Re: [PATCH] arm pl011 serial: support multi-irq request

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Mon, Jun 28, 2021 at 03:19:13PM +0800, bing fan wrote:
> From: Bing Fan <tombinfan@tencent.com>
> 
> In order to make pl011 work better, multiple interrupts are
> required, such as TXIM, RXIM, RTIM, error interrupt(FE/PE/BE/OE);
> at the same time, pl011 to GIC does not merge the interrupt
> lines(each serial-interrupt corresponding to different GIC hardware
> interrupt), so need to enable and request multiple gic interrupt
> numbers in the driver.
> 
> Signed-off-by: Bing Fan <hptsfb@gmail.com>
> ---
>  drivers/tty/serial/amba-pl011.c | 23 ++++++++++++++++++++++-
>  1 file changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
> index 78682c12156a..2b6f43c27dea 100644
> --- a/drivers/tty/serial/amba-pl011.c
> +++ b/drivers/tty/serial/amba-pl011.c
> @@ -1703,9 +1703,30 @@ static void pl011_write_lcr_h(struct
> uart_amba_port *uap, unsigned int lcr_h)
> 
>  static int pl011_allocate_irq(struct uart_amba_port *uap)
>  {
> +       int ret = -1;
> +       int i = 0;
> +       unsigned int virq = 0;
> +       struct amba_device *amba_dev = (struct amba_device *)uap->port.dev;
> +
> +       if (!amba_dev)
> +               return -1;
> +
>         pl011_write(uap->im, uap, REG_IMSC);
> 
> -       return request_irq(uap->port.irq, pl011_int, IRQF_SHARED,
> "uart-pl011", uap);
> +       for (i = 0; i < AMBA_NR_IRQS; i++) {
> +               virq = amba_dev->irq[i];
> +               if (virq == 0)          // request irq until virq is 0
> +                       break;
> +
> +               ret = request_irq(virq, pl011_int, IRQF_SHARED,
> "uart-pl011-*", uap);
> +               if (ret < 0) {
> +                       dev_info(uap->port.dev, "%s %d request %u
> interrupt failed\n",
> +                                       __func__, __LINE__, virq);
> +                       break;
> +               }
> +       }
> +
> +       return ret;
>  }
> 
>  /*
> -- 
> 2.17.1


Hi,

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