title: SCIF; check DMA problems with SysRq, BREAK and parity errors
team: IO
key: 3cdb3c8c-03d9-11eb-91e0-b7234f6a00bc
status: Done
assignee: Ulrich

upstream:
 - torvalds: 87b8061bad9bd4b549b2daf36ffbaa57be2789a2 # serial: sh-sci: fix break handling for sysrq

comments:
 - "check IO IRC log from 2020-10-01 for details"
 - "it seems we need to enable interrupts during DMA again, discard the receive interrupts and deal with break and parity"
 - "Ulrich will try if it works and how it will affect DMA performance"
 - "Ulrich said it has nothing to do with DMA, break support is broken per se"
 - "v1: https://patchwork.kernel.org/project/linux-renesas-soc/patch/20210816162201.28801-1-uli+renesas@fpond.eu/"
 - "merged"