diff options
| author | Kinsey Moore <kinsey.moore@oarcorp.com> | 2021-06-23 11:57:18 -0500 |
|---|---|---|
| committer | Joel Sherrill <joel@rtems.org> | 2021-06-29 11:42:06 -0500 |
| commit | 26d61c867077e0b529f7ab301188101e7352022d (patch) | |
| tree | 0551cb76c8b5f4713d4fb9624e791252405a1c6e /bsps/shared/dev/serial/zynq-uart.c | |
| parent | spec/aarch64: fix abi flags for xilinx_versal_ilp32_vck190 (diff) | |
| download | rtems-26d61c867077e0b529f7ab301188101e7352022d.tar.bz2 | |
bsps/zynq-uart: Make post baud change kick global
The existing fix for the ZynqMP UART hardware bug only caught the vast
majority of instances where it could occur. To fully fix the data
corruption, this fix must be applied after every baud rate change. This
makes the logic reset and kick apply in any locations where the baud
rate could be changed.
Diffstat (limited to 'bsps/shared/dev/serial/zynq-uart.c')
| -rw-r--r-- | bsps/shared/dev/serial/zynq-uart.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/bsps/shared/dev/serial/zynq-uart.c b/bsps/shared/dev/serial/zynq-uart.c index cd0d0e7584..8503e31d49 100644 --- a/bsps/shared/dev/serial/zynq-uart.c +++ b/bsps/shared/dev/serial/zynq-uart.c @@ -214,9 +214,17 @@ static bool zynq_uart_set_attributes( if (baud > 0) { regs->baud_rate_gen = ZYNQ_UART_BAUD_RATE_GEN_CD(brgr); regs->baud_rate_div = ZYNQ_UART_BAUD_RATE_DIV_BDIV(bauddiv); + regs->control |= ZYNQ_UART_CONTROL_RXRES + | ZYNQ_UART_CONTROL_TXRES; } regs->control |= ZYNQ_UART_CONTROL_RXEN | ZYNQ_UART_CONTROL_TXEN; + /* + * Some ZynqMP UARTs have a hardware bug that causes TX/RX logic restarts to + * require a kick after baud rate registers are initialized. + */ + zynq_uart_write_polled(context, 0); + return true; } |