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NAKINTRPT interrupt is starting point for isoc-in transfer, synchronization done with first in token received from host, core asserts this interrupt when responds with 0 length data to in token, received from host. The first IN token is asynchronous for device - device does not know when first one token will arrive from host. On first token arrival HW generates 2 interrupts: 'in token received while FIFO empty' and 'NAK'. NAK interrupt for ISOC in means that token has arrived and ZLP was sent in response to that as there was no data in FIFO. SW is basing on this interrupt to obtain frame in which token has come and then based on the interval calculates next frame for transfer. OUTTKNEPDIS interrupt is starting point for isoc-out transfer, synchronization done with first out token received from host while corresponding ep is disabled. For OUTs the reason is same - device does not know initial frame in which out token will come. For this HW generates OUTTKNEPDIS - out token is received while EP is disabled. Upon getting this interrupt SW starts calculation for next transfer frame. Tested-by: John Keeping <john@metanate.com> Signed-off-by: Vardan Mikayelyan <mvardan@synopsys.com> Signed-off-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com> |
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| .. | ||
| core_intr.c | ||
| core.c | ||
| core.h | ||
| debug.h | ||
| debugfs.c | ||
| gadget.c | ||
| hcd_ddma.c | ||
| hcd_intr.c | ||
| hcd_queue.c | ||
| hcd.c | ||
| hcd.h | ||
| hw.h | ||
| Kconfig | ||
| Makefile | ||
| pci.c | ||
| platform.c | ||