v6.11-rc4 amdgpu regression from v6.10.0

[Andrew Worsley]

The v6.11-rc4 linux hangs during amdgpu start up where as the v6.10.0
is fine. I had to take a photo of the screen (see attachment) from
which I generated
the following summary:

    Booting linux v6.11-rc4 :
...
amdgpu: Virtual CRAT table created for CPU
amdgpu: Topology: Add CPU node
initializing kernel modesetting (IP DISCOVERY 0x1002:0x15BF 0xF111:0x0005 0xC2).
register mmio base: 0x90500000
register mmio size: 524288
add ip block number 0 <soc21_common>
add ip block number 1 <gmc_v11_0>
add ip block number 2 <ih_v6_0>
add ip block number 3 <psp>
add ip block number 4 <smu>
add ip block number 5 <dm>
add ip block number 6 <gfx_v11_0>
add ip block number 7 <sdma_v6_0>
add ip block number 8 <vcn_v4_0>
add ip block number 9 <jpeg_v4_0>
add ip block number 10 <mes_v11_0>
amdgpu 0000:c1:00.0: amdgpu: Fetched VBIOS from VFCT
amdgpu: ATOM BIOS: 113-PHXGENERIC-001
amdgpu 0000:c1:00.0: Direct firmware load for
amdgpu/gc_11_0_1_mes_2.bin failed with error -2
amdgpu 0000:c1:00.0: amdgpu: try to fall back to amdgpu/gc_11_0_1_mes.bin

  *** Hangs with this displayed on the console ****
    - have to power off computer to recover

Perfectly successful boot with v6.10.0 kernel :

[    2.478302] [drm] amdgpu kernel modesetting enabled.
[    2.485206] amdgpu: Virtual CRAT table created for CPU
[    2.485817] amdgpu: Topology: Add CPU node
[    2.486525] [drm] initializing kernel modesetting (IP DISCOVERY
0x1002:0x15BF 0xF111:0x0005 0xC2).
[    2.487225] [drm] register mmio base: 0x90500000
[    2.487809] [drm] register mmio size: 524288
[    2.492629] [drm] add ip block number 0 <soc21_common>
[    2.493310] [drm] add ip block number 1 <gmc_v11_0>
[    2.493973] [drm] add ip block number 2 <ih_v6_0>
[    2.494617] [drm] add ip block number 3 <psp>
[    2.495255] [drm] add ip block number 4 <smu>
[    2.495880] [drm] add ip block number 5 <dm>
[    2.496499] [drm] add ip block number 6 <gfx_v11_0>
[    2.497114] [drm] add ip block number 7 <sdma_v6_0>
[    2.497717] [drm] add ip block number 8 <vcn_v4_0>
[    2.498313] [drm] add ip block number 9 <jpeg_v4_0>
[    2.498899] [drm] add ip block number 10 <mes_v11_0>
[    2.499479] amdgpu 0000:c1:00.0: amdgpu: Fetched VBIOS from VFCT
[    2.500063] amdgpu: ATOM BIOS: 113-PHXGENERIC-001
[    2.501760] [drm] VCN(0) encode/decode are enabled in VM mode
[    2.502588] amdgpu 0000:c1:00.0: [drm:jpeg_v4_0_early_init
[amdgpu]] JPEG decode is enabled in VM mode
[    2.503426] amdgpu 0000:c1:00.0: Direct firmware load for
amdgpu/gc_11_0_1_mes_2.bin failed with error -2
[    2.504043] [drm] try to fall back to amdgpu/gc_11_0_1_mes.bin
[    2.505117] Console: switching to colour dummy device 80x25
[    2.505144] amdgpu 0000:c1:00.0: vgaarb: deactivate vga console
[    2.505147] amdgpu 0000:c1:00.0: amdgpu: Trusted Memory Zone (TMZ)
feature enabled
[    2.505193] [drm] vm size is 262144 GB, 4 levels, block size is
9-bit, fragment size is 9-bit
[    2.505218] amdgpu 0000:c1:00.0: amdgpu: VRAM: 2048M
0x0000008000000000 - 0x000000807FFFFFFF (2048M used)
[    2.505223] amdgpu 0000:c1:00.0: amdgpu: GART: 512M
0x00007FFF00000000 - 0x00007FFF1FFFFFFF
[    2.505237] [drm] Detected VRAM RAM=2048M, BAR=2048M
[    2.505240] [drm] RAM width 128bits DDR5
[    2.505418] [drm] amdgpu: 2048M of VRAM memory ready
[    2.505422] [drm] amdgpu: 31048M of GTT memory ready.
[    2.505436] [drm] GART: num cpu pages 131072, num gpu pages 131072
[    2.505600] [drm] PCIE GART of 512M enabled (table at 0x000000807FD00000).
[    2.506246] [drm] Loading DMUB firmware via PSP: version=0x08000500
[    2.506550] [drm] Found VCN firmware Version ENC: 1.10 DEC: 5 VEP:
0 Revision: 0
[    2.506558] amdgpu 0000:c1:00.0: amdgpu: Will use PSP to load VCN firmware
[    2.531970] amdgpu 0000:c1:00.0: amdgpu: reserve 0x4000000 from
0x8078000000 for PSP TMR
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