| Message ID | 20231205-qcom_icc_calc_rate-typo-v1-1-9d4378dcf53e@quicinc.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere, archived |
| Headers | show |
| Series | [RFT] interconnect: qcom: icc-rpm: Fix peak rate calculation | expand |
On 12/5/23 23:14, Bjorn Andersson wrote: > 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@vger.kernel.org > Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.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); Oh fun.. I'dve assumed the compiler is smart enough to catch this Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org> Konrad
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]; }
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@vger.kernel.org Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com> --- Spotted while reading the code, patch is untested. --- drivers/interconnect/qcom/icc-rpm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- base-commit: 0f5f12ac05f36f117e793656c3f560625e927f1b change-id: 20231205-qcom_icc_calc_rate-typo-a1542df4f222 Best regards,