ChanServ changed the topic of #asahi-re to: Asahi Linux: porting Linux to Apple Silicon macs | Hardware / boot process / firmware interface reverse engineering | WARNING: this channel (only) may contain binary reverse engineering discussion | RE policy: https://alx.sh/re (MANDATORY READ) | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-re
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<alyssa> looks like we can get to i2c via dcp over one of the other endpoints (dpdev, mdcp29xx, ..)
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<sven> hrm, so we may need that rtkit node after all?
<alyssa> sven: what makes you say that?
<alyssa> if everything we need is accessible over dcp, we don't /need/ i2c from the ap
<sven> oh
<alyssa> it's unclear to me if the other endpoints expose raw "send i2c, recv i2c" calls
<sven> so this is not a separate i2c bus we need to expose to other drivers
<alyssa> no, I don't think so
<alyssa> i mean
<alyssa> usually there's an i2c bus for the display and that does get routed into userspace but AFAIK there's no good reason to fake it in our case
<sven> ok
<alyssa> well, "fake" .... there still an i2c bus that the DCP is using internally to get at display properties
<alyssa> just a question of whether the AP can bypass the DCP (directly or indirectly), and whether that's ever useful
<sven> uhh... wtf.. the interrupt mask on the USB PD chips seems to be 8 bytes but the interrupt event register 11 bytes of which macos only reads 9?!
<alyssa> uh
<roxfan> 72 bits ought to be enough for everyone
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<sven> urgh.. and it looks like the interrupt bits are different from those defined in the TI manual i think :/
<roxfan> it would be too boring otherwise
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