linux-kernel - [PATCH v3 2/9] interconnect: qcom: rpm: Always set QoS params on QNoC

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Message-Id: <20230116132152.405535-3-konrad.dybcio@linaro.org>
Date:   Mon, 16 Jan 2023 14:21:45 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     linux-arm-msm@...r.kernel.org, andersson@...nel.org,
        agross@...nel.org, krzysztof.kozlowski@...aro.org
Cc:     marijn.suijten@...ainline.org, bryan.odonoghue@...aro.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Georgi Djakov <djakov@...nel.org>,
        AngeloGioacchino Del Regno <kholk11@...il.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/9] interconnect: qcom: rpm: Always set QoS params on QNoC

On newer SoCs, QoS parameters and RPM bandwidth requests are wholly
separate. Setting one should only depend on the description of the
interconnect node and not whether the other is present. If we don't
vote through RPM, QoS parameters should be set regardless, as we're
requesting additional bandwidth by setting the interconnect clock
rates.

With NoC (the old-SoC bus type), this is not the case and they are
mutually exclusive (so, the current upstream logic is correct).

For BIMC however, newer SoCs expect QoS params to be always set
(like QNoC) whereas older ones (like MSM8998) hang up completely when
doing so, hence this will be addressed in the next commit.

The Fixes tag references the commit in which this logic was added, it
has since been shuffled around to a different file, but it's the one
where it originates from.

Fixes: f80a1d414328 ("interconnect: qcom: Add SDM660 interconnect provider driver")
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/interconnect/qcom/icc-rpm.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
index 385a67c20956..b1337f90c975 100644
--- a/drivers/interconnect/qcom/icc-rpm.c
+++ b/drivers/interconnect/qcom/icc-rpm.c
@@ -239,15 +239,27 @@ static int qcom_icc_rpm_set(int mas_rpm_id, int slv_rpm_id, u64 sum_bw)
 static int __qcom_icc_set(struct icc_node *n, struct qcom_icc_node *qn,
 			  u64 sum_bw)
 {
+	struct qcom_icc_provider *qp = to_qcom_provider(n->provider);
+	bool vote_ap, vote_rpm;
 	int ret;
 
-	if (!qn->qos.ap_owned) {
-		/* send bandwidth request message to the RPM processor */
+	if (qp->type == QCOM_ICC_QNOC) {
+		vote_ap = true;
+		vote_rpm = true;
+	} else {
+		vote_ap = qn->qos.ap_owned;
+		vote_rpm = !vote_ap;
+	}
+
+	if (vote_rpm) {
+		/* Send bandwidth request message to the RPM processor */
 		ret = qcom_icc_rpm_set(qn->mas_rpm_id, qn->slv_rpm_id, sum_bw);
 		if (ret)
 			return ret;
-	} else if (qn->qos.qos_mode != -1) {
-		/* set bandwidth directly from the AP */
+	}
+
+	if (vote_ap && qn->qos.qos_mode != NOC_QOS_MODE_INVALID) {
+		/* Set QoS params from the AP */
 		ret = qcom_icc_qos_set(n, sum_bw);
 		if (ret)
 			return ret;
-- 
2.39.0