On Wed, Nov 13, 2024 at 10:40:23AM +0530, Kartik wrote:
> Function pl011_throttle_rx() calls pl011_stop_rx() to disable RX, which
> also disables the RX DMA by clearing the RXDMAE bit of the DMACR
> register. However, to properly unthrottle RX when DMA is used, the
> function pl011_unthrottle_rx() is expected to set the RXDMAE bit of
> the DMACR register, which it currently lacks. This causes RX to stall
> after the throttle API is called.
>
> Set RXDMAE bit in the DMACR register while unthrottling RX if RX DMA is
> used.
>
> Fixes: 211565b10099 ("serial: pl011: UPSTAT_AUTORTS requires .throttle/unthrottle")
> Signed-off-by: Kartik <kkartik@xxxxxxxxxx>
> ---
> drivers/tty/serial/amba-pl011.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
> index 4c4b0d470c65..f40714685166 100644
> --- a/drivers/tty/serial/amba-pl011.c
> +++ b/drivers/tty/serial/amba-pl011.c
> @@ -1819,6 +1819,11 @@ static void pl011_unthrottle_rx(struct uart_port *port)
>
> pl011_write(uap->im, uap, REG_IMSC);
>
> + if (uap->using_rx_dma) {
> + uap->dmacr |= UART011_RXDMAE;
> + pl011_write(uap->dmacr, uap, REG_DMACR);
> + }
> +
> uart_port_unlock_irqrestore(&uap->port, flags);
> }
>
> --
> 2.47.0
>
>
Hi,
This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him
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