Re: [PATCH RFC] more progress with radeon on C8000

[John David Anglin <dave.anglin@bell.net>]

On 2023-05-16 4:48 p.m., Helge Deller wrote:
> * Helge Deller<deller@gmx.de>:
>> There have been various approaches to fix the radeon graphic cards
>> on C8000 workstations, e.g. this is the last thread:
>> https://marc.info/?l=linux-parisc&m=156971832128700&w=2
>>
>> With the patch below the radeon ring and ib tests don't fail any longer.
>> It uses (relatively) lightweight pdc/fdc instructions.
>>
>> The patch below
>> - uses the pdc instruction (purge data cache) before reading back the
>>    ring test result from memory.
>> - modifies the parisc-agp code, based on Thomas patch
>>
>> The patch is not intended to by applied as-is.
> attached is a cleaned up version of the patch.
I tried this change on c8000 with kernel 6.3.3:

[   89.531274] drm_kms_helper alternatives: applied 0 out of 27 patches
[   89.630885] ipmi_si alternatives: applied 0 out of 8 patches
[   89.731041] ipmi_si: IPMI System Interface driver
[   89.821872] drm_display_helper alternatives: applied 0 out of 6 patches
[   89.833885] ipmi_si: Adding device-tree-specified kcs state machine
[   89.971367] ipmi_si: Trying device-tree-specified kcs state machine at mem address 0xfffffff0f05b0000, slave address 0x0, irq 0
[   90.271358] ttm alternatives: applied 0 out of 13 patches
[   90.421083] drm_ttm_helper alternatives: applied 0 out of 2 patches
[   90.881506] radeon alternatives: applied 0 out of 4803 patches
[   90.980838] [drm] radeon kernel modesetting enabled.
[   91.041955] [drm] initializing kernel modesetting (RV350 0x1002:0x4154 0x1002:0x0002 0x80).
[   91.140773] [drm] Forcing AGP to PCI mode
[   91.290915] [drm] GPU not posted. posting now...
[   91.551801] [drm] Generation 2 PCI interface, using max accessible memory
[   91.620801] radeon 0000:80:00.0: VRAM: 128M 0xFFFFFFFFC0000000 - 0xFFFFFFFFC7FFFFFF (128M used)
[   91.671141] ipmi 16: IPMI message handler: Found new BMC (man_id: 0x00000b, prod_id: 0x8201, dev_id: 0x32)
[   91.710747] radeon 0000:80:00.0: GTT: 512M 0xFFFFFFFFA0000000 - 0xFFFFFFFFBFFFFFFF
[   91.814064] ipmi 16: IPMI kcs interface initialized
[   91.880842] [drm] Detected VRAM RAM=128M, BAR=128M
[   91.970765] [drm] RAM width 128bits DDR
[   91.971192] [drm] radeon: 128M of VRAM memory ready
[   92.050830] [drm] radeon: 512M of GTT memory ready.
[   92.110946] [drm] GART: num cpu pages 131072, num gpu pages 131072
[   92.222903] [drm] radeon: 1 quad pipes, 1 Z pipes initialized
[   92.290747] [drm] PCI GART of 512M enabled (table at 0x0000000047040000).
[   92.370907] radeon 0000:80:00.0: WB enabled
[   92.431273] radeon 0000:80:00.0: fence driver on ring 0 use gpu addr 0xffffffffa0000000
[   92.531273] [drm] radeon: irq initialized.
[   92.560906] [drm] Loading R300 Microcode
[   92.631141] radeon 0000:80:00.0: Direct firmware load for radeon/R300_cp.bin failed with error -2
[   92.743052] radeon_cp: Failed to load firmware "radeon/R300_cp.bin"
[   92.819159] [drm:r100_cp_init [radeon]] *ERROR* Failed to load firmware!
[   92.890738] radeon 0000:80:00.0: failed initializing CP (-2).
[   92.960765] radeon 0000:80:00.0: Disabling GPU acceleration
[   93.030744] [drm] radeon: cp finalized
[   93.142149] [drm] Radeon Display Connectors
[   93.170762] [drm] Connector 0:
[   93.170771] [drm]   VGA-1
[   93.170775] [drm]   DDC: 0x60 0x60 0x60 0x60 0x60 0x60 0x60 0x60
[   93.170786] [drm]   Encoders:
[   93.290760] [drm]     CRT1: INTERNAL_DAC1
[   93.340770] [drm] Connector 1:
[   93.380749] [drm]   DVI-I-1
[   93.410745] [drm]   HPD1
[   93.440846] [drm]   DDC: 0x64 0x64 0x64 0x64 0x64 0x64 0x64 0x64
[   93.520737] [drm]   Encoders:
[   93.559678] [drm]     CRT2: INTERNAL_DAC2
[   93.590733] [drm]     DFP1: INTERNAL_TMDS1
[   93.853779] [drm] fb mappable at 0xFFFFFFFFC0040000
[   93.900758] [drm] vram apper at 0xFFFFFFFFC0000000
[   93.940732] [drm] size 5242880
[   93.960731] [drm] fb depth is 24
[   93.981757] [drm]    pitch is 5120
[   94.080657] Console: switching to colour frame buffer device 160x64
[   94.290810] radeon 0000:80:00.0: [drm] fb0: radeondrmfb frame buffer device
[   94.420892] [drm] Initialized radeon 2.50.0 20080528 for 0000:80:00.0 on minor 0

80:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV350 GL [FireGL T2] (rev 80) (prog-if 00 [VGA controller])
         Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] RV350 GL [FireGL T2]
         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
         Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
         Latency: 192 (2000ns min), Cache Line Size: 128 bytes
         Interrupt: pin A routed to IRQ 75
         Region 0: Memory at ffffffffc0000000 (32-bit, prefetchable) [size=128M]
         Region 1: I/O ports at 3c000 [size=256]
         Region 2: Memory at ffffffffc8020000 (32-bit, non-prefetchable) [size=64K]
         Expansion ROM at ffffffffc8000000 [disabled] [size=128K]
         Capabilities: <access denied>
         Kernel driver in use: radeon
         Kernel modules: radeon

Firmware still fails to load and acceleration is disabled.  Maybe this is also a cache flush issue?

FB console looks okay.

This is a significant advance 😁

Dave

-- 
John David Anglin  dave.anglin@bell.net