Workaround new USB using SPMI instead of I2C #365
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M3+ have a new USB power controller and it works over SPMI. However, the USB ports work (at least within m1n1) if we ignore this and just init the phys directly. This detects the case where we are not on an I2C based USB machine, and initializes the phys directly. Eventually we should support SPMI properly. Signed-off-By: Daniel Berlin <[email protected]>
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Ugh. Well that's going to be fun. |
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It's actually not too bad - turning on HPM debugging in macos shows
the actual commands that get issued are identical (IE the fourcc and
all), it's just the transport that's different.
So we just have to figure out the command execution protocol and the
rest of the code from the existing i2c driver should work.
I've been working it out in a python experiment, but it's not quite there yet.
…On Sun, Dec 3, 2023 at 3:36 AM Hector Martin ***@***.***> wrote:
Ugh. Well that's going to be fun.
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This patch is a workaround for the lack of SPMI support in usb.c
Newer machines use SPMI and a different type C power controller.
This patch still lets us make the USB ports work by skipping power-on and just enabling the phys