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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 9 Jul 2020
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      So this thing arrived. First impressions: - SuperSpeed only works in one Type C orientation (no mux) - Audio OK (2ch 48k 16b) - Definitely does 1080p30 uncompressed (YUV 4:2:2) - There may be sharpening - Claims to do 1080p60 but the image becomes softer, so I suspect cheating.pic.twitter.com/nbbe6uN9Vw

      6 replies 6 retweets 82 likes
      Show this thread
    2. Pillow‏ @CounterPillow 9 Jul 2020
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      Replying to @marcan42

      disassembly time? I wonder what chips it uses.

      1 reply 0 retweets 1 like
    3. Hector Martin‏ @marcan42 9 Jul 2020
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      Replying to @CounterPillow

      Hector Martin Retweeted Adam  ♿

      I think it's the same as this. The USB interface identifies itself as a Sunplus. My guess: (HDMI) -> ITE HDMI RX -> (parallel RGB/YUV) -> (tee to ITE HDMI TX) -> some kind of video processor -> (MIPI-CSI) -> Sunplus MIPI-CSI USB3 camera chip.https://twitter.com/voltagex/status/1271622684263084032 …

      Hector Martin added,

      Adam  ♿ @voltagex
      Replying to @Ascii211
      pic.twitter.com/W7GCZFXpsR
      1 reply 0 retweets 5 likes
    4. Hector Martin‏ @marcan42 9 Jul 2020
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      Replying to @marcan42 @CounterPillow

      Probably the same exact design as the PCIe ones, minux the xHCI USB3 controller. Middle chip would be VS9989, so second leg not MIPI-CSI but also parallel video. http://www.vxis.com/html/pdf/VS9989_bf_v1.3.pdf …pic.twitter.com/HjYT3CKy3Z

      3 replies 0 retweets 3 likes
    5. Daniel Kolesa‏ @octaforge 9 Jul 2020
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      Replying to @marcan42 @CounterPillow

      A PCIe card that's really a USB thing with its own xhci controller? Sounds kinda cursed I bet that thing does bad DMA all over the place and if i stuck it in my computer the IOMMU would prevent it from working

      2 replies 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 9 Jul 2020
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      Replying to @octaforge @CounterPillow

      It's just a standard xHCI controller, seems like VLI, probably VL800 or something. I don't expect it to be particularly bad. Plenty of computers use these chips.

      1 reply 0 retweets 0 likes
    7. Daniel Kolesa‏ @octaforge 9 Jul 2020
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      Replying to @marcan42 @CounterPillow

      VL800 is one of those that were broken IIRC, couldn't get it to show up, along with a bunch of asmedia trash

      1 reply 0 retweets 1 like
    8. Daniel Kolesa‏ @octaforge 9 Jul 2020
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      Replying to @octaforge @marcan42 @CounterPillow

      The thing is IOMMU on x86 systems is weaker than on my power9 systems, if enabled by default at all, so things appear to work but on p9 sketchy chips/firmware will just fail to work

      1 reply 0 retweets 0 likes
    9. Daniel Kolesa‏ @octaforge 9 Jul 2020
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      Replying to @octaforge @marcan42 @CounterPillow

      It's actually kind of a pain for me since it means it's impossible to get usb-c on these things, as the NEC stuff is USB 3.0 5Gbps at most, and all the newer stuff is some kind of broken

      1 reply 0 retweets 0 likes
    10. Hector Martin‏ @marcan42 9 Jul 2020
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      Replying to @octaforge @CounterPillow

      I've had to patch Linux to work around JMicron firewire crap reading out of bounds, but I've never seen xHCI fails like that... though I used to have a PC with a VLI chip but I'm not sure if I ever tested the IOMMU on it... this is on x86 though.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 9 Jul 2020
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      Replying to @marcan42 @octaforge @CounterPillow

      IOMMU should be the same on x86 though? Like I can't think what would make it "weaker" in the face of broken chips like this, other than sometimes several things winding up in the same IOMMU group (but not always).

      10:12 AM - 9 Jul 2020
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Daniel Kolesa‏ @octaforge 9 Jul 2020
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          Replying to @marcan42 @CounterPillow

          I hear some people had trouble on AMD as well, and on Intel stuff is disabled out of box, AFAIK. Also, each PCIe is isolated separately on P9

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 9 Jul 2020
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          Replying to @octaforge @CounterPillow

          Everything is separate on my lowly old Ivy Bridge laptop. Doesn't get much better than this, and this is basically crap Intel consumer mobile gear. You don't need a P9 to get isolation like this.pic.twitter.com/OH7LXgqEsg

          1 reply 0 retweets 0 likes
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