tree d8f1a6044d737aa998d3f7880343336c0fc4a91b
parent 0247876c45f9f7ac7af9d9500b1facc9f10d7fa0
author Pali Rohár <pali@kernel.org> 1613472984 +0100
committer Pali Rohár <pali@kernel.org> 1613472984 +0100

marvell: uart: a3720: Increase TX FIFO EMPTY timeout from 2ms to 3ms

TX FIFO has space for 32 characters. With default UART baudrate 115200 it
takes more than 2ms to transmit all 32 characters, so wait at least 3ms
before flushing TX FIFO.

If WTMI firmware transmitted something via UART before TF-A was booted,
some characters may still wait in TX FIFO when TF-A is initializing UART
driver. So wait at least 3ms to ensure that HW has enough time to transmit
all characters waiting in TX FIFO.

This fixes an issue where sometimes characters transmitted on UART by our
custom WTMI image are lost.

Signed-off-by: Pali Rohár <pali@kernel.org>
Change-Id: I8ea4ea58e4ba3e0c0d7f47e679171b9b94442f19