On Wed, Jan 26, 2022 at 02:11:24PM +0000, Phil Elwell wrote: > The mini-UART on BCM283x is doubly crippled - it has 8-byte FIFOs and > the THRE bit indicates that the TX FIFO is not-full rather than empty. > > The optimisation to enable the use of the FIFO assumes that it is safe > to write fifosize bytes whenever THRE is set, but the BCM283x quirk > (indicated by the presence of UART_CAP_MINI) makes it necessary to > check the FIFO state after each byte. > > See: https://github.com/raspberrypi/linux/issues/4849 > > Fixes: 5021d709b31b ("tty: serial: Use fifo in 8250 console driver") I have just reverted this commit, it's broken for many platforms now, not just yours. So there shouldn't be a need for this change now, right? thanks, greg k-h
