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From: "David E. Box" <david.e.box@linux.intel.com>
To: grub-devel@gnu.org
Subject: [PATCH v2] tsc: Change default tsc calibration method to pmtimer on EFI systems
Date: Fri, 15 Sep 2017 15:37:05 -0700	[thread overview]
Message-ID: <20170915223705.20758-1-david.e.box@linux.intel.com> (raw)

On efi systems, make pmtimer based tsc calibration the default over the
pit. This prevents Grub from hanging on Intel SoC systems that power gate
the pit.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
---
ChangeLog:

v2: Make pmtimer the default. Keep the rest in the original order.

v1: Make efi timer the default followed by the pmtimer.

 grub-core/kern/i386/tsc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/grub-core/kern/i386/tsc.c b/grub-core/kern/i386/tsc.c
index 2e85289d8..5b9da7c86 100644
--- a/grub-core/kern/i386/tsc.c
+++ b/grub-core/kern/i386/tsc.c
@@ -68,7 +68,7 @@ grub_tsc_init (void)
 #ifdef GRUB_MACHINE_XEN
   (void) (grub_tsc_calibrate_from_xen () || calibrate_tsc_hardcode());
 #elif defined (GRUB_MACHINE_EFI)
-  (void) (grub_tsc_calibrate_from_pit () || grub_tsc_calibrate_from_pmtimer () || grub_tsc_calibrate_from_efi() || calibrate_tsc_hardcode());
+  (void) (grub_tsc_calibrate_from_pmtimer () || grub_tsc_calibrate_from_pit () || grub_tsc_calibrate_from_efi() || calibrate_tsc_hardcode());
 #elif defined (GRUB_MACHINE_COREBOOT)
   (void) (grub_tsc_calibrate_from_pmtimer () || grub_tsc_calibrate_from_pit () || calibrate_tsc_hardcode());
 #else
-- 
2.13.5



             reply	other threads:[~2017-09-15 22:37 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-15 22:37 David E. Box [this message]
2017-09-28 20:51 ` [PATCH v2] tsc: Change default tsc calibration method to pmtimer on EFI systems Daniel Kiper
2017-10-06 15:02   ` Daniel Kiper

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