Prior to Tiger Lake, the platforms that support pmc_core have no
sub-states of S0ix. Tiger Lake has 8 sub-states/low power modes of S0ix
ranging from S0i2.0-S0i2.2 and S0i3.0-S0i3.4, simply represented as
S0ix.y.
Create a debugfs entry to access residency of each sub-state.
Cc: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: David Box <david.e.box@xxxxxxxxx>
Signed-off-by: David Box <david.e.box@xxxxxxxxx>
Signed-off-by: Gayatri Kammela <gayatri.kammela@xxxxxxxxx>
---
drivers/platform/x86/intel_pmc_core.c | 28 +++++++++++++++++++++++++++
drivers/platform/x86/intel_pmc_core.h | 21 ++++++++++++++++++++
2 files changed, 49 insertions(+)
diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index 017776551cc5..6e7cf620bea6 100644
--- a/drivers/platform/x86/intel_pmc_core.c
+++ b/drivers/platform/x86/intel_pmc_core.c
@@ -422,6 +422,8 @@ static const struct pmc_reg_map tgl_reg_map = {
.pm_cfg_offset = CNP_PMC_PM_CFG_OFFSET,
.pm_read_disable_bit = CNP_PMC_READ_DISABLE_BIT,
.ltr_ignore_max = TGL_NUM_IP_IGN_ALLOWED,
+ .lpm_en_offset = TGL_LPM_EN_OFFSET,
+ .lpm_residency_offset = TGL_LPM_RESIDENCY_OFFSET,
};
static inline u8 pmc_core_reg_read_byte(struct pmc_dev *pmcdev, int offset)
@@ -793,6 +795,26 @@ static int pmc_core_ltr_show(struct seq_file *s, void *unused)
}
DEFINE_SHOW_ATTRIBUTE(pmc_core_ltr);
+static int pmc_core_substate_res_show(struct seq_file *s, void *unused)
+{
+ struct pmc_dev *pmcdev = s->private;
+ u32 offset = pmcdev->map->lpm_residency_offset;
+ u32 lpm_en;
+ int index;
+
+ lpm_en = pmc_core_reg_read(pmcdev, pmcdev->map->lpm_en_offset);
+ seq_printf(s, "status substate residency\n");
+ for (index = 0; lpm_modes[index]; index++) {
+ seq_printf(s, "%7s %7s %-15u\n",
+ BIT(index) & lpm_en ? "Enabled" : " ",
+ lpm_modes[index], pmc_core_reg_read(pmcdev, offset));
+ offset += 4;
+ }
+
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(pmc_core_substate_res);
+
static int pmc_core_pkgc_show(struct seq_file *s, void *unused)
{
struct pmc_dev *pmcdev = s->private;
@@ -858,6 +880,12 @@ static void pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
debugfs_create_bool("slp_s0_dbg_latch", 0644,
dir, &slps0_dbg_latch);
}
+
+ if (pmcdev->map->lpm_en_offset) {
+ debugfs_create_file("substate_residencies", 0444,
+ pmcdev->dbgfs_dir, pmcdev,
+ &pmc_core_substate_res_fops);
+ }
}
#else
static inline void pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
diff --git a/drivers/platform/x86/intel_pmc_core.h b/drivers/platform/x86/intel_pmc_core.h
index f1a0792b3f91..ff1b2645d9b4 100644
--- a/drivers/platform/x86/intel_pmc_core.h
+++ b/drivers/platform/x86/intel_pmc_core.h
@@ -188,6 +188,24 @@ enum ppfear_regs {
#define TGL_NUM_IP_IGN_ALLOWED 22
+/*
+ * Tigerlake Power Management Controller register offsets
+ */
+#define TGL_LPM_EN_OFFSET 0x1C78
+#define TGL_LPM_RESIDENCY_OFFSET 0x1C80
+
+const char *lpm_modes[] = {
+ "S0i2.0",
+ "S0i2.1",
+ "S0i2.2",
+ "S0i3.0",
+ "S0i3.1",
+ "S0i3.2",
+ "S0i3.3",
+ "S0i3.4",
+ NULL
+};
+
struct pmc_bit_map {
const char *name;
u32 bit_mask;
@@ -231,6 +249,9 @@ struct pmc_reg_map {
const u32 slps0_dbg_offset;
const u32 ltr_ignore_max;
const u32 pm_vric1_offset;
+ /* Low Power Mode registers */
+ const u32 lpm_en_offset;
+ const u32 lpm_residency_offset;
};
/**
--
2.17.1
