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authorMichael Kelley <mikelley@microsoft.com>2018-11-04 06:48:54 +0300
committerThomas Gleixner <tglx@linutronix.de>2018-11-04 13:04:46 +0300
commit35b69a420bfb56b7b74cb635ea903db05e357bec (patch)
tree61e86bf8c336ee41ba3c5f0cc4fa1fbed3686cc7 /include/linux/i8253.h
parent71e56028173bc84f01456a5679d8be9d681b49f1 (diff)
downloadlinux-35b69a420bfb56b7b74cb635ea903db05e357bec.tar.xz
clockevents/drivers/i8253: Add support for PIT shutdown quirk
Add support for platforms where pit_shutdown() doesn't work because of a quirk in the PIT emulation. On these platforms setting the counter register to zero causes the PIT to start running again, negating the shutdown. Provide a global variable that controls whether the counter register is zero'ed, which platform specific code can override. Signed-off-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org> Cc: "devel@linuxdriverproject.org" <devel@linuxdriverproject.org> Cc: "daniel.lezcano@linaro.org" <daniel.lezcano@linaro.org> Cc: "virtualization@lists.linux-foundation.org" <virtualization@lists.linux-foundation.org> Cc: "jgross@suse.com" <jgross@suse.com> Cc: "akataria@vmware.com" <akataria@vmware.com> Cc: "olaf@aepfle.de" <olaf@aepfle.de> Cc: "apw@canonical.com" <apw@canonical.com> Cc: vkuznets <vkuznets@redhat.com> Cc: "jasowang@redhat.com" <jasowang@redhat.com> Cc: "marcelo.cerri@canonical.com" <marcelo.cerri@canonical.com> Cc: KY Srinivasan <kys@microsoft.com> Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/1541303219-11142-2-git-send-email-mikelley@microsoft.com
Diffstat (limited to 'include/linux/i8253.h')
-rw-r--r--include/linux/i8253.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/i8253.h b/include/linux/i8253.h
index e6bb36a97519..8336b2f6f834 100644
--- a/include/linux/i8253.h
+++ b/include/linux/i8253.h
@@ -21,6 +21,7 @@
#define PIT_LATCH ((PIT_TICK_RATE + HZ/2) / HZ)
extern raw_spinlock_t i8253_lock;
+extern bool i8253_clear_counter_on_shutdown;
extern struct clock_event_device i8253_clockevent;
extern void clockevent_i8253_init(bool oneshot);