Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

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Hello.

Kumar Gala wrote:

Index: linux-2.6/arch/powerpc/kernel/time.c
===================================================================
--- linux-2.6.orig/arch/powerpc/kernel/time.c
+++ linux-2.6/arch/powerpc/kernel/time.c
[...]
@@ -128,6 +129,83 @@ unsigned long ppc_tb_freq;
 static u64 tb_last_jiffy __cacheline_aligned_in_smp;
 static DEFINE_PER_CPU(u64, last_jiffy);

+#ifdef CONFIG_GENERIC_CLOCKEVENTS
+
+#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
+#define DECREMENTER_MAX 0xffffffff
+#else
+#define DECREMENTER_MAX 0x7fffffff /* setting MSB triggers an interrupt */
+#endif
+
+static int decrementer_set_next_event(unsigned long evt,
+                      struct clock_event_device *dev)
+{
+#if defined(CONFIG_40x)
+ mtspr(SPRN_PIT, evt); /* 40x has a hidden PIT auto-reload register */
+#elif defined(CONFIG_BOOKE)
+ mtspr(SPRN_DECAR, evt); /* Book E has separate auto-reload register */
+    set_dec(evt);

what's the point of setting decar if you're just going to set_dec as  well?

   Bothered to read the Book E specs? ;-)
Loading DECAR doesn't auto-reload DEC. What I want is both set the auto-reload value and start counting down from it at the same time (if the decrementer is in auto-reload mode).

[big cut-off]

WBR, Sergei
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