From: Pavel Machek <pavel@ucw.cz>
To: Andrew Morton <akpm@zip.com.au>,
kernel list <linux-kernel@vger.kernel.org>
Subject: suspend/resume support for PIT (time.c)
Date: Sat, 10 Jan 2004 21:03:32 +0100 [thread overview]
Message-ID: <20040110200332.GA1327@elf.ucw.cz> (raw)
Hi!
This adds proper suspend/resume support for PIT. That means that clock
are actually correct after suspend/resume. Please apply,
Pavel
Index: linux/arch/i386/kernel/time.c
===================================================================
--- linux.orig/arch/i386/kernel/time.c 2004-01-09 20:26:08.000000000 +0100
+++ linux/arch/i386/kernel/time.c 2004-01-09 20:33:05.000000000 +0100
@@ -307,7 +307,30 @@
return retval;
}
+static long clock_cmos_diff;
+
+static int pit_suspend(struct sys_device *dev, u32 state)
+{
+ /*
+ * Estimate time zone so that set_time can update the clock
+ */
+ clock_cmos_diff = -get_cmos_time();
+ clock_cmos_diff += get_seconds();
+ return 0;
+}
+
+static int pit_resume(struct sys_device *dev)
+{
+ write_seqlock_irq(&xtime_lock);
+ xtime.tv_sec = get_cmos_time() + clock_cmos_diff;
+ xtime.tv_nsec = 0;
+ write_sequnlock_irq(&xtime_lock);
+ return 0;
+}
+
static struct sysdev_class pit_sysclass = {
+ .resume = pit_resume,
+ .suspend = pit_suspend,
set_kset_name("pit"),
};
--
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
next reply other threads:[~2004-01-10 20:02 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-10 20:03 Pavel Machek [this message]
2004-01-10 22:46 ` suspend/resume support for PIT (time.c) Andrew Morton
2004-01-11 11:53 ` Pavel Machek
2004-01-12 18:33 ` john stultz
2004-01-12 22:39 ` Pavel Machek
2004-01-12 23:12 ` Andrew Morton
2004-01-12 23:14 ` Pavel Machek
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