[PATCH] serial: 8250: don't lost port's default capabilities

[Greg Kroah-Hartman]

On Sat, Jul 06, 2024 at 04:29:28PM +0800, Jisheng Zhang wrote:
> Commit b0b8c84cf58d ("serial: of_serial: Handle auto-flow-control
> property") added support for fifo-size and hw-flow-control properties
> to avoid adding new types to 8250.c for UARTs that are compatible with
> the standard types but that have different size fifo or support 16750
> compatible auto flow control. We avoided many new 8250 port types with
> this nice feature, but there's a problem, if the code detects fifo-size
> or auto-flow-control property, up->capabilities will be set
> accordingly, then serial8250_set_defaults() will ignore the default
> port's capabilities:
> 
> |if (!up->capabilities)
> |	up->capabilities = uart_config[type].flags;
> 
> If the port's default capabilities contains other bits such as
> UART_CAP_SLEEP, UART_CAP_EFR and so on, they are lost.
> 
> Fixes: b0b8c84cf58d ("serial: of_serial: Handle auto-flow-control property")
> Signed-off-by: Jisheng Zhang <jszhang at kernel.org>
> ---
>  drivers/tty/serial/8250/8250_port.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 

Hi,

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