linux-kernel - [PATCH RFT] interconnect: qcom: icc-rpm: Fix peak rate calculation

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Date:   Tue, 5 Dec 2023 14:14:00 -0800
From:   Bjorn Andersson <quic_bjorande@...cinc.com>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Georgi Djakov <djakov@...nel.org>
CC:     <linux-arm-msm@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
        Bjorn Andersson <quic_bjorande@...cinc.com>
Subject: [PATCH RFT] interconnect: qcom: icc-rpm: Fix peak rate calculation

Per the commit message of commit 'dd014803f260 ("interconnect: qcom:
icc-rpm: Add AB/IB calculations coefficients")', the peak rate should be
100/ib_percent. But, in what looks like a typical typo, the numerator
value is discarded in the calculation.

Update the implementation to match the described intention.

Fixes: dd014803f260 ("interconnect: qcom: icc-rpm: Add AB/IB calculations coefficients")
Cc: stable@...r.kernel.org
Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
---
Spotted while reading the code, patch is untested.
---
 drivers/interconnect/qcom/icc-rpm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
index fb54e78f8fd7..a8ed435f696c 100644
--- a/drivers/interconnect/qcom/icc-rpm.c
+++ b/drivers/interconnect/qcom/icc-rpm.c
@@ -307,7 +307,7 @@ static u64 qcom_icc_calc_rate(struct qcom_icc_provider *qp, struct qcom_icc_node
 
 	if (qn->ib_coeff) {
 		agg_peak_rate = qn->max_peak[ctx] * 100;
-		agg_peak_rate = div_u64(qn->max_peak[ctx], qn->ib_coeff);
+		agg_peak_rate = div_u64(agg_peak_rate, qn->ib_coeff);
 	} else {
 		agg_peak_rate = qn->max_peak[ctx];
 	}

---
base-commit: 0f5f12ac05f36f117e793656c3f560625e927f1b
change-id: 20231205-qcom_icc_calc_rate-typo-a1542df4f222

Best regards,
-- 
Bjorn Andersson <quic_bjorande@...cinc.com>