v2 dwc2 DMA alignment_buffer handling#6923
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pelwell merged 2 commits intoraspberrypi:rpi-6.12.yfrom Jun 24, 2025
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This incorrectly matches on urb->setup_packet instead of checking the pipe type, so recycled URBs were incorrectly matched. A more comprehensive fix is forthcoming. This reverts commit 2f27224. Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
The version of the dwc-otg core used in BCM2835 through BCM2712 only does whole-word writes, as well as needing the documented requirement for DMA buffers to start on a word boundary. Also, the alignment method used in the dwc2 driver doesn't handle the case where the URB has the NO_TRANSFER_DMA_MAP flag set, so reject buffers that have unaligned DMA start addresses. At least one whole page should be mapped, so the BCM283x whole-word-write bug should be benign in this case. Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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See: raspberrypi/linux#6920 kernel: v2 dwc2 DMA alignment_buffer handling See: raspberrypi/linux#6923 kernel: Add support for the Pi Vision 10.1" HMI See: raspberrypi/linux#6915
popcornmix
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See: raspberrypi/linux#6920 kernel: v2 dwc2 DMA alignment_buffer handling See: raspberrypi/linux#6923 kernel: Add support for the Pi Vision 10.1" HMI See: raspberrypi/linux#6915
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Candidate fix for #6911
Both UVC cameras and USB mass-storage are now functional on CM5.
All the Broadcom SoCs use the same SNPS core version (2.80a) so the hardware length bug is present in each.