qemu/include/hw/char
Martin Kaiser bd96e10071 imx_serial: set wake bit when we receive a data byte
The Linux kernel added a flood check for RX data recently in commit
496a4471b7c3 ("serial: imx: work-around for hardware RX flood"). This
check uses the wake bit in the UART status register 2. The wake bit
indicates that the receiver detected a start bit on the RX line. If the
kernel sees a number of RX interrupts without the wake bit being set, it
treats this as spurious data and resets the UART port. imx_serial does
never set the wake bit and triggers the kernel's flood check.

This patch adds support for the wake bit. wake is set when we receive a
new character (it's not set for break events). It seems that wake is
cleared by the kernel driver, the hardware does not have to clear it
automatically after data was read.

The wake bit can be configured as an interrupt source. Support this
mechanism as well.

Co-developed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2023-06-19 11:35:58 +01:00
..
avr_usart.h hw: Remove superfluous includes of hw/hw.h 2021-05-02 17:24:50 +02:00
bcm2835_aux.h Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
cadence_uart.h Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
cmsdk-apb-uart.h hw/char/cmsdk-apb-uart: Open-code cmsdk_apb_uart_create() 2023-02-27 13:27:05 +00:00
digic-uart.h Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
escc.h Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
goldfish_tty.h include: Include headers where needed 2023-01-08 01:54:22 -05:00
ibex_uart.h include/hw: Do not include "hw/registerfields.h" in headers that don't need it 2023-02-14 09:02:42 +01:00
imx_serial.h imx_serial: set wake bit when we receive a data byte 2023-06-19 11:35:58 +01:00
mchp_pfsoc_mmuart.h hw/char/mchp_pfsoc_mmuart: QOM'ify PolarFire MMUART 2021-10-07 08:41:33 +10:00
nrf51_uart.h Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
parallel-isa.h hw/char/parallel-isa: Export struct ISAParallelState 2023-06-13 11:28:58 +02:00
parallel.h hw/char/parallel-isa: Export struct ISAParallelState 2023-06-13 11:28:58 +02:00
pl011.h hw/char/pl011: Open-code pl011_luminary_create() 2023-02-27 13:27:05 +00:00
renesas_sci.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
riscv_htif.h hw/riscv: Add signature dump function for spike to run ACT tests 2023-05-05 10:49:50 +10:00
serial.h hw/char/serial: Make 'wakeup' property boolean 2020-09-30 19:09:20 +02:00
shakti_uart.h hw/char: Add Shakti UART emulation 2021-05-11 20:02:05 +10:00
sifive_uart.h hw/char: QOMify sifive_uart 2021-06-24 05:00:12 -07:00
stm32f2xx_usart.h Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
xilinx_uartlite.h hw/char/xilinx_uartlite: Open-code xilinx_uartlite_create() 2023-02-27 13:27:05 +00:00