[CPUFREQ][4/8] acpi-cpufreq: Mark speedstep-centrino ACPI as deprecated

Mark ACPI hooks in speedstep-centrino as deprecated. Change the order in which
speedstep-centrino and acpi-cpufreq (when both are in kernel) will be
added. First driver to be tried is now acpi-cpufreq, followed by
speedstep-centrino.

Add a note in feature-removal-schedule to mark this deprecation.

Signed-off-by: Denis Sadykov <denis.m.sadykov@intel.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Dave Jones <davej@redhat.com>

6 files changed, 37 insertions, 4 deletions

diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 24f3c63b3017..7ebca0775ec1 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -280,3 +280,25 @@ Why:	Orphaned for ages.  SMP bugs long unfixed.  Few users left
 Who:	Jeff Garzik <jeff@garzik.org>
 
 ---------------------------
+
+What:	ACPI hooks (X86_SPEEDSTEP_CENTRINO_ACPI) in speedstep-centrino driver
+When:	December 2006
+Why:	Speedstep-centrino driver with ACPI hooks and acpi-cpufreq driver are
+	functionally very much similar. They talk to ACPI in same way. Only
+	difference between them is the way they do frequency transitions.
+	One uses MSRs and the other one uses IO ports. Functionaliy of
+	speedstep_centrino with ACPI hooks is now merged into acpi-cpufreq.
+	That means one common driver will support all Intel Enhanced Speedstep
+	capable CPUs. That means less confusion over name of
+	speedstep-centrino driver (with that driver supposed to be used on
+	non-centrino platforms). That means less duplication of code and
+	less maintenance effort and no possibility of these two drivers
+	going out of sync.
+	Current users of speedstep_centrino with ACPI hooks are requested to
+	switch over to acpi-cpufreq driver. speedstep-centrino will continue
+	to work using older non-ACPI static table based scheme even after this
+	date.
+
+Who:	Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
+
+---------------------------
diff --git a/arch/i386/kernel/cpu/cpufreq/Kconfig b/arch/i386/kernel/cpu/cpufreq/Kconfig
index ccc1edff5c97..5299c5bf4454 100644
--- a/arch/i386/kernel/cpu/cpufreq/Kconfig
+++ b/arch/i386/kernel/cpu/cpufreq/Kconfig
@@ -17,6 +17,7 @@ config X86_ACPI_CPUFREQ
 	help
 	  This driver adds a CPUFreq driver which utilizes the ACPI
 	  Processor Performance States.
+	  This driver also supports Intel Enhanced Speedstep.
 
 	  For details, take a look at <file:Documentation/cpu-freq/>.
 
@@ -121,11 +122,14 @@ config X86_SPEEDSTEP_CENTRINO
 	  If in doubt, say N.
 
 config X86_SPEEDSTEP_CENTRINO_ACPI
-	bool "Use ACPI tables to decode valid frequency/voltage pairs"
+	bool "Use ACPI tables to decode valid frequency/voltage (deprecated)"
 	depends on X86_SPEEDSTEP_CENTRINO && ACPI_PROCESSOR
 	depends on !(X86_SPEEDSTEP_CENTRINO = y && ACPI_PROCESSOR = m)
 	default y
 	help
+	  This is deprecated and this functionality is now merged into
+	  acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
+	  speedstep_centrino.
 	  Use primarily the information provided in the BIOS ACPI tables
 	  to determine valid CPU frequency and voltage pairings. It is
 	  required for the driver to work on non-Banias CPUs.
diff --git a/arch/i386/kernel/cpu/cpufreq/Makefile b/arch/i386/kernel/cpu/cpufreq/Makefile
index 2e894f1c8910..8de3abe322a9 100644
--- a/arch/i386/kernel/cpu/cpufreq/Makefile
+++ b/arch/i386/kernel/cpu/cpufreq/Makefile
@@ -7,9 +7,9 @@ obj-$(CONFIG_SC520_CPUFREQ)		+= sc520_freq.o
 obj-$(CONFIG_X86_LONGRUN)		+= longrun.o  
 obj-$(CONFIG_X86_GX_SUSPMOD)		+= gx-suspmod.o
 obj-$(CONFIG_X86_SPEEDSTEP_ICH)		+= speedstep-ich.o
-obj-$(CONFIG_X86_SPEEDSTEP_CENTRINO)	+= speedstep-centrino.o
 obj-$(CONFIG_X86_SPEEDSTEP_LIB)		+= speedstep-lib.o
 obj-$(CONFIG_X86_SPEEDSTEP_SMI)		+= speedstep-smi.o
 obj-$(CONFIG_X86_ACPI_CPUFREQ)		+= acpi-cpufreq.o
+obj-$(CONFIG_X86_SPEEDSTEP_CENTRINO)	+= speedstep-centrino.o
 obj-$(CONFIG_X86_P4_CLOCKMOD)		+= p4-clockmod.o
 obj-$(CONFIG_X86_CPUFREQ_NFORCE2)	+= cpufreq-nforce2.o
diff --git a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
index e8993baf3d14..70178bf8002d 100644
--- a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
+++ b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
@@ -531,6 +531,9 @@ static int centrino_cpu_init_acpi(struct cpufreq_policy *policy)
 
 	/* notify BIOS that we exist */
 	acpi_processor_notify_smm(THIS_MODULE);
+	printk("speedstep-centrino with X86_SPEEDSTEP_CENTRINO_ACPI"
+			"config is deprecated.\n "
+			"Use X86_ACPI_CPUFREQ (acpi-cpufreq instead.\n" );
 
 	return 0;
 
diff --git a/arch/x86_64/kernel/cpufreq/Kconfig b/arch/x86_64/kernel/cpufreq/Kconfig
index 81f1562e5393..3abcfa3e1ed7 100644
--- a/arch/x86_64/kernel/cpufreq/Kconfig
+++ b/arch/x86_64/kernel/cpufreq/Kconfig
@@ -27,10 +27,13 @@ config X86_POWERNOW_K8_ACPI
 	default y
 
 config X86_SPEEDSTEP_CENTRINO
-	tristate "Intel Enhanced SpeedStep"
+	tristate "Intel Enhanced SpeedStep (deprecated)"
 	select CPU_FREQ_TABLE
 	depends on ACPI_PROCESSOR
 	help
+	  This is deprecated and this functionality is now merged into
+	  acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
+	  speedstep_centrino.
 	  This adds the CPUFreq driver for Enhanced SpeedStep enabled
 	  mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
 	  or 64bit enabled Intel Xeons.
@@ -50,6 +53,7 @@ config X86_ACPI_CPUFREQ
 	help
 	  This driver adds a CPUFreq driver which utilizes the ACPI
 	  Processor Performance States.
+	  This driver also supports Intel Enhanced Speedstep.
 
 	  For details, take a look at <file:Documentation/cpu-freq/>.
 
diff --git a/arch/x86_64/kernel/cpufreq/Makefile b/arch/x86_64/kernel/cpufreq/Makefile
index d8b593879224..753ce1dd418e 100644
--- a/arch/x86_64/kernel/cpufreq/Makefile
+++ b/arch/x86_64/kernel/cpufreq/Makefile
@@ -5,8 +5,8 @@
 SRCDIR := ../../../i386/kernel/cpu/cpufreq
 
 obj-$(CONFIG_X86_POWERNOW_K8) += powernow-k8.o
-obj-$(CONFIG_X86_SPEEDSTEP_CENTRINO) += speedstep-centrino.o
 obj-$(CONFIG_X86_ACPI_CPUFREQ) += acpi-cpufreq.o
+obj-$(CONFIG_X86_SPEEDSTEP_CENTRINO) += speedstep-centrino.o
 obj-$(CONFIG_X86_P4_CLOCKMOD) += p4-clockmod.o
 obj-$(CONFIG_X86_SPEEDSTEP_LIB) += speedstep-lib.o