[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

Tue Sep 18 13:01:09 UTC 2018

https://bugs.freedesktop.org/show_bug.cgi?id=107978

            Bug ID: 107978
           Summary: [amdgpu] Switching to tty fails with DisplayPort
                    monitor going to sleep (REG_WAIT timeout /
                    dce110_stream_encoder_dp_blank)
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: shtetldik at gmail.com

After upgrading to Linux 4.19-rc3 (from 4.18.x), I can't switch to tty anymore,
the monitor connected over DisplayPort goes into sleep mode.

I see this in dmesg when it happens:

[37342.777399] [drm:generic_reg_wait [amdgpu]] *ERROR* REG_WAIT timeout 10us *
3000 tries - dce110_stream_encoder_dp_blank line:922
[37342.777477] WARNING: CPU: 4 PID: 14403 at
drivers/gpu/drm/amd/amdgpu/../display/dc/dc_helper.c:254
generic_reg_wait+0xe7/0x160 [amdgpu]
[37342.777478] Modules linked in: uas usb_storage rfcomm ebtable_filter
ebtables devlink ip6table_filter ip6_tables iptable_filter cmac bnep arc4
nls_ascii nls_cp437 vfat amdkfd fat snd_hda_codec_realtek snd_hda_codec_generic
edac_mce_amd btusb btrtl amdgpu btbcm snd_hda_codec_hdmi btintel iwlmvm
snd_usb_audio snd_hda_intel bluetooth kvm_amd snd_hda_codec snd_usbmidi_lib
wmi_bmof mxm_wmi mac80211 snd_hda_core kvm uvcvideo videobuf2_vmalloc snd_hwdep
videobuf2_memops snd_rawmidi jitterentropy_rng videobuf2_v4l2 videobuf2_common
snd_seq_device chash iwlwifi irqbypass gpu_sched videodev snd_pcm
crct10dif_pclmul ttm crc32_pclmul media drbg snd_timer evdev drm_kms_helper
cfg80211 ansi_cprng ghash_clmulni_intel efi_pstore pcspkr drm snd k10temp
ecdh_generic soundcore efivars rfkill crc16 sp5100_tco sg ccp
[37342.777514]  rng_core wmi pcc_cpufreq button acpi_cpufreq nct6775 hwmon_vid
parport_pc ppdev lp parport efivarfs ip_tables x_tables autofs4 xfs btrfs xor
zstd_decompress zstd_compress xxhash raid6_pq libcrc32c crc32c_generic
hid_generic usbhid hid sd_mod crc32c_intel ahci xhci_pci libahci aesni_intel
xhci_hcd aes_x86_64 crypto_simd libata igb cryptd glue_helper nvme usbcore
scsi_mod i2c_piix4 i2c_algo_bit nvme_core dca usb_common gpio_amdpt
gpio_generic
[37342.777542] CPU: 4 PID: 14403 Comm: kworker/4:1 Tainted: G        W        
4.19.0-rc3-amd64 #1 Debian 4.19~rc3-1~exp1
[37342.777542] Hardware name: To Be Filled By O.E.M. To Be Filled By
O.E.M./X370 Taichi, BIOS L4.64 04/03/2018
[37342.777558] Workqueue: events drm_mode_rmfb_work_fn [drm]
[37342.777615] RIP: 0010:generic_reg_wait+0xe7/0x160 [amdgpu]
[37342.777617] Code: 44 24 58 8b 54 24 48 89 de 44 89 4c 24 08 48 8b 4c 24 50
48 c7 c7 20 9d b5 c1 e8 64 e6 f0 fe 83 7d 18 01 44 8b 4c 24 08 74 02 <0f> 0b 48
83 c4 10 44 89 c8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 41 0f
[37342.777618] RSP: 0018:ffffa2ae81b9ba20 EFLAGS: 00010297
[37342.777620] RAX: 0000000000000000 RBX: 000000000000000a RCX:
0000000000000000
[37342.777621] RDX: 0000000000000000 RSI: ffff93d74eb166a8 RDI:
ffff93d74eb166a8
[37342.777622] RBP: ffff93d746439180 R08: 0000000000000000 R09:
0000000000010200
[37342.777623] R10: 0720072007200720 R11: 0720073207320739 R12:
0000000000000bb9
[37342.777624] R13: 00000000000051e2 R14: 0000000000010000 R15:
0000000000000000
[37342.777625] FS:  0000000000000000(0000) GS:ffff93d74eb00000(0000)
knlGS:0000000000000000
[37342.777626] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[37342.777627] CR2: 0000558f62bfa9d0 CR3: 00000003f2c38000 CR4:
00000000003406e0
[37342.777628] Call Trace:
[37342.777695]  dce110_stream_encoder_dp_blank+0x12c/0x1a0 [amdgpu]
[37342.777754]  core_link_disable_stream+0x54/0x220 [amdgpu]
[37342.777813]  dce110_reset_hw_ctx_wrap+0xc1/0x1e0 [amdgpu]
[37342.777872]  dce110_apply_ctx_to_hw+0x45/0x650 [amdgpu]
[37342.777928]  ? dc_remove_plane_from_context+0x1fc/0x240 [amdgpu]
[37342.777985]  dc_commit_state+0x2c6/0x520 [amdgpu]
[37342.778047]  amdgpu_dm_atomic_commit_tail+0x37a/0xd80 [amdgpu]
[37342.778052]  ? __wake_up_common_lock+0x89/0xc0
[37342.778054]  ? _cond_resched+0x15/0x30
[37342.778056]  ? wait_for_completion_timeout+0x3b/0x1a0
[37342.778117]  ? amdgpu_dm_atomic_commit_tail+0xd80/0xd80 [amdgpu]
[37342.778126]  commit_tail+0x3d/0x70 [drm_kms_helper]
[37342.778133]  drm_atomic_helper_commit+0xb4/0x120 [drm_kms_helper]
[37342.778148]  drm_framebuffer_remove+0x361/0x410 [drm]
[37342.778164]  drm_mode_rmfb_work_fn+0x4f/0x60 [drm]
[37342.778167]  process_one_work+0x1a7/0x360
[37342.778169]  worker_thread+0x30/0x390
[37342.778171]  ? pwq_unbound_release_workfn+0xd0/0xd0
[37342.778173]  kthread+0x112/0x130
[37342.778175]  ? kthread_bind+0x30/0x30
[37342.778177]  ret_from_fork+0x22/0x40
[37342.778179] ---[ end trace 3d987dd66a59ffb4 ]---

OS: Debian testing, kernel 4.19~rc3-1~exp1
GPU: Sapphire Pulse Vega 56.
amdgpu firmware: 20180825+dfsg-1

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