Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Konrad Dybcio <konrad.dybcio@linaro.org>
To:     linux-arm-msm@vger.kernel.org, andersson@kernel.org,
        agross@kernel.org, krzysztof.kozlowski@linaro.org
Cc:     marijn.suijten@somainline.org, bryan.odonoghue@linaro.org,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Georgi Djakov <djakov@kernel.org>, linux-pm@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH v2 01/10] interconnect: qcom: rpm: Don't set QoS params before non-zero bw is requested
Date:   Tue, 10 Jan 2023 14:21:53 +0100
Message-Id: <20230110132202.956619-2-konrad.dybcio@linaro.org>
In-Reply-To: <20230110132202.956619-1-konrad.dybcio@linaro.org>
References: <20230110132202.956619-1-konrad.dybcio@linaro.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Until now, the icc-rpm driver unconditionally set QoS params, even on
empty requests. This is superfluous and the downstream counterpart does
not do it. Follow it by doing the same.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 drivers/interconnect/qcom/icc-rpm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
index df3196f72536..361dcbf3386f 100644
--- a/drivers/interconnect/qcom/icc-rpm.c
+++ b/drivers/interconnect/qcom/icc-rpm.c
@@ -191,6 +191,12 @@ static int qcom_icc_qos_set(struct icc_node *node, u64 sum_bw)
 	struct qcom_icc_provider *qp = to_qcom_provider(node->provider);
 	struct qcom_icc_node *qn = node->data;
 
+	/* Defer setting QoS until the first non-zero bandwidth request. */
+	if (!(node->avg_bw || node->peak_bw)) {
+		dev_dbg(node->provider->dev, "NOT Setting QoS for %s\n", qn->name);
+		return 0;
+	}
+
 	dev_dbg(node->provider->dev, "Setting QoS for %s\n", qn->name);
 
 	switch (qp->type) {
-- 
2.39.0