When use gic_irq_set_clr_enable() to disable an interrupt, it will
disable all interrupt since it first read from Interrupt Clear-Enable
Registers where '1' indicates that forwarding of the corresponding
interrupt is enabled and then write this value with a mask back where
'1' indicates disable the interrupt.
So diretly write one bit per time to enable or disable interrupt.
Fixes: cb573c2 ("arm: gic: Introduce gic_irq_set_clr_enable() helper")
Signed-off-by: Shaoqin Huang <shahuang@xxxxxxxxxx>
Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
lib/arm/gic.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/lib/arm/gic.c b/lib/arm/gic.c
index 1bfcfcf..89a15fe 100644
--- a/lib/arm/gic.c
+++ b/lib/arm/gic.c
@@ -176,7 +176,6 @@ void gic_ipi_send_mask(int irq, const cpumask_t *dest)
void gic_irq_set_clr_enable(int irq, bool enable)
{
u32 offset, split = 32, shift = (irq % 32);
- u32 reg, mask = BIT(shift);
void *base;
assert(irq < 1020);
@@ -199,8 +198,7 @@ void gic_irq_set_clr_enable(int irq, bool enable)
assert(0);
}
base += offset + (irq / split) * 4;
- reg = readl(base);
- writel(reg | mask, base);
+ writel(BIT(shift), base);
}
enum gic_irq_state gic_irq_state(int irq)
--
2.39.1
