Hi
Am 23.09.25 um 17:31 schrieb Carol Soto:
I think this call was failing in this system for 6.8 kernel. The
difference is that now is a WARN_ON so we see the stack trace at
reboot with 6.14 and above kernels.
OK. Just to clarify: your system does use an Aspeed DisplayPort? There
are also systems with VGA port.
Best regards
Thomas
Carol
*From: *Thomas Zimmermann <[email protected]>
*Date: *Tuesday, September 23, 2025 at 4:41 AM
*To: *Nirmoy Das <[email protected]>, KuoHsiang Chou
<[email protected]>
*Cc: *[email protected]
<[email protected]>, Carol Soto <[email protected]>, Matt
Ochs <[email protected]>
*Subject: *Re: ast "WARN_ON(!__ast_dp_wait_enable("ast, enabled)) on
reboot
External email: Use caution opening links or attachments
Hi
Am 23.09.25 um 11:25 schrieb Nirmoy Das:
>
> On 23.09.25 11:15, Thomas Zimmermann wrote:
>> Hi
>>
>> Am 23.09.25 um 10:34 schrieb Nirmoy Das:
>>>
>>> Hi Thomas and KuoHsiang
>>>
>>>
>>> (Not sure if there is separate portal to report AST issues. Let me
>>> know if there is one)
>>>
>>> We are observing the following trace on every reboot. I tried
>>> increasing the timeout value but that did not resolve the issue.
>>>
>>> I tried to read AST_IO_VGACRI(0xdf) and AST_IO_VGACRI(0xe3) which
>>> returns a value of 0xff. I wonder if
>>>
>>> the device is accessible at pci_device_shutdown().
>>>
>>> I have attached the lspci output for your review. Please let me
>>> know if you have some ideas how to debug/fix this.
>>>
>>
>> Is that a new problem? I occasionally refactor parts of the driver.
>> It could happen that an older version works?
>
>
> We saw this on 6.14 and 6.16 so I think it is not a new issue. Should
> we try out more older kernel?
If you can. The DP code got added in v5.19 by commit 594e9c04b586
("drm/ast: Create the driver for ASPEED proprietory Display-Port").
Best regards
Thomas
>
>
> Regards,
>
> Nirmoy
>
>>
>> Best regards
>> Thomas
>>
>>> [ 196.248014] ast 0008:02:00.0: [drm]
>>> drm_WARN_ON(!__ast_dp_wait_enable(ast, enabled)) [ 196.248045]
>>> WARNING: CPU: 76 PID: 1 at drivers/gpu/drm/ast/ast_dp.c:282
>>> ast_dp_set_enable+0x124/0x158 [ast] [ 196.277550] Modules linked in:
>>> bcache qrtr cfg80211 binfmt_misc cdc_subset ast dax_hmem
>>> drm_shmem_helper cxl_acpi drm_client_lib cxl_port i2c_algo_bit
>>> cxl_core ipmi_ssif drm_kms_helper uio_pdrv_genirq uio coresight_trbe
>>> arm_spe_pmu arm_cspmu_module arm_smmuv3_pmu spi_nor mtd
>>> coresight_funnel acpi_power_meter acpi_ipmi coresight_etm4x
>>> coresight ipmi_msghandler dm_multipath efi_pstore drm nfnetlink
>>> ip_tables x_tables autofs4 overlay isofs nls_iso8859_1 raid10
>>> raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx
>>> xor xor_neon raid6_pq raid1 raid0 linear mlx5_ib ib_uverbs ib_core
>>> mlx5_core ghash_ce sm4_ce_cipher sm4 sm3_ce mlxfw sha3_ce psample
>>> i2c_smbus sha512_ce nvme tls sha1_ce arm_smccc_trng nvme_core
>>> pci_hyperv_intf spi_tegra210_quad dax_pmem i2c_tegra cdc_ether
>>> usbnet aes_neon_bs aes_neon_blk aes_ce_blk aes_ce_cipher [last
>>> unloaded: ipmi_devintf] [ 196.355667] CPU: 76 UID: 0 PID: 1 Comm:
>>> shutdown Tainted: G W 6.16.4-dev-main-nvidia-pset-linux-6-generic
>>> #16+f4490439 PREEMPT(none) [ 196.369453] Tainted: [W]=WARN [
>>> 196.372481] Hardware name: NVIDIA Grace CPU P5041/P3880, BIOS
>>> FF.04.00 20250422 [ 196.379955] pstate: 63400009 (nZCv daif +PAN
>>> -UAO +TCO +DIT -SSBS BTYPE=--) [ 196.387073] pc :
>>> ast_dp_set_enable+0x124/0x158 [ast] [ 196.392148] lr :
>>> ast_dp_set_enable+0x124/0x158 [ast] [ 196.397221] sp :
>>> ffff80008049b930 [ 196.400604] x29: ffff80008049b930 x28:
>>> ffffa507dbec1b98 x27: ffff0000acb337b8 [ 196.407901] x26:
>>> 0000000000000000 x25: ffff1003985d2e00 x24: ffffa507dbdc45b8 [
>>> 196.415197] x23: 0000000000000000 x22: 0000000000418958 x21:
>>> 00000000ffffffdf [ 196.422495] x20: ffff100008bac0c8 x19:
>>> 0000000000000000 x18: 000000000000004c [ 196.429790] x17:
>>> ffff100008b5f200 x16: ffffa508522b5ce8 x15: 0000000000000000 [
>>> 196.437087] x14: 0000000000000000 x13: 2d2d2d2d2d2d2d2d x12:
>>> 2d2d2d2d5d206572 [ 196.444384] x11: 656820747563205b x10:
>>> 0000000000000020 x9 : ffffa508523621cc [ 196.451681] x8 :
>>> 00000000ffffffff x7 : 0000000000000030 x6 : 0000000005000000 [
>>> 196.458976] x5 : 000000000000004d x4 : 00000000000000c0 x3 :
>>> 0000000000000003 [ 196.466271] x2 : 0000000000000000 x1 :
>>> 0000000000000000 x0 : ffff000081356040 [ 196.473566] Call trace: [
>>> 196.476061] ast_dp_set_enable+0x124/0x158 [ast] (P) [ 196.481135]
>>> ast_astdp_encoder_helper_atomic_disable+0x28/0x90 [ast] [
>>> 196.487630] disable_outputs+0x11c/0x3c8 [drm_kms_helper] [
>>> 196.493160] drm_atomic_helper_commit_tail+0x2c/0xb0 [drm_kms_helper]
>>> [ 196.499753] ast_mode_config_helper_atomic_commit_tail+0x34/0x58
>>> [ast] [ 196.506427] commit_tail+0xd8/0x220 [drm_kms_helper] [
>>> 196.511503] drm_atomic_helper_commit+0x174/0x190 [drm_kms_helper] [
>>> 196.517824] drm_atomic_commit+0x94/0xe0 [drm] [ 196.522392]
>>> drm_atomic_helper_disable_all+0x204/0x220 [drm_kms_helper] [
>>> 196.529158] drm_atomic_helper_shutdown+0x90/0x158 [drm_kms_helper] [
>>> 196.535567] ast_pci_shutdown+0x1c/0x30 [ast] [ 196.540020]
>>> pci_device_shutdown+0x3c/0xa8 [ 196.544216]
>>> device_shutdown+0x140/0x2b0 [ 196.548229] kernel_restart+0x4c/0xb8 [
>>> 196.551974] __do_sys_reboot+0x148/0x260 [ 196.555979]
>>> __arm64_sys_reboot+0x2c/0x40 [ 196.560074] invoke_syscall+0x70/0x100
>>> [ 196.563907] el0_svc_common.constprop.0+0x48/0xf8 [ 196.568712]
>>> do_el0_svc+0x28/0x40 [ 196.572097] el0_svc+0x34/0xd8 [ 196.575220]
>>> el0t_64_sync_handler+0x144/0x168 [ 196.579670]
>>> el0t_64_sync+0x1b0/0x1b8 [ 196.583411] ---[ end trace
>>> 0000000000000000 ]--- [ 196.656701] reboot: Restarting system
>>>
>>> lspci:
>>>
>>> 0008:03:00.0 PCI bridge: ASPEED Technology, Inc. AST1150 PCI-to-PCI
>>> Bridge (rev 06) (prog-if 00 [Normal decode]) Subsystem: ASPEED
>>> Technology, Inc. AST1150 PCI-to-PCI Bridge Physical Slot: 2-1 Flags:
>>> bus master, fast devsel, latency 0, NUMA node 0, IOMMU group 24 Bus:
>>> primary=03, secondary=04, subordinate=04, sec-latency=0 I/O behind
>>> bridge: 40000-40fff [size=4K] [16-bit] Memory behind bridge:
>>> 40000000-410fffff [size=17M] [32-bit] Prefetchable memory behind
>>> bridge: [disabled] [64-bit] Capabilities: [40] Power Management
>>> version 3 Capabilities: [68] Express PCI-Express to PCI/PCI-X
>>> Bridge, MSI 00 Capabilities: [b0] Subsystem: ASPEED Technology, Inc.
>>> AST1150 PCI-to-PCI Bridge Capabilities: [e0] Vendor Specific
>>> Information: Len=20 <?> Capabilities: [100] Device Serial Number
>>> 00-80-5e-00-00-10-0b-b0 Capabilities: [10c] Secondary PCI Express
>>> Capabilities: [150] Virtual Channel Capabilities: [1e0] Vendor
>>> Specific Information: ID=0001 Rev=2 Len=010 <?> Capabilities: [1f0]
>>> Advanced Error Reporting 0008:04:00.0 VGA compatible controller:
>>> ASPEED Technology, Inc. ASPEED Graphics Family (rev 52) (prog-if 00
>>> [VGA controller]) DeviceName: Embedded Video Controller Subsystem:
>>> ASPEED Technology, Inc. ASPEED Graphics Family !!! Unknown header
>>> type 7f Memory at 650040000000 (32-bit, non-prefetchable) [size=16M]
>>> Memory at 650041000000 (32-bit, non-prefetchable) [size=256K] I/O
>>> ports at 40000 [size=128] Kernel driver in use: ast Kernel
modules: ast
>>>
>>
--
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)
--
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)
