ast "WARN_ON(!__ast_dp_wait_enable("ast, enabled)) on reboot

ast "WARN_ON(!__ast_dp_wait_enable("ast, enabled)) on reboot

[Nirmoy Das]

[-- Attachment #1: Type: text/plain, Size: 5665 bytes --]

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.

[ 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

[-- Attachment #2: Type: text/html, Size: 8577 bytes --]

Re: ast "WARN_ON(!__ast_dp_wait_enable("ast, enabled)) on reboot

[Thomas Zimmermann]

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?

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)

Re: ast "WARN_ON(!__ast_dp_wait_enable("ast, enabled)) on reboot

[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?


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
>>
>

Re: ast "WARN_ON(!__ast_dp_wait_enable("ast, enabled)) on reboot

[Thomas Zimmermann]

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)

Re: ast "WARN_ON(!__ast_dp_wait_enable("ast, enabled)) on reboot

[Carol Soto]

[-- Attachment #1: Type: text/plain, Size: 7574 bytes --]

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.

Carol

From: Thomas Zimmermann <tzimmermann@suse.de>
Date: Tuesday, September 23, 2025 at 4:41 AM
To: Nirmoy Das <nirmoyd@nvidia.com>, KuoHsiang Chou <kuohsiang_chou@aspeedtech.com>
Cc: dri-devel@lists.freedesktop.org <dri-devel@lists.freedesktop.org>, Carol Soto <csoto@nvidia.com>, Matt Ochs <mochs@nvidia.com>
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)


[-- Attachment #2: Type: text/html, Size: 11386 bytes --]

Re: ast "WARN_ON(!__ast_dp_wait_enable("ast, enabled)) on reboot

[Thomas Zimmermann]

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 <tzimmermann@suse.de>
> *Date: *Tuesday, September 23, 2025 at 4:41 AM
> *To: *Nirmoy Das <nirmoyd@nvidia.com>, KuoHsiang Chou 
> <kuohsiang_chou@aspeedtech.com>
> *Cc: *dri-devel@lists.freedesktop.org 
> <dri-devel@lists.freedesktop.org>, Carol Soto <csoto@nvidia.com>, Matt 
> Ochs <mochs@nvidia.com>
> *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)

Re: ast "WARN_ON(!__ast_dp_wait_enable("ast, enabled)) on reboot

[Carol Soto]

[-- Attachment #1: Type: text/plain, Size: 8887 bytes --]

From dmesg we see this:

[   35.845199] ast 0008:04:00.0: [drm] Using ASPEED DisplayPort transmitter


From: Thomas Zimmermann <tzimmermann@suse.de>
Date: Tuesday, September 23, 2025 at 10:35 AM
To: Carol Soto <csoto@nvidia.com>, Nirmoy Das <nirmoyd@nvidia.com>, KuoHsiang Chou <kuohsiang_chou@aspeedtech.com>
Cc: dri-devel@lists.freedesktop.org <dri-devel@lists.freedesktop.org>, Matt Ochs <mochs@nvidia.com>
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 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 <tzimmermann@suse.de>
> *Date: *Tuesday, September 23, 2025 at 4:41 AM
> *To: *Nirmoy Das <nirmoyd@nvidia.com>, KuoHsiang Chou
> <kuohsiang_chou@aspeedtech.com>
> *Cc: *dri-devel@lists.freedesktop.org
> <dri-devel@lists.freedesktop.org>, Carol Soto <csoto@nvidia.com>, Matt
> Ochs <mochs@nvidia.com>
> *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)


[-- Attachment #2: Type: text/html, Size: 14334 bytes --]

Re: ast "WARN_ON(!__ast_dp_wait_enable("ast, enabled)) on reboot

[Thomas Zimmermann]

Hi

Am 23.09.25 um 17:36 schrieb Carol Soto:
>
> From dmesg we see this:
>
> [ 35.845199] ast 0008:04:00.0: [drm] Using ASPEED DisplayPort transmitter
>

Sure, it detects DP, but do you also connect the monitor via 
DisplayPort? I'm asking because the DP code always seemed fragile and 
there seem to be devices that have both ports, DP and VGA, with no way 
of detecting VGA.

Best regards
Thomas

> *From: *Thomas Zimmermann <tzimmermann@suse.de>
> *Date: *Tuesday, September 23, 2025 at 10:35 AM
> *To: *Carol Soto <csoto@nvidia.com>, Nirmoy Das <nirmoyd@nvidia.com>, 
> KuoHsiang Chou <kuohsiang_chou@aspeedtech.com>
> *Cc: *dri-devel@lists.freedesktop.org 
> <dri-devel@lists.freedesktop.org>, Matt Ochs <mochs@nvidia.com>
> *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 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 <tzimmermann@suse.de>
> > *Date: *Tuesday, September 23, 2025 at 4:41 AM
> > *To: *Nirmoy Das <nirmoyd@nvidia.com>, KuoHsiang Chou
> > <kuohsiang_chou@aspeedtech.com>
> > *Cc: *dri-devel@lists.freedesktop.org
> > <dri-devel@lists.freedesktop.org>, Carol Soto <csoto@nvidia.com>, Matt
> > Ochs <mochs@nvidia.com>
> > *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)
>

-- 
--
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)

Re: ast "WARN_ON(!__ast_dp_wait_enable("ast, enabled)) on reboot

[Nirmoy Das]

Hi Thomas,

On 23.09.25 18:46, Thomas Zimmermann wrote:
> Hi
>
> Am 23.09.25 um 17:36 schrieb Carol Soto:
>>
>> From dmesg we see this:
>>
>> [ 35.845199] ast 0008:04:00.0: [drm] Using ASPEED DisplayPort 
>> transmitter
>>
>
> Sure, it detects DP, but do you also connect the monitor via DisplayPort? 

It is a remote machine so it will be hard to physically verify but 
looking into the state file. I see that the display is indeed connected 
to a DP port.
cat  /sys/kernel/debug/dri/0008\:04\:00.0/state
plane[32]: plane-0
         crtc=crtc-0
         fb=39
                 allocated by = [fbcon]
                 refcount=2
                 format=XR24 little-endian (0x34325258)
                 modifier=0x0
                 size=640x480
                 layers:
                         size[0]=640x480
                         pitch[0]=2560
                         offset[0]=0
                         obj[0]:
                                 name=0
                                 refcount=2
                                 start=00010000
                                 size=1245184
                                 imported=no
                                 pages_use_count=2
                                 vmap_use_count=2
                                 vaddr=0000000051d78cc3
         crtc-pos=640x480+0+0
         src-pos=640.000000x480.000000+0.000000+0.000000
         rotation=1
         normalized-zpos=0
         color-encoding=ITU-R BT.601 YCbCr
         color-range=YCbCr limited range
         color_mgmt_changed=0
plane[34]: plane-1
         crtc=(null)
         fb=0
         crtc-pos=0x0+0+0
         src-pos=0.000000x0.000000+0.000000+0.000000
         rotation=1
         normalized-zpos=0
         color-encoding=ITU-R BT.601 YCbCr
         color-range=YCbCr limited range
         color_mgmt_changed=0
crtc[36]: crtc-0
         enable=1
         active=1
         self_refresh_active=0
         planes_changed=1
         mode_changed=0
         active_changed=0
         connectors_changed=0
         color_mgmt_changed=0
         plane_mask=1
         connector_mask=1
         encoder_mask=1
         mode: "640x480": 60 25175 640 656 752 800 480 490 492 525 0x48 0xa
connector[38]: DP-1
         crtc=crtc-0
         self_refresh_aware=0
         interlace_allowed=0
         ycbcr_420_allowed=0
         max_requested_bpc=0
         colorspace=Default


Regards,

Nirmoy

> I'm asking because the DP code always seemed fragile and there seem to 
> be devices that have both ports, DP and VGA, with no way of detecting 
> VGA.
>
> Best regards
> Thomas
>
>> *From: *Thomas Zimmermann <tzimmermann@suse.de>
>> *Date: *Tuesday, September 23, 2025 at 10:35 AM
>> *To: *Carol Soto <csoto@nvidia.com>, Nirmoy Das <nirmoyd@nvidia.com>, 
>> KuoHsiang Chou <kuohsiang_chou@aspeedtech.com>
>> *Cc: *dri-devel@lists.freedesktop.org 
>> <dri-devel@lists.freedesktop.org>, Matt Ochs <mochs@nvidia.com>
>> *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 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 <tzimmermann@suse.de>
>> > *Date: *Tuesday, September 23, 2025 at 4:41 AM
>> > *To: *Nirmoy Das <nirmoyd@nvidia.com>, KuoHsiang Chou
>> > <kuohsiang_chou@aspeedtech.com>
>> > *Cc: *dri-devel@lists.freedesktop.org
>> > <dri-devel@lists.freedesktop.org>, Carol Soto <csoto@nvidia.com>, Matt
>> > Ochs <mochs@nvidia.com>
>> > *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)
>>
>