Even though the UART IP on MTK platforms is 16550A compatible, some registers are not at a "standard" offset. In order to allow full functionality of the flow control features and to make Linux able to fully and properly reconfigure the UART IP, eventually allowing communication at high speed after a full IP reset, some register offset fixes have been done. While at it, even though this bit is always set, also paranoidly make sure that the "new register map" feature is enabled, as that's done with just one writel() at probe time, introducing no overhead. This has been tested on multiple Chromebooks featuring different SoCs, and a MT6795 Xperia M5 smartphone. AngeloGioacchino Del Regno (3): serial: 8250_mtk: Fix UART_EFR register address serial: 8250_mtk: Make sure to select the right FEATURE_SEL serial: 8250_mtk: Fix register address for XON/XOFF character drivers/tty/serial/8250/8250_mtk.c | 29 ++++++++++++++++++++--------- 1 file changed, 20 insertions(+), 9 deletions(-) -- 2.35.1
