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lib: utils/serial: Clear LSR status and check RBR status

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On some platforms, read RBR when it is empty may result in an error.

Signed-off-by: Yi Pei <neopimail@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/CAFPVDjQZ1gpf8-u--RBbAL1Y0FfDN2vZ3g=wBw+Bp-8ppuz3HA@mail.gmail.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Yi Pei
2025-07-20 20:37:18 +05:30
committed by Anup Patel
parent a32a910691
commit b8f370aa37
1 changed files with 3 additions and 4 deletions
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7
lib/utils/serial/uart8250.c
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@@ -133,10 +133,9 @@ int uart8250_init(unsigned long base, u32 in_freq, u32 baudrate, u32 reg_shift,
set_reg(UART_FCR_OFFSET, 0x01);
/* No modem control DTR RTS */
set_reg(UART_MCR_OFFSET, 0x00);
/* Clear line status */
get_reg(UART_LSR_OFFSET);
/* Read receive buffer */
get_reg(UART_RBR_OFFSET);
/* Clear line status and read receive buffer */
if (get_reg(UART_LSR_OFFSET) & UART_LSR_DR)
get_reg(UART_RBR_OFFSET);
/* Set scratchpad */
set_reg(UART_SCR_OFFSET, 0x00);