linux-kernel - Re: Revert 737a3bb9416ce2a7c7a4170852473a4fcc9c67e8 ?

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Date:	Mon, 11 Apr 2011 17:32:43 +0200
From:	Michel Dänzer <michel@...nzer.net>
To:	Gabriel Paubert <paubert@...m.es>
Cc:	dri-devel@...ts.freedesktop.org, Dave Airlie <airlied@...il.com>,
	Greg KH <greg@...ah.com>, linuxppc-dev@...ts.ozlabs.org,
	LKML <linux-kernel@...r.kernel.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: Revert 737a3bb9416ce2a7c7a4170852473a4fcc9c67e8 ?

[ Adding the dri-devel list ]

On Mon, 2011-04-11 at 15:31 +0200, Gabriel Paubert wrote: 
> On Thu, Apr 07, 2011 at 04:04:35PM +0200, Michel Dänzer wrote:
> > On Mit, 2011-04-06 at 22:43 +0200, Gabriel Paubert wrote: 
> > > 
> > > The probem is that, at least on one of my machines, the new driver
> > > does not work: the system hangs (apparently solid, but it's before
> > > networking starts up and I've not yet hooked up a serial console), 
> > > after the "radeon: ib pool ready" message.
> > 
> > Does radeon.agpmode=-1 radeon.no_wb=1 help?
> > 
> > You might be able to get more information via netconsole if you prevent
> > the radeon module from loading automatically (or load it with
> > radeon.modeset=0 first) and then load it e.g. via ssh with modeset=1.
> 
> Loading the module with modeset=1 results in insmod blocked in
> kernel state (not consuming CPU cycles either). The last kernel 
> message is always the same (ib pool ready). This seems to be 
> independent of agpmode and no_wb. The kernel messages when
> loading the driver are:
> 
> kernel: [drm] radeon kernel modesetting enabled.
> kernel: checking generic (c0000000 140000) vs hw (c0000000 10000000)
> kernel: fb: conflicting fb hw usage radeondrmfb vs OFfb vga,Displa - removing generic driver
> kernel: [drm] initializing kernel modesetting (RV530 0x1002:0x71C7).
> kernel: radeon 0000:f1:00.0: Using 64-bit DMA iommu bypass
> kernel: [drm] register mmio base: 0xE8000000
> kernel: [drm] register mmio size: 65536
> kernel: radeon 0000:f1:00.0: Invalid ROM contents
> kernel: ATOM BIOS: X1650PRO
> kernel: [drm] Generation 2 PCI interface, using max accessible memory
> kernel: radeon 0000:f1:00.0: VRAM: 512M 0x0000000000000000 - 0x000000001FFFFFFF (512M used)
> kernel: radeon 0000:f1:00.0: GTT: 512M 0x0000000020000000 - 0x000000003FFFFFFF
> kernel: [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
> kernel: [drm] Driver supports precise vblank timestamp query.
> kernel: irq: irq 9 on host /mpic mapped to virtual irq 24
> kernel: u3msi: allocated virq 0x18 (hw 0x9) addr 0xf8004090
> kernel: radeon 0000:f1:00.0: radeon: using MSI.

Have you ruled out any MSI related problems? I think the IRQ not working
could explain the symptoms...

> kernel: [drm] radeon: irq initialized.
> kernel: [drm] Detected VRAM RAM=512M, BAR=256M
> kernel: [drm] RAM width 128bits DDR
> kernel: [TTM] Zone  kernel: Available graphics memory: 1002914 kiB.
> kernel: [TTM] Initializing pool allocator.
> kernel: [drm] radeon: 512M of VRAM memory ready
> kernel: [drm] radeon: 512M of GTT memory ready.
> kernel: [drm] GART: num cpu pages 131072, num gpu pages 131072
> kernel: [drm] radeon: 1 quad pipes, 2 z pipes initialized.
> kernel: [drm] PCIE GART of 512M enabled (table at 0x00040000).
> kernel: radeon 0000:f1:00.0: WB enabled

Make sure this line changes to 'WB disabled' with no_wb=1. There's a
writeback endianness bug with modeset=1, see
http://lists.freedesktop.org/archives/dri-devel/2011-April/009960.html .

> kernel: [drm] Loading R500 Microcode
> kernel: [drm] radeon: ring at 0x0000000020001000
> kernel: [drm] ring test succeeded in 6 usecs
> kernel: [drm] radeon: ib pool ready.


> For now, with modeset=0, agpmode=-1 and no_wb=1, the driver
> seems to work.

The agpmode and no_wb options only have an effect with modeset=1, and
you don't seem to be using AGP anyway. :)


-- 
Earthling Michel Dänzer           |                http://www.vmware.com
Libre software enthusiast         |          Debian, X and DRI developer
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