Radeon drivers on PowerPC (e500)

[Martyn Welch]

On 18/06/14 02:05, Dave Airlie wrote:
> On 18 June 2014 05:14, Martyn Welch <martyn.welch at ge.com> wrote:
>> Hi,
>>
>> I've been asked to try and get a r600 based (E6460) graphics card running on
>> a machine powered by a Freescale p4080 (e500 core). I've run into a bit of a
>> problem.
>>
>> I have the driver built into the kernel at this point. When I boot the card
>> is detected and it seems to be finding the fimware (I'm also building in the
>> required firmware blobs), but I get the following messages:
>>
>> [drm] Initialized drm 1.1.0 20060810
>> [drm] radeon defaulting to kernel modesetting.
>> [drm] radeon kernel modesetting enabled.
>> [drm] initializing kernel modesetting (CAICOS 0x1002:0x6763 0x1775:0xC6A7).
>> [drm] register mmio base: 0x10000000
>> [drm] register mmio size: 131072
>> ATOM BIOS: GE
>> [drm] GPU not posted. posting now...
>> radeon 0000:04:00.0: VRAM: 512M 0x0000000000000000 - 0x000000001FFFFFFF
>> (512M used)
>> radeon 0000:04:00.0: GTT: 512M 0x0000000020000000 - 0x000000003FFFFFFF
>> [drm] Detected VRAM RAM=512M, BAR=256M
>> [drm] RAM width 64bits DDR
>> [TTM] Zone  kernel: Available graphics memory: 338754 kiB
>> [TTM] Zone highmem: Available graphics memory: 994110 kiB
>> [TTM] Initializing pool allocator
>> [TTM] Initializing DMA pool allocator
>> [drm] radeon: 512M of VRAM memory ready
>> [drm] radeon: 512M of GTT memory ready.
>> [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
>> [drm] Driver supports precise vblank timestamp query.
>> radeon 0000:04:00.0: radeon: using MSI.
>> [drm] radeon: irq initialized.
>> [drm] GART: num cpu pages 131072, num gpu pages 131072
>> [drm] probing gen 2 caps for device 111d:808a = 2/0
>> [drm] enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0
>> [drm] Loading CAICOS Microcode
>> __ioremap_caller(140000, 4096, 4194304, c02eab20)__ioremap(): phys addr
>> 0x140000 is RAM lr ttm_bo_kmap
>> radeon 0000:04:00.0: disabling GPU acceleration
>> radeon 0000:04:00.0: e957e400 unpin not necessary
>> radeon 0000:04:00.0: e957e400 unpin not necessary
>> [drm] Radeon Display Connectors
>> [drm] Connector 0:
>> [drm]   DP-1
>> [drm]   HPD2
>> [drm]   HPD3
>> [drm]   DDC: 0x6450 0x6450 0x6454 0x6454 0x6458 0x6458 0x645c 0x645c
>> [drm]   Encoders:
>> [drm]     DFP2: INTERNAL_UNIPHY1
>> [drm] Connector 2:
>> [drm]   DVI-I-1
>> [drm]   HPD1
>> [drm]   DDC: 0x6430 0x6430 0x6434 0x6434 0x6438 0x6438 0x643c 0x643c
>> [drm]   Encoders:
>> [drm]     DFP3: INTERNAL_UNIPHY
>> [drm]     CRT1: INTERNAL_KLDSCP_DAC1
>> [drm] Internal thermal controller with fan control
>> [drm] radeon: power management initialized
>> __ioremap_caller(141000, 5242880, 4194304, c02eab20)__ioremap(): phys addr
>> 0x141000 is RAM lr ttm_bo_kmap
>> [drm:radeonfb_create] *ERROR* failed to create fbcon object -12
>> [drm] Initialized radeon 2.29.0 20080528 for 0000:04:00.0 on minor 0
>>
>> There are failed attempts to ioremap RAM, initially as part of
>> r600_vram_scratch_init() and again I guess mapping the GART?
>>
>> On the e500, overlapping TLBs are not allowed and there is an explict check
>> in arch/powerpc/mm/pgtable_32.c __ioremap_caller() to protect against
>> ioremapping RAM that's already got TLB entries which is resulting in the
>> error messages.
>
> I don't think we ever ioremap GART, it should kmap GART pages, ioremap
> should only happen for VRAM areas AFAIK,
>

Ah, quite possibly, I hadn't looked in any depth further than the 
initial failure with r600_vram_scratch_init() as that was going to be a 
bit of a blocker.

> This isn't some 32-bit vs 36-bit BAR or something, I seem to remember BenH
> mentioning something like that before.
>

Thanks Dave.

Martyn

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