ID conflict between bdc_pci and "720p FaceTime HD Camera"
Hello,
The development of a driver for
02:00.0 Multimedia controller [0480]: Broadcom Corporation 720p FaceTime HD Camera [14e4:1570] has started. It is still in an early stage but it's progressing and it already streams.
https://github.com/patjak/bcwc_pcie
However, as you can see, this webcam shares the exact same ID as bdc_pci 0x1570 .
Could we use e.g. PCI_CLASS in bdc_pci to avoid grabbing the webcam incorrectly? The FaceTime HD Camera has PCI_CLASS 0x048000
I hope that bdc_pci has another PCI_CLASS.
Or maybe there is a better way to distinguish bdc_pci from FaceTime HD Camera. What do you think?
Regards,
Xavier
[+cc Ashwini, Felipe]
Quoted 12 lines · Xavier Gnata
Hello,
The development of a driver for
02:00.0 Multimedia controller [0480]: Broadcom Corporation 720p FaceTime HD Camera [14e4:1570]
has started. It is still in an early stage but it's progressing and it already streams.
https://github.com/patjak/bcwc_pcieHowever, as you can see, this webcam shares the exact same ID as
bdc_pci0x1570.
Quoted 6 lines
Could we use e.g.
PCI_CLASSinbdc_pcito avoid grabbing the webcam incorrectly?
The FaceTime HD Camera hasPCI_CLASS0x048000
I hope thatbdc_pcihas anotherPCI_CLASS.
Or maybe there is a better way to distinguishbdc_pcifrom FaceTime HD Camera. What do you think?
This is what the PCI Vendor/Device IDs are for. It's a shame that Broadcom apparently screwed up and used the same IDs in two different devices.
At least, I *assume* they're different. I can't really tell what the bdc_pci driver does, so it's conceivable that it's using the same device in a different way than you are.
If they really are different devices, using the class code sounds like a reasonable way to differentiate them.
Bjorn
Quoted 26 lines · Bjorn Helgaas
[+cc Ashwini, Felipe]
Quoted 12 lines · Xavier Gnata
Hello,
The development of a driver for
02:00.0 Multimedia controller [0480]: Broadcom Corporation 720p FaceTime HD Camera [14e4:1570]
has started. It is still in an early stage but it's progressing and it already streams.
https://github.com/patjak/bcwc_pcieHowever, as you can see, this webcam shares the exact same ID as
bdc_pci0x1570.Quoted 6 lines
Could we use e.g.
PCI_CLASSinbdc_pcito avoid grabbing the webcam incorrectly?
The FaceTime HD Camera hasPCI_CLASS0x048000
I hope thatbdc_pcihas anotherPCI_CLASS.
Or maybe there is a better way to distinguishbdc_pcifrom FaceTime HD Camera. What do you think?This is what the PCI Vendor/Device IDs are for. It's a shame that Broadcom apparently screwed up and used the same IDs in two different devices.
Quoted 9 lines
At least, I *assume* they're different. I can't really tell what the
bdc_pcidriver does, so it's conceivable that it's using the same device in a different way than you are.If they really are different devices, using the class code sounds like a reasonable way to differentiate them.
Bjorn
bdc is "Broadcom's USB3.0 device controller IP" in the SOC world which is connected through PCIe on FPGA-PCIe based platform. Nothing to do with the Facetime HD webcam of a macbook air.
Broadcom screwed up.
The issue is that I don't have access to such a BDC. I also don't find it in
http://pcidatabase.com/vendor_details.php?id=767
which lists 0x1570 as being the webcam.
Where can we find the PCI class of this "Broadcom's USB3.0 device controller IP" ? Ashwini?
Xavier