dual TT C-1501 on a single PCI riser

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Hi,

My name is Martin van Es and I just subscribed to the DVB mailinglist
because I'm currently facing a challenge that's beyond my knowledge so
I hope to find some cooperative minds in the list who could point me
in the right direction.

My problem is that I try to build a dual DVB-C tuner HTPC, based on an
Intel D945GSEJT mini-itx motherboard. This board is equipped with only
1 PCI slot, so a PCI riser is the only solution (no single board dual
DVB-C solutions exist today).

The case I've bought came with a riser but that didn't work so my
first attempt was to order this riser, which, they say is specifically
designed for the D945GSEJT:
http://www.tranquilpc-shop.co.uk/acatalog/PCI_Risers.html (top one,
it's based on a IT8209R PCI Arbiter).
When that didn't work I suspected there's more to this than correct
hardware and started looking for solutions, including mailing a
knowledgable PCI expert but even that didn't bring much relief. I must
add that I'm technically inclined, just lack a background in low-level
(PC) hardware programming.

So far my quest has revealed the following:
My 2 tunercards both get assigned a unique GSI on PCI interrupt A.
Both cards get detected correctly, but as soon as the second card
starts initialising the front-end it fails due to read/write timeouts
on the  saa7146 (i2c).
The interrupt counter assigned to the second card never shows any
activity (cat /proc/interrupts counter for irq 17 is 0).

Here are the (most) relevant pieces of dmesg output:
First the PCI initialisation. Mind the mentioning of both 0000:05:*
devices (the riser slots):

[    0.234259] ACPI: PCI Root Bridge [PCI0] (0000:00)
[    0.234500] pci 0000:00:02.0: reg 10 32bit mmio: [0xdfe80000-0xdfefffff]
[    0.234520] pci 0000:00:02.0: reg 14 io port: [0xf150-0xf157]
[    0.234537] pci 0000:00:02.0: reg 18 32bit mmio pref: [0xc0000000-0xcfffffff]
[    0.234555] pci 0000:00:02.0: reg 1c 32bit mmio: [0xdff00000-0xdff3ffff]
[    0.234641] pci 0000:00:02.1: reg 10 32bit mmio: [0xdfe00000-0xdfe7ffff]
[    0.234799] pci 0000:00:1b.0: reg 10 64bit mmio: [0xffe00000-0xffe03fff]
[    0.234875] pci 0000:00:1b.0: PME# supported from D0 D3hot D3cold
[    0.234889] pci 0000:00:1b.0: PME# disabled
[    0.235003] pci 0000:00:1c.0: PME# supported from D0 D3hot D3cold
[    0.235016] pci 0000:00:1c.0: PME# disabled
[    0.235131] pci 0000:00:1c.1: PME# supported from D0 D3hot D3cold
[    0.235144] pci 0000:00:1c.1: PME# disabled
[    0.235259] pci 0000:00:1c.2: PME# supported from D0 D3hot D3cold
[    0.235272] pci 0000:00:1c.2: PME# disabled
[    0.235387] pci 0000:00:1c.3: PME# supported from D0 D3hot D3cold
[    0.235400] pci 0000:00:1c.3: PME# disabled
[    0.235488] pci 0000:00:1d.0: reg 20 io port: [0xf0a0-0xf0bf]
[    0.235578] pci 0000:00:1d.1: reg 20 io port: [0xf080-0xf09f]
[    0.235669] pci 0000:00:1d.2: reg 20 io port: [0xf060-0xf07f]
[    0.235759] pci 0000:00:1d.3: reg 20 io port: [0xf040-0xf05f]
[    0.235856] pci 0000:00:1d.7: reg 10 32bit mmio: [0xdff41000-0xdff413ff]
[    0.235940] pci 0000:00:1d.7: PME# supported from D0 D3hot D3cold
[    0.235954] pci 0000:00:1d.7: PME# disabled
[    0.236202] pci 0000:00:1f.0: Force enabled HPET at 0xfed00000
[    0.236221] pci 0000:00:1f.0: quirk: region 0400-047f claimed by
ICH6 ACPI/GPIO/TCO
[    0.236236] pci 0000:00:1f.0: quirk: region 0500-053f claimed by ICH6 GPIO
[    0.236251] pci 0000:00:1f.0: ICH7 LPC Generic IO decode 1 PIO at
0a00 (mask 007f)
[    0.236265] pci 0000:00:1f.0: ICH7 LPC Generic IO decode 2 PIO at
1640 (mask 000f)
[    0.236352] pci 0000:00:1f.1: reg 10 io port: [0xf140-0xf147]
[    0.236371] pci 0000:00:1f.1: reg 14 io port: [0xf130-0xf133]
[    0.236390] pci 0000:00:1f.1: reg 18 io port: [0xf120-0xf127]
[    0.236408] pci 0000:00:1f.1: reg 1c io port: [0xf110-0xf113]
[    0.236426] pci 0000:00:1f.1: reg 20 io port: [0xf100-0xf10f]
[    0.236524] pci 0000:00:1f.2: reg 10 io port: [0xf0f0-0xf0f7]
[    0.236542] pci 0000:00:1f.2: reg 14 io port: [0xf0e0-0xf0e3]
[    0.236560] pci 0000:00:1f.2: reg 18 io port: [0xf0d0-0xf0d7]
[    0.236578] pci 0000:00:1f.2: reg 1c io port: [0xf0c0-0xf0c3]
[    0.236595] pci 0000:00:1f.2: reg 20 io port: [0xf020-0xf03f]
[    0.236614] pci 0000:00:1f.2: reg 24 32bit mmio: [0xdff40000-0xdff403ff]
[    0.236668] pci 0000:00:1f.2: PME# supported from D3hot
[    0.236681] pci 0000:00:1f.2: PME# disabled
[    0.236765] pci 0000:00:1f.3: reg 20 io port: [0x1180-0x119f]
[    0.236891] pci 0000:01:00.0: reg 10 io port: [0xe000-0xe0ff]
[    0.236929] pci 0000:01:00.0: reg 18 64bit mmio pref: [0xffd04000-0xffd04fff]
[    0.236959] pci 0000:01:00.0: reg 20 64bit mmio pref: [0xffd00000-0xffd03fff]
[    0.236980] pci 0000:01:00.0: reg 30 32bit mmio pref: [0xdfd00000-0xdfd1ffff]
[    0.237045] pci 0000:01:00.0: supports D1 D2
[    0.237055] pci 0000:01:00.0: PME# supported from D0 D1 D2 D3hot D3cold
[    0.237069] pci 0000:01:00.0: PME# disabled
[    0.237163] pci 0000:00:1c.0: bridge io port: [0xe000-0xefff]
[    0.237178] pci 0000:00:1c.0: bridge 32bit mmio: [0xdfd00000-0xdfdfffff]
[    0.237198] pci 0000:00:1c.0: bridge 64bit mmio pref: [0xffd00000-0xffdfffff]
[    0.237469] pci 0000:05:00.0: reg 10 32bit mmio: [0xdfc01000-0xdfc011ff]
[    0.237578] pci 0000:05:08.0: reg 10 32bit mmio: [0xdfc00000-0xdfc001ff]
[    0.237683] pci 0000:00:1e.0: transparent bridge
[    0.237700] pci 0000:00:1e.0: bridge 32bit mmio: [0xdfc00000-0xdfcfffff]
[    0.237750] pci_bus 0000:00: on NUMA node 0
[    0.237771] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT]
[    0.238344] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.P0P1._PRT]
[    0.238626] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.P0P4._PRT]
[    0.238822] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.P0P5._PRT]
[    0.280835] ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 7 10 *11 12 14 15)
[    0.281203] ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 7 *10 11 12 14 15)
[    0.281564] ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 6 *7 10 11 12 14 15)
[    0.281920] ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 10 *11 12 14 15)
[    0.282279] ACPI: PCI Interrupt Link [LNKE] (IRQs 3 4 5 6 *7 10 11 12 14 15)
[    0.282640] ACPI: PCI Interrupt Link [LNKF] (IRQs 3 4 5 6 7 10 11
12 14 15) *0, disabled.
[    0.283003] ACPI: PCI Interrupt Link [LNKG] (IRQs 3 4 5 6 7 10 11
12 14 15) *0, disabled.
[    0.283367] ACPI: PCI Interrupt Link [LNKH] (IRQs 3 4 5 6 7 *10 11 12 14 15)

And finally the initialisation of both budget_ci cards, of which only
the first one succeeds:
[    9.364122] saa7146: register extension 'budget_ci dvb'.
[    9.364253] budget_ci dvb 0000:05:00.0: PCI INT A -> GSI 20 (level,
low) -> IRQ 20
[    9.364334] IRQ 20/: IRQF_DISABLED is not guaranteed on shared IRQs
[    9.364417] saa7146: found saa7146 @ mem f8bd0000 (revision 1, irq
20) (0x13c2,0x101a).
[    9.364451] saa7146 (0): dma buffer size 192512
[    9.364463] DVB: registering new adapter (TT-Budget C-1501 PCI)
[    9.404001] adapter has MAC addr = 00:d0:5c:cd:53:57
[    9.405808] input: Budget-CI dvb ir receiver saa7146 (0) as
/devices/pci0000:00/0000:00:1e.0/0000:05:00.0/input/input7
[    9.558977] DVB: registering adapter 0 frontend 0 (Philips TDA10023 DVB-C)...
[    9.559245] budget_ci dvb 0000:05:08.0: PCI INT A -> GSI 17 (level,
low) -> IRQ 17
[    9.559339] IRQ 17/: IRQF_DISABLED is not guaranteed on shared IRQs
[    9.559404] saa7146: found saa7146 @ mem f8dfa000 (revision 1, irq
17) (0x13c2,0x101a).
[    9.559429] saa7146 (1): dma buffer size 192512
[    9.559438] DVB: registering new adapter (TT-Budget C-1501 PCI)
[    9.604093] saa7146 (1) saa7146_i2c_writeout [irq]: timed out
waiting for end of xfer
[    9.632093] saa7146 (1) saa7146_i2c_writeout [irq]: timed out
waiting for end of xfer
[    9.660155] saa7146 (1) saa7146_i2c_writeout [irq]: timed out
waiting for end of xfer
[    9.688088] saa7146 (1) saa7146_i2c_writeout [irq]: timed out
waiting for end of xfer
[    9.704110] Couldn't read from EEPROM: not there?
[    9.706068] input: Budget-CI dvb ir receiver saa7146 (1) as
/devices/pci0000:00/0000:00:1e.0/0000:05:08.0/input/input9
[    9.716109] saa7146 (1) saa7146_i2c_writeout [irq]: timed out
waiting for end of xfer
[    9.744091] saa7146 (1) saa7146_i2c_writeout [irq]: timed out
waiting for end of xfer
[    9.772100] saa7146 (1) saa7146_i2c_writeout [irq]: timed out
waiting for end of xfer
[    9.800093] saa7146 (1) saa7146_i2c_writeout [irq]: timed out
waiting for end of xfer
[    9.816139] DVB: TDA10023(-1): tda10023_writereg, writereg error
(reg == 0x00, val == 0x33, ret == -5)
[    9.828080] saa7146 (1) saa7146_i2c_writeout [irq]: timed out
waiting for end of xfer
[    9.856084] saa7146 (1) saa7146_i2c_writeout [irq]: timed out
waiting for end of xfer
[    9.884088] saa7146 (1) saa7146_i2c_writeout [irq]: timed out
waiting for end of xfer
[    9.912084] saa7146 (1) saa7146_i2c_writeout [irq]: timed out
waiting for end of xfer
[    9.928117] DVB: TDA10023(-1): tda10023_readreg: readreg error (reg
== 0x1a, ret == -5)
[    9.928778] budget-ci: A frontend driver was not found for device
[1131:7146] subsystem [13c2:101a]

Does anybody have a clue where to start looking? BIOS? (is flashed to
latest!). PCI initialisation routines (which)? Or is something simply
missing in the budget_ci code to catch this specific setup?

Regards,
Martin van Es
-- 
if but was of any use, it would be a logic operator
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