linux-kernel - [PATCH 4/9] platform/x86: intel_pmc_core: Show LPM residency in microseconds

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Date:   Wed, 31 Mar 2021 20:05:53 -0700
From:   "David E. Box" <david.e.box@...ux.intel.com>
To:     irenic.rajneesh@...il.com, hdegoede@...hat.com,
        david.e.box@...ux.intel.com, mgross@...ux.intel.com,
        gayatri.kammela@...el.com
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/9] platform/x86: intel_pmc_core: Show LPM residency in microseconds

From: Gayatri Kammela <gayatri.kammela@...el.com>

Modify the low power mode (LPM or sub-state) residency counters to display
in microseconds just like the slp_s0_residency counter. The granularity of
the counter is approximately 30.5us per tick. Double this value then divide
by two to maintain accuracy.

Signed-off-by: Gayatri Kammela <gayatri.kammela@...el.com>
Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
---
 drivers/platform/x86/intel_pmc_core.c | 14 ++++++++++++--
 drivers/platform/x86/intel_pmc_core.h |  3 +++
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index ce300c2942d0..ba0db301f07b 100644
--- a/drivers/platform/x86/intel_pmc_core.c
+++ b/drivers/platform/x86/intel_pmc_core.c
@@ -578,6 +578,7 @@ static const struct pmc_reg_map tgl_reg_map = {
 	.pm_read_disable_bit = CNP_PMC_READ_DISABLE_BIT,
 	.ltr_ignore_max = TGL_NUM_IP_IGN_ALLOWED,
 	.lpm_num_maps = TGL_LPM_NUM_MAPS,
+	.lpm_res_counter_step_x2 = TGL_PMC_LPM_RES_COUNTER_STEP_X2,
 	.lpm_en_offset = TGL_LPM_EN_OFFSET,
 	.lpm_priority_offset = TGL_LPM_PRI_OFFSET,
 	.lpm_residency_offset = TGL_LPM_RESIDENCY_OFFSET,
@@ -1026,17 +1027,26 @@ static int pmc_core_ltr_show(struct seq_file *s, void *unused)
 }
 DEFINE_SHOW_ATTRIBUTE(pmc_core_ltr);
 
+static inline u64 adjust_lpm_residency(struct pmc_dev *pmcdev, u32 offset,
+				       const int lpm_adj_x2)
+{
+	u64 lpm_res = pmc_core_reg_read(pmcdev, offset);
+
+	return GET_X2_COUNTER((u64)lpm_adj_x2 * lpm_res);
+}
+
 static int pmc_core_substate_res_show(struct seq_file *s, void *unused)
 {
 	struct pmc_dev *pmcdev = s->private;
+	const int lpm_adj_x2 = pmcdev->map->lpm_res_counter_step_x2;
 	u32 offset = pmcdev->map->lpm_residency_offset;
 	int i, mode;
 
 	seq_printf(s, "%-10s %-15s\n", "Substate", "Residency");
 
 	pmc_for_each_mode(i, mode, pmcdev) {
-		seq_printf(s, "%-10s %-15u\n", pmc_lpm_modes[mode],
-			   pmc_core_reg_read(pmcdev, offset + (4 * mode)));
+		seq_printf(s, "%-10s %-15llu\n", pmc_lpm_modes[mode],
+			   adjust_lpm_residency(pmcdev, offset + (4 * mode), lpm_adj_x2));
 	}
 
 	return 0;
diff --git a/drivers/platform/x86/intel_pmc_core.h b/drivers/platform/x86/intel_pmc_core.h
index 5a4e3a49f5b1..3800c1ba6fb7 100644
--- a/drivers/platform/x86/intel_pmc_core.h
+++ b/drivers/platform/x86/intel_pmc_core.h
@@ -188,9 +188,11 @@ enum ppfear_regs {
 #define ICL_PMC_SLP_S0_RES_COUNTER_STEP		0x64
 
 #define LPM_MAX_NUM_MODES			8
+#define GET_X2_COUNTER(v)			((v) >> 1)
 
 #define TGL_NUM_IP_IGN_ALLOWED			22
 #define TGL_PMC_SLP_S0_RES_COUNTER_STEP		0x7A
+#define TGL_PMC_LPM_RES_COUNTER_STEP_X2		61	/* 30.5us * 2 */
 
 /*
  * Tigerlake Power Management Controller register offsets
@@ -263,6 +265,7 @@ struct pmc_reg_map {
 	const u32 pm_vric1_offset;
 	/* Low Power Mode registers */
 	const int lpm_num_maps;
+	const int lpm_res_counter_step_x2;
 	const u32 lpm_en_offset;
 	const u32 lpm_priority_offset;
 	const u32 lpm_residency_offset;
-- 
2.25.1