[PULL kvm-unit-tests 03/17] arm/arm64: PL031: Fix check_rtc_irq

[Andrew Jones <drjones@redhat.com>]

Since QEMU commit 83ad95957c7e ("pl031: Expose RTCICR as proper WC
register") the PL031 test gets into an infinite loop. Now we must
write bit zero of RTCICR to clear the IRQ status. Before, writing
anything to RTCICR would work. As '1' is a member of 'anything'
writing it should work for old QEMU as well.

Cc: Alexander Graf <graf@amazon.com>
Signed-off-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Alexander Graf <graf@amazon.com>
---
 arm/pl031.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arm/pl031.c b/arm/pl031.c
index a6adf6845f55..86035fa407e6 100644
--- a/arm/pl031.c
+++ b/arm/pl031.c
@@ -143,8 +143,8 @@ static void irq_handler(struct pt_regs *regs)
 		report(readl(&pl031->ris) == 1, "  RTC RIS == 1");
 		report(readl(&pl031->mis) == 1, "  RTC MIS == 1");
 
-		/* Writing any value should clear IRQ status */
-		writel(0x80000000ULL, &pl031->icr);
+		/* Writing one to bit zero should clear IRQ status */
+		writel(1, &pl031->icr);
 
 		report(readl(&pl031->ris) == 0, "  RTC RIS == 0");
 		report(readl(&pl031->mis) == 0, "  RTC MIS == 0");
-- 
2.21.0