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authorFeng Tang <feng.tang@intel.com>2010-07-05 19:03:18 +0400
committerH. Peter Anvin <hpa@linux.intel.com>2010-07-08 04:05:06 +0400
commitc516ac583973196162b1ba7e4d597d6f6892dac0 (patch)
treed35de959d3114a6b08992add2fd268698a294a5b /arch
parent72550b3ae545c75897c769d43d62d4be3f3d48fe (diff)
downloadlinux-c516ac583973196162b1ba7e4d597d6f6892dac0.tar.xz
x86: Add i8042 pre-detection hook to x86_platform_ops
Some x86 platforms like Intel MID platforms don't have i8042 controllers, and i8042 driver's probe to some legacy IO ports may hang the MID processor. With this hook, i8042 driver can runtime check and skip the probe when the pretection fail which also saves some probe time [ hpa note: this is currently a compile-time check, which breaks the i386 allyesconfig build. This patch series thus does fix a regression. ] Signed-off-by: Feng Tang <feng.tang@intel.com> LKML-Reference: <1278342202-10973-2-git-send-email-feng.tang@intel.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/include/asm/x86_init.h2
-rw-r--r--arch/x86/kernel/x86_init.c4
2 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index 519b54327d75..baa579c8e038 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -142,6 +142,7 @@ struct x86_cpuinit_ops {
* @set_wallclock: set time back to HW clock
* @is_untracked_pat_range exclude from PAT logic
* @nmi_init enable NMI on cpus
+ * @i8042_detect pre-detect if i8042 controller exists
*/
struct x86_platform_ops {
unsigned long (*calibrate_tsc)(void);
@@ -150,6 +151,7 @@ struct x86_platform_ops {
void (*iommu_shutdown)(void);
bool (*is_untracked_pat_range)(u64 start, u64 end);
void (*nmi_init)(void);
+ int (*i8042_detect)(void);
};
extern struct x86_init_ops x86_init;
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index ebfb8e4c9f22..cd6da6bf3eca 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -86,6 +86,7 @@ struct x86_cpuinit_ops x86_cpuinit __cpuinitdata = {
};
static void default_nmi_init(void) { };
+static int default_i8042_detect(void) { return 1; };
struct x86_platform_ops x86_platform = {
.calibrate_tsc = native_calibrate_tsc,
@@ -93,7 +94,8 @@ struct x86_platform_ops x86_platform = {
.set_wallclock = mach_set_rtc_mmss,
.iommu_shutdown = iommu_shutdown_noop,
.is_untracked_pat_range = is_ISA_range,
- .nmi_init = default_nmi_init
+ .nmi_init = default_nmi_init,
+ .i8042_detect = default_i8042_detect
};
EXPORT_SYMBOL_GPL(x86_platform);