R600 KMS DRM: no dcc bus report

[Alex Deucher]

On Sun, Jan 16, 2011 at 11:24 AM, Andrea Merello
<andrea.merello at gmail.com> wrote:
> Hello!
> While I was trying (without success) to make KMS work on my PC I saw
> in DMESG a message that asked me to make a report to your mailing
> list:
>
> ([drm]   DDC: no ddc bus - possible BIOS bug - please report to
> xorg-driver-ati at lists.x.org)
>
> So I'm doing this report now, and wolud like to exploit the occasion
> to tell you about another (trivial) thing about the driver firmware
> loading.
>
> Following I report few details about how I got that message:
>
> I have a mainline 2.6.37 and a  RV730 PRO [Radeon HD 4650] PCIexpress card.
>
> What happen here is that without KMS all works (console OK, X OK, DRI
> OK) but with KSM the screen become black during kernel loading.
> By default my system does NOT run X after boot.
>
> I think my monitor is not recognized. it is connected via DVI. The
> card has also a HDMI and a VGA connectors.
>
> Please note that in the log you will also see some messages you will
> not recognize: I have added some printk in the r600.c kernel driver to
> trace initialization flow. I did no any other modification in the
> code.

Is this a Mac card by any chance?  What are the pci subsystem ids for
your card (lspci -vnn)?  The attached patch (against Linus master)
should fix the issue.  If you are using an older kernel, you'll also
need this patch:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=f598aa7593427ffe3a61e7767c34bd695a5e7ed0


>
> I needed to add those to investigate another issue I had (now
> resolved) with this driver related to firmware loading:
> The problem was that I had no any diagnostic message when a microcode
> file was missing (r700_rlc.bin)
>
> Can I suggest you to add some printk when request_firmware fails? I
> think this can be very helpful in order to help to individuate this
> kind of problem and to individuate the specific file that is missing.
>
> The "goto out" branch for failing firmware_request printed nothing..
> The system simply hung (the screen was still showing the latest good
> image with readable kernel message "Loading RV730 microcode") without
> giving any other hint.
>

The kernel has a 2 minute timeout or something like that when looking
for firmware.

Alex

> If you need some other info, or if you need I make some test please
> ask me. I will be happy to do.
>
> Please CC me in case of some discussion about this.
> Thanks a lot
>
> Andrea
>
>
>
> Jan 17 00:49:38 supernova kernel: [    0.302490] [drm] Initialized drm
> 1.1.0 20060810
> Jan 17 00:49:38 supernova kernel: [    0.302549] [drm] radeon
> defaulting to kernel modesetting.
> Jan 17 00:49:38 supernova kernel: [    0.302581] [drm] radeon kernel
> modesetting enabled.
> Jan 17 00:49:38 supernova kernel: [    0.302645] radeon 0000:01:00.0:
> PCI INT A -> GSI 16 (level, low) -> IRQ 16
> Jan 17 00:49:38 supernova kernel: [    0.305142] [drm] initializing
> kernel modesetting (RV730 0x1002:0x9498).
> Jan 17 00:49:38 supernova kernel: [    0.305239] [drm] register mmio
> base: 0xFE8E0000
> Jan 17 00:49:38 supernova kernel: [    0.305271] [drm] register mmio size: 65536
> Jan 17 00:49:38 supernova kernel: [    0.305422] ATOM BIOS: 4650
> Jan 17 00:49:38 supernova kernel: [    0.305476] radeon 0000:01:00.0:
> VRAM: 1024M 0x0000000000000000 - 0x000000003FFFFFFF (1024M used)
> Jan 17 00:49:38 supernova kernel: [    0.305515] radeon 0000:01:00.0:
> GTT: 512M 0x0000000040000000 - 0x000000005FFFFFFF
> Jan 17 00:49:38 supernova kernel: [    0.305556] mtrr: type mismatch
> for d0000000,10000000 old: write-back new: write-combining
> Jan 17 00:49:38 supernova kernel: [    0.305593] [drm] Detected VRAM
> RAM=1024M, BAR=256M
> Jan 17 00:49:38 supernova kernel: [    0.305624] [drm] RAM width 128bits DDR
> Jan 17 00:49:38 supernova kernel: [    0.305677] [TTM] Zone  kernel:
> Available graphics memory: 2026446 kiB.
> Jan 17 00:49:38 supernova kernel: [    0.305710] [TTM] Initializing
> pool allocator.
> Jan 17 00:49:38 supernova kernel: [    0.305757] [drm] radeon: 1024M
> of VRAM memory ready
> Jan 17 00:49:38 supernova kernel: [    0.305789] [drm] radeon: 512M of
> GTT memory ready.
> Jan 17 00:49:38 supernova kernel: [    0.305866] radeon 0000:01:00.0:
> radeon: using MSI.
> Jan 17 00:49:38 supernova kernel: [    0.305921] [drm] radeon: irq initialized.
> Jan 17 00:49:38 supernova kernel: [    0.305953] [drm] GART: num cpu
> pages 131072, num gpu pages 131072
> Jan 17 00:49:38 supernova kernel: [    0.307035] [drm] Loading RV730 Microcode
> Jan 17 00:49:38 supernova kernel: [    0.307068] [drm] requesting
> radeon/RV730_pfp.bin
> Jan 17 00:49:38 supernova kernel: [    0.307102] [drm] requesting
> radeon/RV730_me.bin
> Jan 17 00:49:38 supernova kernel: [    0.307133] [drm] requesting
> radeon/R700_rlc.bin
> Jan 17 00:49:38 supernova kernel: [    0.307164] [drm] Aff fw has been get
> Jan 17 00:49:38 supernova kernel: [    0.308936] radeon 0000:01:00.0: WB enabled
> Jan 17 00:49:38 supernova kernel: [    0.339215] [drm] r600 resume
> Jan 17 00:49:38 supernova kernel: [    0.355248] [drm] r600 cp start
> Jan 17 00:49:38 supernova kernel: [    0.355279] [drm] r600 cp start exiting
> Jan 17 00:49:38 supernova kernel: [    0.355309] [drm] r600 ring test
> Jan 17 00:49:38 supernova kernel: [    0.355342] [drm] ring test
> succeeded in 1 usecs
> Jan 17 00:49:38 supernova kernel: [    0.355460] [drm] radeon: ib pool ready.
> Jan 17 00:49:38 supernova kernel: [    0.355564] [drm] ib test
> succeeded in 0 usecs
> Jan 17 00:49:38 supernova kernel: [    0.355595] [drm] Enabling audio support
> Jan 17 00:49:38 supernova kernel: [    0.356072] [drm] Radeon Display Connectors
> Jan 17 00:49:38 supernova kernel: [    0.356103] [drm] Connector 0:
> Jan 17 00:49:38 supernova kernel: [    0.356133] [drm]   DVI-I
> Jan 17 00:49:38 supernova kernel: [    0.356162] [drm]   DDC: no ddc
> bus - possible BIOS bug - please report to xorg-driver-ati at lists.x.org
> Jan 17 00:49:38 supernova kernel: [    0.356199] [drm]   Encoders:
> Jan 17 00:49:38 supernova kernel: [    0.356229] [drm]     CRT2:
> INTERNAL_KLDSCP_DAC2
> Jan 17 00:49:38 supernova kernel: [    0.356259] [drm]     TV1:
> INTERNAL_KLDSCP_DAC2
> Jan 17 00:49:38 supernova kernel: [    0.356290] [drm]     DFP2:
> INTERNAL_UNIPHY1
> Jan 17 00:49:38 supernova kernel: [    0.356320] [drm] Connector 1:
> Jan 17 00:49:38 supernova kernel: [    0.356349] [drm]   HDMI-A
> Jan 17 00:49:38 supernova kernel: [    0.356378] [drm]   HPD3
> Jan 17 00:49:38 supernova kernel: [    0.356407] [drm]   DDC: 0x7e40
> 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c
> Jan 17 00:49:38 supernova kernel: [    0.356443] [drm]   Encoders:
> Jan 17 00:49:38 supernova kernel: [    0.356473] [drm]     DFP1: INTERNAL_UNIPHY
> Jan 17 00:49:38 supernova kernel: [    0.356503] [drm] Connector 2:
> Jan 17 00:49:38 supernova kernel: [    0.356532] [drm]   DVI-I
> Jan 17 00:49:38 supernova kernel: [    0.356561] [drm]   HPD1
> Jan 17 00:49:38 supernova kernel: [    0.356590] [drm]   DDC: 0x7e20
> 0x7e20 0x7e24 0x7e24 0x7e28 0x7e28 0x7e2c 0x7e2c
> Jan 17 00:49:38 supernova kernel: [    0.356626] [drm]   Encoders:
> Jan 17 00:49:38 supernova kernel: [    0.356655] [drm]     DFP1: INTERNAL_UNIPHY
> Jan 17 00:49:38 supernova kernel: [    0.356691] [drm]     CRT1:
> INTERNAL_KLDSCP_DAC1
> Jan 17 00:49:38 supernova kernel: [    0.360618] [drm] Internal
> thermal controller without fan control
> Jan 17 00:49:38 supernova kernel: [    0.361294] [drm] radeon: power
> management initialized
> Jan 17 00:49:38 supernova kernel: [    0.390317] No connectors
> reported connected with modes
> Jan 17 00:49:38 supernova kernel: [    0.390350] [drm] Cannot find any
> crtc or sizes - going 1024x768
> Jan 17 00:49:38 supernova kernel: [    0.391894] [drm] fb mappable at 0xD0142000
> Jan 17 00:49:38 supernova kernel: [    0.391925] [drm] vram apper at 0xD0000000
> Jan 17 00:49:38 supernova kernel: [    0.391955] [drm] size 3145728
> Jan 17 00:49:38 supernova kernel: [    0.391984] [drm] fb depth is 24
> Jan 17 00:49:38 supernova kernel: [    0.392014] [drm]    pitch is 4096
> Jan 17 00:49:38 supernova kernel: [    0.392162] fbcon: radeondrmfb
> (fb0) is primary device
> Jan 17 00:49:38 supernova kernel: [    0.395804] Console: switching to
> colour frame buffer device 128x48
> Jan 17 00:49:38 supernova kernel: [    0.397260] fb0: radeondrmfb
> frame buffer device
> Jan 17 00:49:38 supernova kernel: [    0.397278] drm: registered panic notifier
> Jan 17 00:49:38 supernova kernel: [    0.397298] [drm] Initialized
> radeon 2.7.0 20080528 for 0000:01:00.0 on minor 0
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