fffffffc x25: ffffa81b36ca8b00 x24: ffffa81b30667c00 x23: 0000000000400000 x22: ffffa81b30790400 x21: ffffa81b36ca8b00 x20: ffffa81b30a53018 x19: ffffa81b30667c00 x18: ffffffffffffffff x17: 0000ffffb4fcec50 x16: ffff3447cc0e8588 x15: ffff3447d14fbf88 x14: ffff344851bb337f x13: ffff3447d1bb338d x12: ffff3447d153b000 x11: ffff3447d14fc7f0 x10: ffff3447ccb3dac8 x9 : 00000000ffffffd0 x8 : 0000000000000005 x7 : 3932373639343932 x6 : 000000000000056e x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000 x2 : ed59bd53d8905e00 x1 : 00000000fffffffc x0 : ffffa81b30667c00 Call trace: vc4_plane_async_set_fb+0x98/0xa0 vc4_update_plane+0x124/0x1a0 __setplane_internal+0x1f4/0x260 drm_mode_cursor_universal+0xf4/0x220 drm_mode_cursor_common+0x19c/0x218 drm_mode_cursor2_ioctl+0x34/0x48 drm_ioctl_kernel+0x70/0xd8 drm_ioctl+0x30c/0x438 do_vfs_ioctl+0xc4/0x880 SyS_ioctl+0x8c/0xa8 el0_svc_naked+0x30/0x34 -- Daniel J Blueman
