On Fri, Aug 13, 2021 at 11:31:30AM +0800, Bing Fan wrote:
> From: Bing Fan <tombinfan@xxxxxxxxxxx>
>
> 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 <tombinfan@xxxxxxxxxxx>
> ---
> drivers/tty/serial/amba-pl011.c | 39 +++++++++++++++++++++++++++++++--
> 1 file changed, 37 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
> index e14f3378b8a0..eaac3431459c 100644
> --- a/drivers/tty/serial/amba-pl011.c
> +++ b/drivers/tty/serial/amba-pl011.c
> @@ -1701,6 +1701,41 @@ static void pl011_write_lcr_h(struct uart_amba_port *uap, unsigned int lcr_h)
> }
> }
>
> +static void pl011_release_multi_irqs(struct uart_amba_port *uap, unsigned int max_cnt)
> +{
> + struct amba_device *amba_dev = container_of(uap->port.dev, struct amba_device, dev);
> + int i;
> +
> + for (i = 0; i < max_cnt; i++)
> + if (amba_dev->irq[i])
> + free_irq(amba_dev->irq[i], uap);
> +}
> +
> +static int pl011_allocate_multi_irqs(struct uart_amba_port *uap)
> +{
> + int ret = 0;
> + int i;
> + unsigned int virq;
> + struct amba_device *amba_dev = container_of(uap->port.dev, struct amba_device, dev);
> +
> + pl011_write(uap->im, uap, REG_IMSC);
> +
> + for (i = 0; i < AMBA_NR_IRQS; i++) {
> + virq = amba_dev->irq[i];
> + if (virq == 0)
> + break;
> +
> + ret = request_irq(virq, pl011_int, IRQF_SHARED, dev_name(&amba_dev->dev), uap);
> + if (ret) {
> + dev_err(uap->port.dev, "request %u interrupt failed\n", virq);
> + pl011_release_multi_irqs(uap, i - 1);
> + break;
> + }
> + }
> +
> + return ret;
> +}
This function looks identical to pl011_allocate_irq(), so what is the
difference here? Why is this still needed at all? What does it do that
is different from pl011_allocate_irq()?
confused,
greg k-h
