linux-kernel - [PATCH 4.9 076/152] x86/intel_idle: Add CPU model 0x4a (Atom Z34xx series)

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Date:   Mon, 10 Apr 2017 18:42:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Len Brown <len.brown@...el.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 076/152] x86/intel_idle: Add CPU model 0x4a (Atom Z34xx series)

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

[ Upstream commit 5e7ec268fd48d63cfd0e3a9be6c6443f01673bd4 ]

Add CPU ID for Atom Z34xx processors. Datasheets indicate support for this,
detailed information about potential quirks or limitations are missing, though.
So we just reuse the definition from official BSP code.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Len Brown <len.brown@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/idle/intel_idle.c |   49 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -724,6 +724,50 @@ static struct cpuidle_state atom_cstates
 	{
 		.enter = NULL }
 };
+static struct cpuidle_state tangier_cstates[] = {
+	{
+		.name = "C1-TNG",
+		.desc = "MWAIT 0x00",
+		.flags = MWAIT2flg(0x00),
+		.exit_latency = 1,
+		.target_residency = 4,
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
+	{
+		.name = "C4-TNG",
+		.desc = "MWAIT 0x30",
+		.flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED,
+		.exit_latency = 100,
+		.target_residency = 400,
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
+	{
+		.name = "C6-TNG",
+		.desc = "MWAIT 0x52",
+		.flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED,
+		.exit_latency = 140,
+		.target_residency = 560,
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
+	{
+		.name = "C7-TNG",
+		.desc = "MWAIT 0x60",
+		.flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
+		.exit_latency = 1200,
+		.target_residency = 4000,
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
+	{
+		.name = "C9-TNG",
+		.desc = "MWAIT 0x64",
+		.flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED,
+		.exit_latency = 10000,
+		.target_residency = 20000,
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
+	{
+		.enter = NULL }
+};
 static struct cpuidle_state avn_cstates[] = {
 	{
 		.name = "C1-AVN",
@@ -978,6 +1022,10 @@ static const struct idle_cpu idle_cpu_at
 	.state_table = atom_cstates,
 };
 
+static const struct idle_cpu idle_cpu_tangier = {
+	.state_table = tangier_cstates,
+};
+
 static const struct idle_cpu idle_cpu_lincroft = {
 	.state_table = atom_cstates,
 	.auto_demotion_disable_flags = ATM_LNC_C6_AUTO_DEMOTE,
@@ -1066,6 +1114,7 @@ static const struct x86_cpu_id intel_idl
 	ICPU(INTEL_FAM6_SANDYBRIDGE_X,		idle_cpu_snb),
 	ICPU(INTEL_FAM6_ATOM_CEDARVIEW,		idle_cpu_atom),
 	ICPU(INTEL_FAM6_ATOM_SILVERMONT1,	idle_cpu_byt),
+	ICPU(INTEL_FAM6_ATOM_MERRIFIELD,	idle_cpu_tangier),
 	ICPU(INTEL_FAM6_ATOM_AIRMONT,		idle_cpu_cht),
 	ICPU(INTEL_FAM6_IVYBRIDGE,		idle_cpu_ivb),
 	ICPU(INTEL_FAM6_IVYBRIDGE_X,		idle_cpu_ivt),