linux-kernel - [PATCH V2] soc: qcom: icc-bwmon: Update zone1_thres

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Message-Id: <20250905113923.3944347-1-quic_pussin@quicinc.com>
Date: Fri,  5 Sep 2025 17:09:23 +0530
From: Pushpendra Singh <quic_pussin@...cinc.com>
To: quic_bjorande@...cinc.com
Cc: andersson@...nel.org, krzysztof.kozlowski@...aro.org,
        konradybcio@...nel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_rgottimu@...cinc.com,
        Shivnandan Kumar <quic_kshivnan@...cinc.com>,
        Pushpendra Singh <quic_pussin@...cinc.com>
Subject: [PATCH V2] soc: qcom: icc-bwmon: Update zone1_thres_count to 3

From: Shivnandan Kumar <quic_kshivnan@...cinc.com>

Update zone1_thres_count to 3 from 16 so that
driver can reduce bus vote in 3 sample windows instead
of waiting for 16 windows.

The 16-window (64 ms) waiting time is too long to reduce the
bus vote. At higher FPS, there will be multiple frames in 64ms
e.g. 4 frames at 60FPS in 64ms. Hence, delay of 64ms in decision
making will lead to higher power regression. We tested across
multiple usecases, and observed significant power savings.

USECASE				zone1_thres_count=16     zone1_thres_count=3
4K video playback       236.15 mA                  203.15 mA
Sleep					   7mA			   			6.9mA
Display (dle display)    71.95mA			       67.11mA

Signed-off-by: Shivnandan Kumar <quic_kshivnan@...cinc.com>
Signed-off-by: Pushpendra Singh <quic_pussin@...cinc.com>
---
Changes in v2:
-Update commit message
-Link to v1:https://lore.kernel.org/lkml/463eb7c8-00fc-4441-91d1-6e48f6b052c8@quicinc.com

 drivers/soc/qcom/icc-bwmon.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/qcom/icc-bwmon.c b/drivers/soc/qcom/icc-bwmon.c
index 3dfa448bf8cf..a245a8b2cfef 100644
--- a/drivers/soc/qcom/icc-bwmon.c
+++ b/drivers/soc/qcom/icc-bwmon.c
@@ -827,7 +827,7 @@ static const struct icc_bwmon_data msm8998_bwmon_data = {
 static const struct icc_bwmon_data sdm845_cpu_bwmon_data = {
 	.sample_ms = 4,
 	.count_unit_kb = 64,
-	.zone1_thres_count = 16,
+	.zone1_thres_count = 3,
 	.zone3_thres_count = 1,
 	.quirks = BWMON_HAS_GLOBAL_IRQ,
 	.regmap_fields = sdm845_cpu_bwmon_reg_fields,
@@ -846,7 +846,7 @@ static const struct icc_bwmon_data sdm845_llcc_bwmon_data = {
 static const struct icc_bwmon_data sc7280_llcc_bwmon_data = {
 	.sample_ms = 4,
 	.count_unit_kb = 64,
-	.zone1_thres_count = 16,
+	.zone1_thres_count = 3,
 	.zone3_thres_count = 1,
 	.quirks = BWMON_NEEDS_FORCE_CLEAR,
 	.regmap_fields = sdm845_llcc_bwmon_reg_fields,
-- 
2.34.1