On Thu, Dec 13, 2018 at 02:24:03PM +0800, Ryder Lee wrote:
> The MediaTek BTIF controller doesn't need to set termios so add
> a new capability 'UART_CAP_NMOD' for the unsupported case.
>
>
> Signed-off-by: Sean Wang <sean.w...@mediatek.com>
> Signed-off-by: Ryder Lee <ryder....@mediatek.com>
> ---
> drivers/tty/serial/8250/8250.h | 1 +
> drivers/tty/serial/8250/8250_port.c | 7 ++++++-
> 2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h
> index ebfb0bd..2b9ba39 100644
> --- a/drivers/tty/serial/8250/8250.h
> +++ b/drivers/tty/serial/8250/8250.h
> @@ -80,6 +80,7 @@ struct serial8250_config {
> #define UART_CAP_MINI (1 << 17) /* Mini UART on BCM283X family
> lacks:
> * STOP PARITY EPAR SPAR WLEN5 WLEN6
> */
> +#define UART_CAP_NMOD (1 << 18) /* UART doesn't do termios */
>
> #define UART_BUG_QUOT (1 << 0) /* UART has buggy quot LSB */
> #define UART_BUG_TXEN (1 << 1) /* UART has buggy TX IIR status
> */
> diff --git a/drivers/tty/serial/8250/8250_port.c
> b/drivers/tty/serial/8250/8250_port.c
> index c39482b..e4a69a0 100644
> --- a/drivers/tty/serial/8250/8250_port.c
> +++ b/drivers/tty/serial/8250/8250_port.c
> @@ -297,7 +297,7 @@
> .tx_loadsz = 16,
> .fcr = UART_FCR_ENABLE_FIFO |
> UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
> - .flags = UART_CAP_FIFO,
> + .flags = UART_CAP_FIFO | UART_CAP_NMOD,
> },
> [PORT_NPCM] = {
> .name = "Nuvoton 16550",
> @@ -2663,6 +2663,11 @@ static unsigned int serial8250_get_baud_rate(struct
> uart_port *port,
> unsigned long flags;
> unsigned int baud, quot, frac = 0;
>
> + if (up->capabilities & UART_CAP_NMOD) {
> + termios->c_cflag = 0;
So your port is limited to 5-bits and is unable to receive characters?
That's what a zero cflag means, and that's what you'll be telling
userspace here.
--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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