From: Andrew Jeffery <andrew@aj.id.au>
Date: Mon, 1 Jul 2019 16:26:17 +0000 (+0100)
Subject: aspeed/timer: Fix match calculations
X-Git-Tag: v4.1.0-rc0~31^2~29
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=696942b8bc6562a2b23c6ed8ae32ecdeb9bf4b60;p=thirdparty%2Fqemu.git

aspeed/timer: Fix match calculations

If the match value exceeds reload then we don't want to include it in
calculations for the next event.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20190618165311.27066-10-clg@kaod.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---

diff --git a/hw/timer/aspeed_timer.c b/hw/timer/aspeed_timer.c
index 8d6266b0fd8..745eb8608b5 100644
--- a/hw/timer/aspeed_timer.c
+++ b/hw/timer/aspeed_timer.c
@@ -107,6 +107,11 @@ static inline uint64_t calculate_time(struct AspeedTimer *t, uint32_t ticks)
     return t->start + delta_ns;
 }
 
+static inline uint32_t calculate_match(struct AspeedTimer *t, int i)
+{
+    return t->match[i] < t->reload ? t->match[i] : 0;
+}
+
 static uint64_t calculate_next(struct AspeedTimer *t)
 {
     uint64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
@@ -118,12 +123,12 @@ static uint64_t calculate_next(struct AspeedTimer *t)
      * the timer counts down to zero.
      */
 
-    next = calculate_time(t, MAX(t->match[0], t->match[1]));
+    next = calculate_time(t, MAX(calculate_match(t, 0), calculate_match(t, 1)));
     if (now < next) {
         return next;
     }
 
-    next = calculate_time(t, MIN(t->match[0], t->match[1]));
+    next = calculate_time(t, MIN(calculate_match(t, 0), calculate_match(t, 1)));
     if (now < next) {
         return next;
     }
@@ -141,8 +146,10 @@ static uint64_t calculate_next(struct AspeedTimer *t)
         qemu_set_irq(t->irq, t->level);
     }
 
+    next = MAX(MAX(calculate_match(t, 0), calculate_match(t, 1)), 0);
     t->start = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
-    return calculate_time(t, MAX(MAX(t->match[0], t->match[1]), 0));
+
+    return calculate_time(t, next);
 }
 
 static void aspeed_timer_mod(AspeedTimer *t)