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usb: dwc2: masquerade split-interrupt transfers - #6936
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P33M
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July 8, 2025 09:21
Masquerading Interrupt split transfers as Control puts the transfer into the non-periodic handler in the hub. This stops the hub dropping complete-split data in the microframe after a CSPLIT should have arrived, improving resilience to host IRQ latency. Devices are none the wiser - the handshake tokens are the same. Originally devised by Hans Petter Selasky @ FreeBSD. (v2: dwc2 needs an un-masquerade prior to channel interrupt handling) Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
Control Setup phase transfers needs an 8 byte maxpacket override, or drivers doing a GET with a small buffer as a split transaction would cause broken transfers. Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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popcornmix
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Jul 11, 2025
kernel: Add support for phy interrupts on BCM54213PE See: raspberrypi/linux#6942 kernel: usb: dwc2: masquerade split-interrupt transfers See: raspberrypi/linux#6936
popcornmix
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Jul 11, 2025
kernel: Add support for phy interrupts on BCM54213PE See: raspberrypi/linux#6942 kernel: usb: dwc2: masquerade split-interrupt transfers See: raspberrypi/linux#6936
sairon
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Aug 14, 2025
Raspberry Pi Linux update to 6.12.34 broken some USB devices, mostly USB-Serial converters connected to Yellow, but there are reports of some other peripherals connected to RPi boards too. This is a known RPi upstream issue [1] fixed by a PR [2] that's not been merged to RPi stable kernel yet. Applying patches from this PR fixes the issues. Fixes #4228, refs #4229 [1] raspberrypi/linux#6941 [2] raspberrypi/linux#6936
sairon
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Aug 14, 2025
Raspberry Pi Linux update to 6.12.34 broken some USB devices, mostly USB-Serial converters connected to Yellow, but there are reports of some other peripherals connected to RPi boards too. This is a known RPi upstream issue [1] fixed by a PR [2] that's not been merged to RPi stable kernel yet. Applying patches from this PR fixes the issues. Fixes #4228, refs #4229 [1] raspberrypi/linux#6941 [2] raspberrypi/linux#6936
mahabubul470
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Dec 23, 2025
Raspberry Pi Linux update to 6.12.34 broken some USB devices, mostly USB-Serial converters connected to Yellow, but there are reports of some other peripherals connected to RPi boards too. This is a known RPi upstream issue [1] fixed by a PR [2] that's not been merged to RPi stable kernel yet. Applying patches from this PR fixes the issues. Fixes home-assistant#4228, refs home-assistant#4229 [1] raspberrypi/linux#6941 [2] raspberrypi/linux#6936
pavliha
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Mar 15, 2026
Upgrade kernel packages (>= 6.12.35) during image build to include the DWC2 split-interrupt masquerade fix (raspberrypi/linux#6936). This is the proper kernel-level fix for high-speed USB issues with Cube Orange flight controllers on Pi Zero 2W. - Revert cmdline.txt autosuspend workaround (kernel fix is sufficient) - Keep udev rules as defense-in-depth for flight controller USB stability
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Related: #7282 |
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Second attempt at porting the dwc_otg hack to avoid dropped split transactions.
Transactions now "look OK" on the bus analyser but this needs more soak testing with different hub implementations.