interconnect: qcom: icc-rpm: Check for node-specific rate coefficients

Some nodes may have different coefficients than the general values for
bus they're attached to. Check for that and use them if present. See
[1], [2] for reference.

[1] sonyxperiadev/kernel@7456d97
[2] artem/android_kernel_sony_msm8996@bf7a898
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230726-topic-icc_coeff-v4-4-c04b60caa467@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>

Author: konradybcio

drivers/interconnect/qcom/icc-rpm.c

@@ -300,14 +300,14 @@ static u64 qcom_icc_calc_rate(struct qcom_icc_provider *qp, struct qcom_icc_node
 	else
 		agg_avg_rate = qn->sum_avg[ctx];
 
-	if (qp->ab_coeff) {
-		agg_avg_rate = agg_avg_rate * qp->ab_coeff;
+	if (qn->ab_coeff) {
+		agg_avg_rate = agg_avg_rate * qn->ab_coeff;
 		agg_avg_rate = div_u64(agg_avg_rate, 100);
 	}
 
-	if (qp->ib_coeff) {
+	if (qn->ib_coeff) {
 		agg_peak_rate = qn->max_peak[ctx] * 100;
-		agg_peak_rate = div_u64(qn->max_peak[ctx], qp->ib_coeff);
+		agg_peak_rate = div_u64(qn->max_peak[ctx], qn->ib_coeff);
 	} else {
 		agg_peak_rate = qn->max_peak[ctx];
 	}
@@ -563,6 +563,12 @@ int qnoc_probe(struct platform_device *pdev)
 	for (i = 0; i < num_nodes; i++) {
 		size_t j;
 
+		if (!qnodes[i]->ab_coeff)
+			qnodes[i]->ab_coeff = qp->ab_coeff;
+
+		if (!qnodes[i]->ib_coeff)
+			qnodes[i]->ib_coeff = qp->ib_coeff;
+
 		node = icc_node_create(qnodes[i]->id);
 		if (IS_ERR(node)) {
 			ret = PTR_ERR(node);

drivers/interconnect/qcom/icc-rpm.h

@@ -103,6 +103,8 @@ struct qcom_icc_qos {
  * @mas_rpm_id:	RPM id for devices that are bus masters
  * @slv_rpm_id:	RPM id for devices that are bus slaves
  * @qos: NoC QoS setting parameters
+ * @ab_coeff: a percentage-based coefficient for compensating the AB calculations
+ * @ib_coeff: an inverse-percentage-based coefficient for compensating the IB calculations
  * @bus_clk_rate: a pointer to an array containing bus clock rates in Hz
  */
 struct qcom_icc_node {
@@ -118,6 +120,8 @@ struct qcom_icc_node {
 	int mas_rpm_id;
 	int slv_rpm_id;
 	struct qcom_icc_qos qos;
+	u16 ab_coeff;
+	u16 ib_coeff;
 	u32 bus_clk_rate[QCOM_SMD_RPM_STATE_NUM];
 };