Commit d51de21b authored by Artem Bityutskiy's avatar Artem Bityutskiy Committed by Rafael J. Wysocki
Browse files

intel_idle: Add Panther Lake C-states table 



Panther Lake supports the following requestable C-states: C1, C1E, C6S,
C10.

The parameters of these C-states should be consistent across all
systems based on Panther Lake, so add a custom C-states table for it
that will override C-state parameters supplied by platform firmware
that may vary from one platform to another and may not represent the
most optimum choice.

Signed-off-by: default avatarArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
[ rjw: Changelog expansion ]
Link: https://patch.msgid.link/20260309083818.79588-1-dedekind1@gmail.com


Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 106a2662

drivers/idle/intel_idle.c

+42 −0
Original line number Diff line number Diff line
@@ -983,6 +983,43 @@ static struct cpuidle_state mtl_l_cstates[] __initdata = { 
		.enter = NULL }

};



static struct cpuidle_state ptl_cstates[] __initdata = {

	{

		.name = "C1",

		.desc = "MWAIT 0x00",

		.flags = MWAIT2flg(0x00),

		.exit_latency = 1,

		.target_residency = 1,

		.enter = &intel_idle,

		.enter_s2idle = intel_idle_s2idle, },

	{

		.name = "C1E",

		.desc = "MWAIT 0x01",

		.flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,

		.exit_latency = 10,

		.target_residency = 10,

		.enter = &intel_idle,

		.enter_s2idle = intel_idle_s2idle, },

	{

		.name = "C6S",

		.desc = "MWAIT 0x21",

		.flags = MWAIT2flg(0x21) | CPUIDLE_FLAG_TLB_FLUSHED,

		.exit_latency = 300,

		.target_residency = 300,

		.enter = &intel_idle,

		.enter_s2idle = intel_idle_s2idle, },

	{

		.name = "C10",

		.desc = "MWAIT 0x60",

		.flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,

		.exit_latency = 370,

		.target_residency = 2500,

		.enter = &intel_idle,

		.enter_s2idle = intel_idle_s2idle, },

	{

		.enter = NULL }

};



static struct cpuidle_state gmt_cstates[] __initdata = {

	{

		.name = "C1",
@@ -1561,6 +1598,10 @@ static const struct idle_cpu idle_cpu_mtl_l __initconst = { 
	.state_table = mtl_l_cstates,

};



static const struct idle_cpu idle_cpu_ptl __initconst = {

	.state_table = ptl_cstates,

};



static const struct idle_cpu idle_cpu_gmt __initconst = {

	.state_table = gmt_cstates,

};
@@ -1669,6 +1710,7 @@ static const struct x86_cpu_id intel_idle_ids[] __initconst = { 
	X86_MATCH_VFM(INTEL_ALDERLAKE,		&idle_cpu_adl),

	X86_MATCH_VFM(INTEL_ALDERLAKE_L,	&idle_cpu_adl_l),

	X86_MATCH_VFM(INTEL_METEORLAKE_L,	&idle_cpu_mtl_l),

	X86_MATCH_VFM(INTEL_PANTHERLAKE_L,	&idle_cpu_ptl),

	X86_MATCH_VFM(INTEL_ATOM_GRACEMONT,	&idle_cpu_gmt),

	X86_MATCH_VFM(INTEL_SAPPHIRERAPIDS_X,	&idle_cpu_spr),

	X86_MATCH_VFM(INTEL_EMERALDRAPIDS_X,	&idle_cpu_spr),