dwc_otg: fiq_fsm: Make high-speed isochronous strided transfers work properly #1094
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| @@ -1692,9 +1695,11 @@ int fiq_fsm_queue_isoc_transaction(dwc_otg_hcd_t *hcd, dwc_otg_qh_t *qh) | |||
| DWC_WRITE_REG32(&hc_regs->hcintmsk, st->hcintmsk_copy.d32); | |||
| if (hfnum.b.frrem < PERIODIC_FRREM_BACKOFF) { | |||
| /* Prevent queueing near EOF1. Bad things happen if a periodic | |||
| * split transaction is queued very close to EOF. | |||
| * split transaction is queued very close to EOF. SOF interrupt handler | |||
| * will wake this channel at the next interrupt. * | |||
…properly Certain low-bandwidth high-speed USB devices (specialist audio devices, compressed-frame webcams) have packet intervals > 1 microframe. Stride these transfers in the FIQ by using the start-of-frame interrupt to restart the channel at the right time.
popcornmix
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dwc_otg: fiq_fsm: Make high-speed isochronous strided transfers work properly
popcornmix
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kernel: dwc_otg: fiq_fsm: Make high-speed isochronous strided transfers work properly See: raspberrypi/linux#1094
popcornmix
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kernel: dwc_otg: fiq_fsm: Make high-speed isochronous strided transfers work properly See: raspberrypi/linux#1094
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kernel: dwc_otg: fiq_fsm: Make high-speed isochronous strided transfers work properly See: raspberrypi/linux#1094
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Fixes playback on my Schitt Modi 2 audio box.
Should fix the root cause identified in #888.