[linux-dvb] [PATCH] Shrink saa7134 mmio mapped size

Matthias Schwarzott zzam at gentoo.org
Wed Jul 2 17:12:53 CEST 2008

On Mittwoch, 2. Juli 2008, Andy Burns wrote:
> The saa7134 driver attempts to map 4K starting from the base address of
> its mmio area, although lspci shows the size of the area is only 1K. The
> excessive mapping goes un-noticed on bare-metal, but is detected and
> denied when the card is used with pci passthrough to a xen domU. If
> shared IRQ is used the "pollirq" kernel option may be required in dom0.

I have no real insight into the saa7134 core, but at least my card does have a 
memory region of 2K.

lspci -vvnn:
00:0b.0 Multimedia controller [0480]: Philips Semiconductors SAA7133/SAA7135 
Video Broadcast Decoder [1131:7133] (rev d1)
        Subsystem: Avermedia Technologies Inc Device [1461:a7a1]
        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: 32 (63750ns min, 63750ns max)
        Interrupt: pin A routed to IRQ 19
        Region 0: Memory at dfffb800 (32-bit, non-prefetchable) [size=2K]
        Capabilities: [40] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA 
                Status: D0 PME-Enable- DSel=0 DScale=3 PME-
        Kernel driver in use: saa7134
        Kernel modules: saa7134


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