linux-kernel - [PATCH v7 1/9] interconnect: qcom: rpm: make QoS INVALID default

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Date:   Wed, 08 Mar 2023 22:40:07 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Georgi Djakov <djakov@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH v7 1/9] interconnect: qcom: rpm: make QoS INVALID default

Currently NOC_QOS_MODE_FIXED is defined as 0x0 which makes it the
default option (partial struct initialization). The default option
however should be NOC_QOS_MODE_INVALID.

That results in bogus QoS configurations being sent for port 0 (which
is used for the DRAM endpoint on BIMC, for example) coming from all nodes
with .qos.ap_owned = true and uninitialized .qos.qos_mode. It's also an
issue for newer SoCs where all nodes are treated as if they were ap_owned,
but not all of them have QoS configuration.

The NOC_QOS_MODEs are defined as preprocessor constants and are not used
anywhere outside qcom_icc_set_noc_qos(), which is easily worked around.
Separate the desc->type values from the values sent to msmbus in the
aforementioned function. Make the former an enum for better mainainability.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/interconnect/qcom/icc-rpm.c | 24 +++++++++++++-----------
 drivers/interconnect/qcom/icc-rpm.h | 10 ++++++----
 2 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
index 4d0997b210f7..35fd75ae70e3 100644
--- a/drivers/interconnect/qcom/icc-rpm.c
+++ b/drivers/interconnect/qcom/icc-rpm.c
@@ -48,6 +48,9 @@
 #define NOC_QOS_MODEn_ADDR(n)		(0xc + (n * 0x1000))
 #define NOC_QOS_MODEn_MASK		0x3
 
+#define NOC_QOS_MODE_FIXED_VAL		0x0
+#define NOC_QOS_MODE_BYPASS_VAL		0x2
+
 static int qcom_icc_set_qnoc_qos(struct icc_node *src, u64 max_bw)
 {
 	struct icc_provider *provider = src->provider;
@@ -153,7 +156,7 @@ static int qcom_icc_set_noc_qos(struct icc_node *src, u64 max_bw)
 	struct qcom_icc_provider *qp;
 	struct qcom_icc_node *qn;
 	struct icc_provider *provider;
-	u32 mode = NOC_QOS_MODE_BYPASS;
+	u32 mode = NOC_QOS_MODE_BYPASS_VAL;
 	int rc = 0;
 
 	qn = src->data;
@@ -167,18 +170,17 @@ static int qcom_icc_set_noc_qos(struct icc_node *src, u64 max_bw)
 		return 0;
 	}
 
-	if (qn->qos.qos_mode != NOC_QOS_MODE_INVALID)
-		mode = qn->qos.qos_mode;
-
-	if (mode == NOC_QOS_MODE_FIXED) {
-		dev_dbg(src->provider->dev, "NoC QoS: %s: Set Fixed mode\n",
-			qn->name);
+	if (qn->qos.qos_mode == NOC_QOS_MODE_FIXED) {
+		dev_dbg(src->provider->dev, "NoC QoS: %s: Set Fixed mode\n", qn->name);
+		mode = NOC_QOS_MODE_FIXED_VAL;
 		rc = qcom_icc_noc_set_qos_priority(qp, &qn->qos);
 		if (rc)
 			return rc;
-	} else if (mode == NOC_QOS_MODE_BYPASS) {
-		dev_dbg(src->provider->dev, "NoC QoS: %s: Set Bypass mode\n",
-			qn->name);
+	} else if (qn->qos.qos_mode == NOC_QOS_MODE_BYPASS) {
+		dev_dbg(src->provider->dev, "NoC QoS: %s: Set Bypass mode\n", qn->name);
+		mode = NOC_QOS_MODE_BYPASS_VAL;
+	} else {
+		/* How did we get here? */
 	}
 
 	return regmap_update_bits(qp->regmap,
@@ -244,7 +246,7 @@ static int __qcom_icc_set(struct icc_node *n, struct qcom_icc_node *qn,
 		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) {
+	} else if (qn->qos.qos_mode != NOC_QOS_MODE_INVALID) {
 		/* set bandwidth directly from the AP */
 		ret = qcom_icc_qos_set(n, sum_bw);
 		if (ret)
diff --git a/drivers/interconnect/qcom/icc-rpm.h b/drivers/interconnect/qcom/icc-rpm.h
index a49af844ab13..8ba1918d7997 100644
--- a/drivers/interconnect/qcom/icc-rpm.h
+++ b/drivers/interconnect/qcom/icc-rpm.h
@@ -97,10 +97,12 @@ struct qcom_icc_desc {
 	unsigned int qos_offset;
 };
 
-/* Valid for both NoC and BIMC */
-#define NOC_QOS_MODE_INVALID		-1
-#define NOC_QOS_MODE_FIXED		0x0
-#define NOC_QOS_MODE_BYPASS		0x2
+/* Valid for all bus types */
+enum qos_mode {
+	NOC_QOS_MODE_INVALID = 0,
+	NOC_QOS_MODE_FIXED,
+	NOC_QOS_MODE_BYPASS,
+};
 
 int qnoc_probe(struct platform_device *pdev);
 int qnoc_remove(struct platform_device *pdev);

-- 
2.39.2