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 | 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..b63164e89903 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)
+ 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
