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authorLinus Torvalds <torvalds@linux-foundation.org>2012-12-19 12:56:42 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-19 12:56:42 -0800
commit3dbff0d5e8ec9e6d0834ea889d496bc724743dfd (patch)
tree30af8010ac1d9e0478831e0e0334dc7e12db8a8d
parentca2a88f56aa385890c7fd4ce9d2722b0848ca990 (diff)
parentcd34ab8b16ffaa9753d85adb4fb6cd98e7e1d22a (diff)
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull small x86 fixes from Peter Anvin: "A collection of very small fixes, mostly pure documentation." * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, doc: Document that bootloader ID 4 is used also by iPXE x86, doc: Add a formal bootloader ID for kexec-tools x86, 8042: Enable A20 using KBC to fix S3 resume on some MSI laptops
-rw-r--r--Documentation/x86/boot.txt3
-rw-r--r--drivers/input/serio/i8042-x86ia64io.h9
2 files changed, 11 insertions, 1 deletions
diff --git a/Documentation/x86/boot.txt b/Documentation/x86/boot.txt
index f15cb74c4f7..406d82d5d2b 100644
--- a/Documentation/x86/boot.txt
+++ b/Documentation/x86/boot.txt
@@ -373,7 +373,7 @@ Protocol: 2.00+
1 Loadlin
2 bootsect-loader (0x20, all other values reserved)
3 Syslinux
- 4 Etherboot/gPXE
+ 4 Etherboot/gPXE/iPXE
5 ELILO
7 GRUB
8 U-Boot
@@ -381,6 +381,7 @@ Protocol: 2.00+
A Gujin
B Qemu
C Arcturus Networks uCbootloader
+ D kexec-tools
E Extended (see ext_loader_type)
F Special (0xFF = undefined)
10 Reserved
diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
index d6cc77a53c7..5f306f79da0 100644
--- a/drivers/input/serio/i8042-x86ia64io.h
+++ b/drivers/input/serio/i8042-x86ia64io.h
@@ -921,6 +921,7 @@ static int __init i8042_platform_init(void)
int retval;
#ifdef CONFIG_X86
+ u8 a20_on = 0xdf;
/* Just return if pre-detection shows no i8042 controller exist */
if (!x86_platform.i8042_detect())
return -ENODEV;
@@ -960,6 +961,14 @@ static int __init i8042_platform_init(void)
if (dmi_check_system(i8042_dmi_dritek_table))
i8042_dritek = true;
+
+ /*
+ * A20 was already enabled during early kernel init. But some buggy
+ * BIOSes (in MSI Laptops) require A20 to be enabled using 8042 to
+ * resume from S3. So we do it here and hope that nothing breaks.
+ */
+ i8042_command(&a20_on, 0x10d1);
+ i8042_command(NULL, 0x00ff); /* Null command for SMM firmware */
#endif /* CONFIG_X86 */
return retval;