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intel_idle: Add Panther Lake C-states table

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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: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
[ rjw: Changelog expansion ]
Link: https://patch.msgid.link/20260309083818.79588-1-dedekind1@gmail.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Artem Bityutskiy
2026-03-09 10:38:18 +02:00
committed by Rafael J. Wysocki
parent 106a2662e6
commit d51de21b4c
1 changed files with 42 additions and 0 deletions
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42
drivers/idle/intel_idle.c
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@@ -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),