From 663b8579cb3f10365e7606d115a051e502a5931b Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Mon, 9 Mar 2026 10:38:18 +0200 Subject: [PATCH] intel_idle: Add Panther Lake C-states table [Upstream commit d51de21b4c3a34a2cc592319df63864e14b18b29] 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 [ rjw: Changelog expansion ] Link: https://patch.msgid.link/20260309083818.79588-1-dedekind1@gmail.com Signed-off-by: Rafael J. Wysocki [Backport from v7.1] Signed-off-by: WangYuli --- drivers/idle/intel_idle.c | 42 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index 9ba83954c2555..361a8f7c75982 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -973,6 +973,43 @@ 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", @@ -1551,6 +1588,10 @@ 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, }; @@ -1659,6 +1700,7 @@ 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),