drm/virtio: drop virtio_gpu_fence_cleanup()

[linux-2.6-microblaze.git] / drivers / clocksource / i8253.c

diff --git a/drivers/clocksource/i8253.c b/drivers/clocksource/i8253.c
index 9c38895..d4350bb 100644 (file)
--- a/drivers/clocksource/i8253.c
+++ b/drivers/clocksource/i8253.c
@@ -20,6 +20,13 @@
 DEFINE_RAW_SPINLOCK(i8253_lock);
 EXPORT_SYMBOL(i8253_lock);
 
+/*
+ * Handle PIT quirk in pit_shutdown() where zeroing the counter register
+ * restarts the PIT, negating the shutdown. On platforms with the quirk,
+ * platform specific code can set this to false.
+ */
+bool i8253_clear_counter_on_shutdown __ro_after_init = true;
+
 #ifdef CONFIG_CLKSRC_I8253
 /*
  * Since the PIT overflows every tick, its not very useful
@@ -109,8 +116,11 @@ static int pit_shutdown(struct clock_event_device *evt)
        raw_spin_lock(&i8253_lock);
 
        outb_p(0x30, PIT_MODE);
-       outb_p(0, PIT_CH0);
-       outb_p(0, PIT_CH0);
+
+       if (i8253_clear_counter_on_shutdown) {
+               outb_p(0, PIT_CH0);
+               outb_p(0, PIT_CH0);
+       }
 
        raw_spin_unlock(&i8253_lock);
        return 0;