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usb: Full charging current from a Mac on every board - #108
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This was referenced Nov 8, 2026
brkosebay
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The Lightning charger took the current a USB host grants as reported; it now caps it at the board's maximum. The gadget no longer draws an Apple host's extra current while the bus is suspended. Both apply to every board with this charger and gadget. From orchard PR OrchardLinux#108 (commit 0674e1d), the two kernel patches.
macOS grants 2400 mA only to USB product IDs on its own list. Installed Orchard systems now present Apple's vendor ID with product ID 0x1014 from that list, as an interface-association composite so macOS binds its generic composite driver (which delivers the grant) beside the CDC network and serial drivers. A Mac then charges the tablet at full speed; the charger caps the grant at the board maximum. The host CLI recognises 0x1014 as an installed system only with an Orchard serial, and the Linux access rules include it. RAM payloads keep their ID. From orchard PR OrchardLinux#108 (commit 0674e1d): the identity there was opt-in and J71t-only; it is now the default for every board.
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Landing this with your two kernel patches as your commit (grant capped at the board maximum, no extra current while suspended; the budget log is a debug message). The Mac current identity (0x1014, IAD class) is now the default for every installed system rather than a J71t opt-in, and hosts recognise 0x1014 as an installed system only with an Orchard serial. Your previous head is kept as tag |
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How macOS decides to grant 2400 mA (its power table, the 40/40 vendor request, why the device class must be the IAD composite), what the tablet does with a grant, the device acceptance check, and the NCM stall findings from the J71t bring-up. From orchard PR #108 (commit 0674e1d, docs/bring-up/charging/ j71t-mac-current.md), updated to what landed: the identity is the default for every installed system, macOS approves it once thanks to the stable USB serial, and the opt-in file and host test sections are gone.
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Part 6 of 23 of the iPad 5 (J71t) series in this repository; merge after #106.
Problem
A Mac grants an iPad more than the standard USB current, but the charger took the gadget's reported budget unchecked and the composite gadget could draw the extra current while the bus was suspended.
Change
Cap and log the USB host budget in the TriStar charger, draw no extra Apple current while suspended, and let the initramfs and
orchardUSB helpers opt J71t into the Mac current profile. Documented in docs/bring-up/charging/j71t-mac-current.md, with tests.Testing
Dependencies
Depends on #106.
This branch is stacked on the PRs it depends on and carries their commits; the change of this PR is its last commit, "j71t: Guarded Mac current profile".
This update keeps the branch's earlier history: it merges the current base into the branch and adds the reworked change as a new commit on top.
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