Christian P. Schmidt wrote:
Hi all,
I'm toying with the alsa-driver for the Creative Labs X-Fi. I'm working on the PCI Express version of this card, though, which is the same as the PCI version plus a PCIe to PCI bridge but has a different ID:
+-1c.2-[0000:03-04]----00.0-[0000:04]----00.0 1102:000903:00.0 PCI bridge: Creative Labs Device 7006 04:00.0 Audio device: Creative Labs [SB X-Fi Xtreme Audio] CA0110-IBG
Now, after adding the ID, the driver fails:
[46833.487579] CA0106 0000:04:00.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18 [46833.487586] CA0106 0000:04:00.0: PCI INT A disabled [46833.487588] cannot allocate the port [46833.487594] CA0106: probe of 0000:04:00.0 failed with error -16
The actual error is occurring in
chip->port = pci_resource_start(pci, 0); chip->res_port = request_region(chip->port, pci_resource_len(pci,0), "snd_ca0106"); if (!chip->res_port) { snd_ca0106_free(chip); printk(KERN_ERR "cannot allocate the port\n"); return -EBUSY; }
This from /proc/iomem:
f9f00000-f9ffffff : PCI Bus 0000:03 f9f00000-f9ffffff : PCI Bus 0000:04 f9ffc000-f9ffffff : 0000:04:00.0
Some additional debug output tells me that the code is actually trying to allocate 16k starting from f9ffc000. What could be potential reasons for the failure? Do I have to do something with the bridge before I can try to request the region?
request_region is requesting IO ports. The PCI BAR on the card is MMIO memory, not IO ports, so request_mem_region has to be used. It's possible that this driver isn't set up to handle MMIO space.