From 6643b532b3c3412a2e2c351aed100ab4fb31884c Mon Sep 17 00:00:00 2001
From: Konrad Dybcio <konrad.dybcio@linaro.org>
Date: Fri, 7 Apr 2023 22:14:43 +0200
Subject: [PATCH 1/9] interconnect: qcom: rpm: Rename icc desc clocks to
 bus_blocks

Rename the "clocks" (and _names) fields of qcom_icc_desc to
"bus_clocks" in preparation for introducing handling of clocks that
need to be enabled but not voted on with aggregate frequency.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230228-topic-qos-v8-1-ee696a2c15a9@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>
---
 drivers/interconnect/qcom/icc-rpm.c |  6 +++---
 drivers/interconnect/qcom/icc-rpm.h |  4 ++--
 drivers/interconnect/qcom/msm8996.c | 12 ++++++------
 drivers/interconnect/qcom/sdm660.c  |  8 ++++----
 4 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
index 5341fa169dbf..ee3d09a6850e 100644
--- a/drivers/interconnect/qcom/icc-rpm.c
+++ b/drivers/interconnect/qcom/icc-rpm.c
@@ -440,9 +440,9 @@ int qnoc_probe(struct platform_device *pdev)
 	qnodes = desc->nodes;
 	num_nodes = desc->num_nodes;
 
-	if (desc->num_clocks) {
-		cds = desc->clocks;
-		cd_num = desc->num_clocks;
+	if (desc->num_bus_clocks) {
+		cds = desc->bus_clocks;
+		cd_num = desc->num_bus_clocks;
 	} else {
 		cds = bus_clocks;
 		cd_num = ARRAY_SIZE(bus_clocks);
diff --git a/drivers/interconnect/qcom/icc-rpm.h b/drivers/interconnect/qcom/icc-rpm.h
index 22bdb1e4bb12..689300a2fd4e 100644
--- a/drivers/interconnect/qcom/icc-rpm.h
+++ b/drivers/interconnect/qcom/icc-rpm.h
@@ -91,8 +91,8 @@ struct qcom_icc_node {
 struct qcom_icc_desc {
 	struct qcom_icc_node * const *nodes;
 	size_t num_nodes;
-	const char * const *clocks;
-	size_t num_clocks;
+	const char * const *bus_clocks;
+	size_t num_bus_clocks;
 	enum qcom_icc_type type;
 	const struct regmap_config *regmap_cfg;
 	unsigned int qos_offset;
diff --git a/drivers/interconnect/qcom/msm8996.c b/drivers/interconnect/qcom/msm8996.c
index 14efd2761b7a..21f998cd19f0 100644
--- a/drivers/interconnect/qcom/msm8996.c
+++ b/drivers/interconnect/qcom/msm8996.c
@@ -1821,8 +1821,8 @@ static const struct qcom_icc_desc msm8996_a0noc = {
 	.type = QCOM_ICC_NOC,
 	.nodes = a0noc_nodes,
 	.num_nodes = ARRAY_SIZE(a0noc_nodes),
-	.clocks = bus_a0noc_clocks,
-	.num_clocks = ARRAY_SIZE(bus_a0noc_clocks),
+	.bus_clocks = bus_a0noc_clocks,
+	.num_bus_clocks = ARRAY_SIZE(bus_a0noc_clocks),
 	.regmap_cfg = &msm8996_a0noc_regmap_config
 };
 
@@ -1865,8 +1865,8 @@ static const struct qcom_icc_desc msm8996_a2noc = {
 	.type = QCOM_ICC_NOC,
 	.nodes = a2noc_nodes,
 	.num_nodes = ARRAY_SIZE(a2noc_nodes),
-	.clocks = bus_a2noc_clocks,
-	.num_clocks = ARRAY_SIZE(bus_a2noc_clocks),
+	.bus_clocks = bus_a2noc_clocks,
+	.num_bus_clocks = ARRAY_SIZE(bus_a2noc_clocks),
 	.regmap_cfg = &msm8996_a2noc_regmap_config
 };
 
@@ -2004,8 +2004,8 @@ static const struct qcom_icc_desc msm8996_mnoc = {
 	.type = QCOM_ICC_NOC,
 	.nodes = mnoc_nodes,
 	.num_nodes = ARRAY_SIZE(mnoc_nodes),
-	.clocks = bus_mm_clocks,
-	.num_clocks = ARRAY_SIZE(bus_mm_clocks),
+	.bus_clocks = bus_mm_clocks,
+	.num_bus_clocks = ARRAY_SIZE(bus_mm_clocks),
 	.regmap_cfg = &msm8996_mnoc_regmap_config
 };
 
diff --git a/drivers/interconnect/qcom/sdm660.c b/drivers/interconnect/qcom/sdm660.c
index 8d879b0bcabc..a22ba821efbf 100644
--- a/drivers/interconnect/qcom/sdm660.c
+++ b/drivers/interconnect/qcom/sdm660.c
@@ -1516,8 +1516,8 @@ static const struct qcom_icc_desc sdm660_a2noc = {
 	.type = QCOM_ICC_NOC,
 	.nodes = sdm660_a2noc_nodes,
 	.num_nodes = ARRAY_SIZE(sdm660_a2noc_nodes),
-	.clocks = bus_a2noc_clocks,
-	.num_clocks = ARRAY_SIZE(bus_a2noc_clocks),
+	.bus_clocks = bus_a2noc_clocks,
+	.num_bus_clocks = ARRAY_SIZE(bus_a2noc_clocks),
 	.regmap_cfg = &sdm660_a2noc_regmap_config,
 };
 
@@ -1659,8 +1659,8 @@ static const struct qcom_icc_desc sdm660_mnoc = {
 	.type = QCOM_ICC_NOC,
 	.nodes = sdm660_mnoc_nodes,
 	.num_nodes = ARRAY_SIZE(sdm660_mnoc_nodes),
-	.clocks = bus_mm_clocks,
-	.num_clocks = ARRAY_SIZE(bus_mm_clocks),
+	.bus_clocks = bus_mm_clocks,
+	.num_bus_clocks = ARRAY_SIZE(bus_mm_clocks),
 	.regmap_cfg = &sdm660_mnoc_regmap_config,
 };
 

From 1a12928e25627e02126ad2d1c12cfdba79d6bd94 Mon Sep 17 00:00:00 2001
From: Konrad Dybcio <konrad.dybcio@linaro.org>
Date: Fri, 7 Apr 2023 22:14:44 +0200
Subject: [PATCH 2/9] interconnect: qcom: rpm: Rename icc provider num_clocks
 to num_bus_clocks

In preparation for handling non-scaling clocks that we still have to
enable, rename num_clocks to more descriptive num_bus_clocks.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230228-topic-qos-v8-2-ee696a2c15a9@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>
---
 drivers/interconnect/qcom/icc-rpm.c | 12 ++++++------
 drivers/interconnect/qcom/icc-rpm.h |  4 ++--
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
index ee3d09a6850e..8dce3dcff8da 100644
--- a/drivers/interconnect/qcom/icc-rpm.c
+++ b/drivers/interconnect/qcom/icc-rpm.c
@@ -379,7 +379,7 @@ static int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
 			return ret;
 	}
 
-	for (i = 0; i < qp->num_clks; i++) {
+	for (i = 0; i < qp->num_bus_clks; i++) {
 		/*
 		 * Use WAKE bucket for active clock, otherwise, use SLEEP bucket
 		 * for other clocks.  If a platform doesn't set interconnect
@@ -464,7 +464,7 @@ int qnoc_probe(struct platform_device *pdev)
 
 	for (i = 0; i < cd_num; i++)
 		qp->bus_clks[i].id = cds[i];
-	qp->num_clks = cd_num;
+	qp->num_bus_clks = cd_num;
 
 	qp->type = desc->type;
 	qp->qos_offset = desc->qos_offset;
@@ -494,11 +494,11 @@ int qnoc_probe(struct platform_device *pdev)
 	}
 
 regmap_done:
-	ret = devm_clk_bulk_get_optional(dev, qp->num_clks, qp->bus_clks);
+	ret = devm_clk_bulk_get_optional(dev, qp->num_bus_clks, qp->bus_clks);
 	if (ret)
 		return ret;
 
-	ret = clk_bulk_prepare_enable(qp->num_clks, qp->bus_clks);
+	ret = clk_bulk_prepare_enable(qp->num_bus_clks, qp->bus_clks);
 	if (ret)
 		return ret;
 
@@ -551,7 +551,7 @@ int qnoc_probe(struct platform_device *pdev)
 	icc_provider_deregister(provider);
 err_remove_nodes:
 	icc_nodes_remove(provider);
-	clk_bulk_disable_unprepare(qp->num_clks, qp->bus_clks);
+	clk_bulk_disable_unprepare(qp->num_bus_clks, qp->bus_clks);
 
 	return ret;
 }
@@ -563,7 +563,7 @@ int qnoc_remove(struct platform_device *pdev)
 
 	icc_provider_deregister(&qp->provider);
 	icc_nodes_remove(&qp->provider);
-	clk_bulk_disable_unprepare(qp->num_clks, qp->bus_clks);
+	clk_bulk_disable_unprepare(qp->num_bus_clks, qp->bus_clks);
 
 	return 0;
 }
diff --git a/drivers/interconnect/qcom/icc-rpm.h b/drivers/interconnect/qcom/icc-rpm.h
index 689300a2fd4e..2436777820a4 100644
--- a/drivers/interconnect/qcom/icc-rpm.h
+++ b/drivers/interconnect/qcom/icc-rpm.h
@@ -23,7 +23,7 @@ enum qcom_icc_type {
 /**
  * struct qcom_icc_provider - Qualcomm specific interconnect provider
  * @provider: generic interconnect provider
- * @num_clks: the total number of clk_bulk_data entries
+ * @num_bus_clks: the total number of bus_clks clk_bulk_data entries
  * @type: the ICC provider type
  * @regmap: regmap for QoS registers read/write access
  * @qos_offset: offset to QoS registers
@@ -32,7 +32,7 @@ enum qcom_icc_type {
  */
 struct qcom_icc_provider {
 	struct icc_provider provider;
-	int num_clks;
+	int num_bus_clks;
 	enum qcom_icc_type type;
 	struct regmap *regmap;
 	unsigned int qos_offset;

From ca545907c712f0045468ae66e1bf52dc69922ebe Mon Sep 17 00:00:00 2001
From: Konrad Dybcio <konrad.dybcio@linaro.org>
Date: Fri, 7 Apr 2023 22:14:45 +0200
Subject: [PATCH 3/9] interconnect: qcom: rpm: Drop unused parameters

The QoS-setting functions do not care about the bandwidth values passed.
Drop them.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230228-topic-qos-v8-3-ee696a2c15a9@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>
---
 drivers/interconnect/qcom/icc-rpm.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
index 8dce3dcff8da..7d62c0bf2722 100644
--- a/drivers/interconnect/qcom/icc-rpm.c
+++ b/drivers/interconnect/qcom/icc-rpm.c
@@ -50,7 +50,7 @@
 #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)
+static int qcom_icc_set_qnoc_qos(struct icc_node *src)
 {
 	struct icc_provider *provider = src->provider;
 	struct qcom_icc_provider *qp = to_qcom_provider(provider);
@@ -95,7 +95,7 @@ static int qcom_icc_bimc_set_qos_health(struct qcom_icc_provider *qp,
 				  mask, val);
 }
 
-static int qcom_icc_set_bimc_qos(struct icc_node *src, u64 max_bw)
+static int qcom_icc_set_bimc_qos(struct icc_node *src)
 {
 	struct qcom_icc_provider *qp;
 	struct qcom_icc_node *qn;
@@ -150,7 +150,7 @@ static int qcom_icc_noc_set_qos_priority(struct qcom_icc_provider *qp,
 				  NOC_QOS_PRIORITY_P0_MASK, qos->prio_level);
 }
 
-static int qcom_icc_set_noc_qos(struct icc_node *src, u64 max_bw)
+static int qcom_icc_set_noc_qos(struct icc_node *src)
 {
 	struct qcom_icc_provider *qp;
 	struct qcom_icc_node *qn;
@@ -187,7 +187,7 @@ static int qcom_icc_set_noc_qos(struct icc_node *src, u64 max_bw)
 				  NOC_QOS_MODEn_MASK, mode);
 }
 
-static int qcom_icc_qos_set(struct icc_node *node, u64 sum_bw)
+static int qcom_icc_qos_set(struct icc_node *node)
 {
 	struct qcom_icc_provider *qp = to_qcom_provider(node->provider);
 	struct qcom_icc_node *qn = node->data;
@@ -196,11 +196,11 @@ static int qcom_icc_qos_set(struct icc_node *node, u64 sum_bw)
 
 	switch (qp->type) {
 	case QCOM_ICC_BIMC:
-		return qcom_icc_set_bimc_qos(node, sum_bw);
+		return qcom_icc_set_bimc_qos(node);
 	case QCOM_ICC_QNOC:
-		return qcom_icc_set_qnoc_qos(node, sum_bw);
+		return qcom_icc_set_qnoc_qos(node);
 	default:
-		return qcom_icc_set_noc_qos(node, sum_bw);
+		return qcom_icc_set_noc_qos(node);
 	}
 }
 

From 32882f657e7811abb6a883653b68dce0539a693e Mon Sep 17 00:00:00 2001
From: Konrad Dybcio <konrad.dybcio@linaro.org>
Date: Fri, 7 Apr 2023 22:14:46 +0200
Subject: [PATCH 4/9] interconnect: qcom: rpm: Set QoS registers only once

The QoS registers are (or according to Qualcomm folks, on most
platforms) persistent until a full chip reboot. Move the QoS-setting
functions to the probe function so that we don't needlessly do it over
and over again.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230228-topic-qos-v8-4-ee696a2c15a9@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>
---
 drivers/interconnect/qcom/icc-rpm.c | 50 ++++++++++++-----------------
 1 file changed, 21 insertions(+), 29 deletions(-)

diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
index 7d62c0bf2722..d79e508cb717 100644
--- a/drivers/interconnect/qcom/icc-rpm.c
+++ b/drivers/interconnect/qcom/icc-rpm.c
@@ -204,30 +204,33 @@ static int qcom_icc_qos_set(struct icc_node *node)
 	}
 }
 
-static int qcom_icc_rpm_set(int mas_rpm_id, int slv_rpm_id, u64 sum_bw)
+static int qcom_icc_rpm_set(struct qcom_icc_node *qn, u64 sum_bw)
 {
 	int ret = 0;
 
-	if (mas_rpm_id != -1) {
+	if (qn->qos.ap_owned)
+		return 0;
+
+	if (qn->mas_rpm_id != -1) {
 		ret = qcom_icc_rpm_smd_send(QCOM_SMD_RPM_ACTIVE_STATE,
 					    RPM_BUS_MASTER_REQ,
-					    mas_rpm_id,
+					    qn->mas_rpm_id,
 					    sum_bw);
 		if (ret) {
 			pr_err("qcom_icc_rpm_smd_send mas %d error %d\n",
-			       mas_rpm_id, ret);
+			       qn->mas_rpm_id, ret);
 			return ret;
 		}
 	}
 
-	if (slv_rpm_id != -1) {
+	if (qn->slv_rpm_id != -1) {
 		ret = qcom_icc_rpm_smd_send(QCOM_SMD_RPM_ACTIVE_STATE,
 					    RPM_BUS_SLAVE_REQ,
-					    slv_rpm_id,
+					    qn->slv_rpm_id,
 					    sum_bw);
 		if (ret) {
 			pr_err("qcom_icc_rpm_smd_send slv %d error %d\n",
-			       slv_rpm_id, ret);
+			       qn->slv_rpm_id, ret);
 			return ret;
 		}
 	}
@@ -235,26 +238,6 @@ static int qcom_icc_rpm_set(int mas_rpm_id, int slv_rpm_id, u64 sum_bw)
 	return ret;
 }
 
-static int __qcom_icc_set(struct icc_node *n, struct qcom_icc_node *qn,
-			  u64 sum_bw)
-{
-	int ret;
-
-	if (!qn->qos.ap_owned) {
-		/* 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 != NOC_QOS_MODE_INVALID) {
-		/* set bandwidth directly from the AP */
-		ret = qcom_icc_qos_set(n, sum_bw);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
 /**
  * qcom_icc_pre_bw_aggregate - cleans up values before re-aggregate requests
  * @node: icc node to operate on
@@ -370,11 +353,12 @@ static int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
 
 	sum_bw = icc_units_to_bps(max_agg_avg);
 
-	ret = __qcom_icc_set(src, src_qn, sum_bw);
+	ret = qcom_icc_rpm_set(src_qn, sum_bw);
 	if (ret)
 		return ret;
+
 	if (dst_qn) {
-		ret = __qcom_icc_set(dst, dst_qn, sum_bw);
+		ret = qcom_icc_rpm_set(dst_qn, sum_bw);
 		if (ret)
 			return ret;
 	}
@@ -528,6 +512,14 @@ int qnoc_probe(struct platform_device *pdev)
 		for (j = 0; j < qnodes[i]->num_links; j++)
 			icc_link_create(node, qnodes[i]->links[j]);
 
+		/* Set QoS registers (we only need to do it once, generally) */
+		if (qnodes[i]->qos.ap_owned &&
+		    qnodes[i]->qos.qos_mode != NOC_QOS_MODE_INVALID) {
+			ret = qcom_icc_qos_set(node);
+			if (ret)
+				return ret;
+		}
+
 		data->nodes[i] = node;
 	}
 	data->num_nodes = num_nodes;

From 2e2113c8a64f2668baca28a82144a4f0dc22a217 Mon Sep 17 00:00:00 2001
From: Konrad Dybcio <konrad.dybcio@linaro.org>
Date: Thu, 18 May 2023 21:58:01 +0200
Subject: [PATCH 5/9] interconnect: qcom: rpm: Handle interface clocks

Some (but not all) providers (or their specific nodes) require
specific clocks to be turned on before they can be accessed. Failure
to ensure that results in a seemingly random system crash (which
would usually happen at boot with the interconnect driver built-in),
resulting in the platform not booting up properly.

Limit the number of bus_clocks to 2 (which is the maximum that SMD
RPM interconnect supports anyway) and handle non-scaling clocks
separately. Update MSM8996 and SDM660 drivers to make sure they do
not regress with this change.

This unfortunately has to be done in one patch to prevent either
compile errors or broken bisect.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230518195801.2556998-1-konrad.dybcio@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>
---
 drivers/interconnect/qcom/icc-rpm.c | 52 ++++++++++++++++++++---------
 drivers/interconnect/qcom/icc-rpm.h | 14 ++++++--
 drivers/interconnect/qcom/msm8996.c | 22 +++++-------
 drivers/interconnect/qcom/sdm660.c  | 16 ++++-----
 4 files changed, 64 insertions(+), 40 deletions(-)

diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
index d79e508cb717..c34f75703a66 100644
--- a/drivers/interconnect/qcom/icc-rpm.c
+++ b/drivers/interconnect/qcom/icc-rpm.c
@@ -409,7 +409,7 @@ int qnoc_probe(struct platform_device *pdev)
 	struct qcom_icc_provider *qp;
 	struct icc_node *node;
 	size_t num_nodes, i;
-	const char * const *cds;
+	const char * const *cds = NULL;
 	int cd_num;
 	int ret;
 
@@ -424,6 +424,31 @@ int qnoc_probe(struct platform_device *pdev)
 	qnodes = desc->nodes;
 	num_nodes = desc->num_nodes;
 
+	if (desc->num_intf_clocks) {
+		cds = desc->intf_clocks;
+		cd_num = desc->num_intf_clocks;
+	} else {
+		/* 0 intf clocks is perfectly fine */
+		cd_num = 0;
+	}
+
+	qp = devm_kzalloc(dev, sizeof(*qp), GFP_KERNEL);
+	if (!qp)
+		return -ENOMEM;
+
+	qp->intf_clks = devm_kzalloc(dev, sizeof(qp->intf_clks), GFP_KERNEL);
+	if (!qp->intf_clks)
+		return -ENOMEM;
+
+	data = devm_kzalloc(dev, struct_size(data, nodes, num_nodes),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	qp->num_intf_clks = cd_num;
+	for (i = 0; i < cd_num; i++)
+		qp->intf_clks[i].id = cds[i];
+
 	if (desc->num_bus_clocks) {
 		cds = desc->bus_clocks;
 		cd_num = desc->num_bus_clocks;
@@ -432,20 +457,6 @@ int qnoc_probe(struct platform_device *pdev)
 		cd_num = ARRAY_SIZE(bus_clocks);
 	}
 
-	qp = devm_kzalloc(dev, struct_size(qp, bus_clks, cd_num), GFP_KERNEL);
-	if (!qp)
-		return -ENOMEM;
-
-	qp->bus_clk_rate = devm_kcalloc(dev, cd_num, sizeof(*qp->bus_clk_rate),
-					GFP_KERNEL);
-	if (!qp->bus_clk_rate)
-		return -ENOMEM;
-
-	data = devm_kzalloc(dev, struct_size(data, nodes, num_nodes),
-			    GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
-
 	for (i = 0; i < cd_num; i++)
 		qp->bus_clks[i].id = cds[i];
 	qp->num_bus_clks = cd_num;
@@ -486,6 +497,10 @@ int qnoc_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	ret = devm_clk_bulk_get(dev, qp->num_intf_clks, qp->intf_clks);
+	if (ret)
+		return ret;
+
 	provider = &qp->provider;
 	provider->dev = dev;
 	provider->set = qcom_icc_set;
@@ -496,6 +511,11 @@ int qnoc_probe(struct platform_device *pdev)
 
 	icc_provider_init(provider);
 
+	/* If this fails, bus accesses will crash the platform! */
+	ret = clk_bulk_prepare_enable(qp->num_intf_clks, qp->intf_clks);
+	if (ret)
+		return ret;
+
 	for (i = 0; i < num_nodes; i++) {
 		size_t j;
 
@@ -524,6 +544,8 @@ int qnoc_probe(struct platform_device *pdev)
 	}
 	data->num_nodes = num_nodes;
 
+	clk_bulk_disable_unprepare(qp->num_intf_clks, qp->intf_clks);
+
 	ret = icc_provider_register(provider);
 	if (ret)
 		goto err_remove_nodes;
diff --git a/drivers/interconnect/qcom/icc-rpm.h b/drivers/interconnect/qcom/icc-rpm.h
index 2436777820a4..b9b63860042f 100644
--- a/drivers/interconnect/qcom/icc-rpm.h
+++ b/drivers/interconnect/qcom/icc-rpm.h
@@ -20,24 +20,32 @@ enum qcom_icc_type {
 	QCOM_ICC_QNOC,
 };
 
+#define NUM_BUS_CLKS	2
+
 /**
  * struct qcom_icc_provider - Qualcomm specific interconnect provider
  * @provider: generic interconnect provider
  * @num_bus_clks: the total number of bus_clks clk_bulk_data entries
+ * @num_intf_clks: the total number of intf_clks clk_bulk_data entries
  * @type: the ICC provider type
  * @regmap: regmap for QoS registers read/write access
  * @qos_offset: offset to QoS registers
  * @bus_clk_rate: bus clock rate in Hz
  * @bus_clks: the clk_bulk_data table of bus clocks
+ * @intf_clks: a clk_bulk_data array of interface clocks
+ * @is_on: whether the bus is powered on
  */
 struct qcom_icc_provider {
 	struct icc_provider provider;
 	int num_bus_clks;
+	int num_intf_clks;
 	enum qcom_icc_type type;
 	struct regmap *regmap;
 	unsigned int qos_offset;
-	u64 *bus_clk_rate;
-	struct clk_bulk_data bus_clks[];
+	u64 bus_clk_rate[NUM_BUS_CLKS];
+	struct clk_bulk_data bus_clks[NUM_BUS_CLKS];
+	struct clk_bulk_data *intf_clks;
+	bool is_on;
 };
 
 /**
@@ -93,6 +101,8 @@ struct qcom_icc_desc {
 	size_t num_nodes;
 	const char * const *bus_clocks;
 	size_t num_bus_clocks;
+	const char * const *intf_clocks;
+	size_t num_intf_clocks;
 	enum qcom_icc_type type;
 	const struct regmap_config *regmap_cfg;
 	unsigned int qos_offset;
diff --git a/drivers/interconnect/qcom/msm8996.c b/drivers/interconnect/qcom/msm8996.c
index 21f998cd19f0..9aedfc8de4bf 100644
--- a/drivers/interconnect/qcom/msm8996.c
+++ b/drivers/interconnect/qcom/msm8996.c
@@ -21,21 +21,17 @@
 #include "smd-rpm.h"
 #include "msm8996.h"
 
-static const char * const bus_mm_clocks[] = {
-	"bus",
-	"bus_a",
+static const char * const mm_intf_clocks[] = {
 	"iface"
 };
 
-static const char * const bus_a0noc_clocks[] = {
+static const char * const a0noc_intf_clocks[] = {
 	"aggre0_snoc_axi",
 	"aggre0_cnoc_ahb",
 	"aggre0_noc_mpu_cfg"
 };
 
-static const char * const bus_a2noc_clocks[] = {
-	"bus",
-	"bus_a",
+static const char * const a2noc_intf_clocks[] = {
 	"aggre2_ufs_axi",
 	"ufs_axi"
 };
@@ -1821,8 +1817,8 @@ static const struct qcom_icc_desc msm8996_a0noc = {
 	.type = QCOM_ICC_NOC,
 	.nodes = a0noc_nodes,
 	.num_nodes = ARRAY_SIZE(a0noc_nodes),
-	.bus_clocks = bus_a0noc_clocks,
-	.num_bus_clocks = ARRAY_SIZE(bus_a0noc_clocks),
+	.intf_clocks = a0noc_intf_clocks,
+	.num_intf_clocks = ARRAY_SIZE(a0noc_intf_clocks),
 	.regmap_cfg = &msm8996_a0noc_regmap_config
 };
 
@@ -1865,8 +1861,8 @@ static const struct qcom_icc_desc msm8996_a2noc = {
 	.type = QCOM_ICC_NOC,
 	.nodes = a2noc_nodes,
 	.num_nodes = ARRAY_SIZE(a2noc_nodes),
-	.bus_clocks = bus_a2noc_clocks,
-	.num_bus_clocks = ARRAY_SIZE(bus_a2noc_clocks),
+	.intf_clocks = a2noc_intf_clocks,
+	.num_intf_clocks = ARRAY_SIZE(a2noc_intf_clocks),
 	.regmap_cfg = &msm8996_a2noc_regmap_config
 };
 
@@ -2004,8 +2000,8 @@ static const struct qcom_icc_desc msm8996_mnoc = {
 	.type = QCOM_ICC_NOC,
 	.nodes = mnoc_nodes,
 	.num_nodes = ARRAY_SIZE(mnoc_nodes),
-	.bus_clocks = bus_mm_clocks,
-	.num_bus_clocks = ARRAY_SIZE(bus_mm_clocks),
+	.intf_clocks = mm_intf_clocks,
+	.num_intf_clocks = ARRAY_SIZE(mm_intf_clocks),
 	.regmap_cfg = &msm8996_mnoc_regmap_config
 };
 
diff --git a/drivers/interconnect/qcom/sdm660.c b/drivers/interconnect/qcom/sdm660.c
index a22ba821efbf..0e8a96f4ce90 100644
--- a/drivers/interconnect/qcom/sdm660.c
+++ b/drivers/interconnect/qcom/sdm660.c
@@ -127,15 +127,11 @@ enum {
 	SDM660_SNOC,
 };
 
-static const char * const bus_mm_clocks[] = {
-	"bus",
-	"bus_a",
+static const char * const mm_intf_clocks[] = {
 	"iface",
 };
 
-static const char * const bus_a2noc_clocks[] = {
-	"bus",
-	"bus_a",
+static const char * const a2noc_intf_clocks[] = {
 	"ipa",
 	"ufs_axi",
 	"aggre2_ufs_axi",
@@ -1516,8 +1512,8 @@ static const struct qcom_icc_desc sdm660_a2noc = {
 	.type = QCOM_ICC_NOC,
 	.nodes = sdm660_a2noc_nodes,
 	.num_nodes = ARRAY_SIZE(sdm660_a2noc_nodes),
-	.bus_clocks = bus_a2noc_clocks,
-	.num_bus_clocks = ARRAY_SIZE(bus_a2noc_clocks),
+	.intf_clocks = a2noc_intf_clocks,
+	.num_intf_clocks = ARRAY_SIZE(a2noc_intf_clocks),
 	.regmap_cfg = &sdm660_a2noc_regmap_config,
 };
 
@@ -1659,8 +1655,8 @@ static const struct qcom_icc_desc sdm660_mnoc = {
 	.type = QCOM_ICC_NOC,
 	.nodes = sdm660_mnoc_nodes,
 	.num_nodes = ARRAY_SIZE(sdm660_mnoc_nodes),
-	.bus_clocks = bus_mm_clocks,
-	.num_bus_clocks = ARRAY_SIZE(bus_mm_clocks),
+	.intf_clocks = mm_intf_clocks,
+	.num_intf_clocks = ARRAY_SIZE(mm_intf_clocks),
 	.regmap_cfg = &sdm660_mnoc_regmap_config,
 };
 

From a867cf9b65eadc172bc73e56b13458742d4d050e Mon Sep 17 00:00:00 2001
From: Konrad Dybcio <konrad.dybcio@linaro.org>
Date: Fri, 7 Apr 2023 22:14:48 +0200
Subject: [PATCH 6/9] interconnect: qcom: icc-rpm: Enforce 2 or 0 bus clocks

For SMD RPM bus scaling to work, we need a pair of sleep-wake clocks.
The variable number of them we previously supported was only a hack
to keep the clocks required for QoS register access, but now that
these are separated, we can leave bus_clks to the actual bus clocks.

In cases where there is no actual bus scaling (such as A0NoC on MSM8996
and GNoC on SDM660 where the HLOS is only supposed to program the QoS
registers and the bus is either static or controlled remotely), allow
for no clock scaling with a boolean property.

Remove all the code related to allowing an arbitrary number of bus_clks,
replace the number by BUS_CLK_MAX (= 2) and guard the bus clock paths
to ensure they are not taken on non-scaling buses.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230228-topic-qos-v8-6-ee696a2c15a9@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>
---
 drivers/interconnect/qcom/icc-rpm.c | 14 +++-----------
 drivers/interconnect/qcom/icc-rpm.h |  4 ++--
 drivers/interconnect/qcom/msm8996.c |  1 +
 drivers/interconnect/qcom/sdm660.c  |  1 +
 4 files changed, 7 insertions(+), 13 deletions(-)

diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
index c34f75703a66..bebc7928af24 100644
--- a/drivers/interconnect/qcom/icc-rpm.c
+++ b/drivers/interconnect/qcom/icc-rpm.c
@@ -449,17 +449,9 @@ int qnoc_probe(struct platform_device *pdev)
 	for (i = 0; i < cd_num; i++)
 		qp->intf_clks[i].id = cds[i];
 
-	if (desc->num_bus_clocks) {
-		cds = desc->bus_clocks;
-		cd_num = desc->num_bus_clocks;
-	} else {
-		cds = bus_clocks;
-		cd_num = ARRAY_SIZE(bus_clocks);
-	}
-
-	for (i = 0; i < cd_num; i++)
-		qp->bus_clks[i].id = cds[i];
-	qp->num_bus_clks = cd_num;
+	qp->num_bus_clks = desc->no_clk_scaling ? 0 : NUM_BUS_CLKS;
+	for (i = 0; i < qp->num_bus_clks; i++)
+		qp->bus_clks[i].id = bus_clocks[i];
 
 	qp->type = desc->type;
 	qp->qos_offset = desc->qos_offset;
diff --git a/drivers/interconnect/qcom/icc-rpm.h b/drivers/interconnect/qcom/icc-rpm.h
index b9b63860042f..ee705edf19dd 100644
--- a/drivers/interconnect/qcom/icc-rpm.h
+++ b/drivers/interconnect/qcom/icc-rpm.h
@@ -25,7 +25,7 @@ enum qcom_icc_type {
 /**
  * struct qcom_icc_provider - Qualcomm specific interconnect provider
  * @provider: generic interconnect provider
- * @num_bus_clks: the total number of bus_clks clk_bulk_data entries
+ * @num_bus_clks: the total number of bus_clks clk_bulk_data entries (0 or 2)
  * @num_intf_clks: the total number of intf_clks clk_bulk_data entries
  * @type: the ICC provider type
  * @regmap: regmap for QoS registers read/write access
@@ -100,9 +100,9 @@ struct qcom_icc_desc {
 	struct qcom_icc_node * const *nodes;
 	size_t num_nodes;
 	const char * const *bus_clocks;
-	size_t num_bus_clocks;
 	const char * const *intf_clocks;
 	size_t num_intf_clocks;
+	bool no_clk_scaling;
 	enum qcom_icc_type type;
 	const struct regmap_config *regmap_cfg;
 	unsigned int qos_offset;
diff --git a/drivers/interconnect/qcom/msm8996.c b/drivers/interconnect/qcom/msm8996.c
index 9aedfc8de4bf..dc9959a87df2 100644
--- a/drivers/interconnect/qcom/msm8996.c
+++ b/drivers/interconnect/qcom/msm8996.c
@@ -1819,6 +1819,7 @@ static const struct qcom_icc_desc msm8996_a0noc = {
 	.num_nodes = ARRAY_SIZE(a0noc_nodes),
 	.intf_clocks = a0noc_intf_clocks,
 	.num_intf_clocks = ARRAY_SIZE(a0noc_intf_clocks),
+	.no_clk_scaling = true,
 	.regmap_cfg = &msm8996_a0noc_regmap_config
 };
 
diff --git a/drivers/interconnect/qcom/sdm660.c b/drivers/interconnect/qcom/sdm660.c
index 0e8a96f4ce90..7ffaf70d62d3 100644
--- a/drivers/interconnect/qcom/sdm660.c
+++ b/drivers/interconnect/qcom/sdm660.c
@@ -1616,6 +1616,7 @@ static const struct qcom_icc_desc sdm660_gnoc = {
 	.nodes = sdm660_gnoc_nodes,
 	.num_nodes = ARRAY_SIZE(sdm660_gnoc_nodes),
 	.regmap_cfg = &sdm660_gnoc_regmap_config,
+	.no_clk_scaling = true,
 };
 
 static struct qcom_icc_node * const sdm660_mnoc_nodes[] = {

From 1ff7aedcdcdd4fe02201269ab428b09491e5cf6e Mon Sep 17 00:00:00 2001
From: Konrad Dybcio <konrad.dybcio@linaro.org>
Date: Fri, 7 Apr 2023 22:14:49 +0200
Subject: [PATCH 7/9] interconnect: qcom: rpm: Don't use clk_get_optional for
 bus clocks anymore

Commit dd42ec8ea5b9 ("interconnect: qcom: rpm: Use _optional func for provider clocks")
relaxed the requirements around probing bus clocks. This was a decent
solution for making sure MSM8996 would still boot with old DTs, but
now that there's a proper fix in place that both old and new DTs
will be happy about, revert back to the safer variant of the
function.

Fixes: dd42ec8ea5b9 ("interconnect: qcom: rpm: Use _optional func for provider clocks")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230228-topic-qos-v8-7-ee696a2c15a9@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>
---
 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 bebc7928af24..f4627c4a1bdd 100644
--- a/drivers/interconnect/qcom/icc-rpm.c
+++ b/drivers/interconnect/qcom/icc-rpm.c
@@ -481,7 +481,7 @@ int qnoc_probe(struct platform_device *pdev)
 	}
 
 regmap_done:
-	ret = devm_clk_bulk_get_optional(dev, qp->num_bus_clks, qp->bus_clks);
+	ret = devm_clk_bulk_get(dev, qp->num_bus_clks, qp->bus_clks);
 	if (ret)
 		return ret;
 

From 130733a10079102a78b51bf19bf4e4fa4d119c67 Mon Sep 17 00:00:00 2001
From: Konrad Dybcio <konrad.dybcio@linaro.org>
Date: Fri, 7 Apr 2023 22:14:50 +0200
Subject: [PATCH 8/9] interconnect: qcom: msm8996: Promote to core_initcall

The interconnect driver is (or soon will be) vital to many other
devices, as it's not a given that the bootloader will set up enough
bandwidth for us or that the values we come into are reasonable.

Promote the driver to core_initcall to ensure the consumers (i.e.
most "meaningful" parts of the SoC) can probe without deferrals.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230228-topic-qos-v8-8-ee696a2c15a9@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>
---
 drivers/interconnect/qcom/msm8996.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/interconnect/qcom/msm8996.c b/drivers/interconnect/qcom/msm8996.c
index dc9959a87df2..20340fb62fe6 100644
--- a/drivers/interconnect/qcom/msm8996.c
+++ b/drivers/interconnect/qcom/msm8996.c
@@ -2108,7 +2108,17 @@ static struct platform_driver qnoc_driver = {
 		.sync_state = icc_sync_state,
 	}
 };
-module_platform_driver(qnoc_driver);
+static int __init qnoc_driver_init(void)
+{
+	return platform_driver_register(&qnoc_driver);
+}
+core_initcall(qnoc_driver_init);
+
+static void __exit qnoc_driver_exit(void)
+{
+	platform_driver_unregister(&qnoc_driver);
+}
+module_exit(qnoc_driver_exit);
 
 MODULE_AUTHOR("Yassine Oudjana <y.oudjana@protonmail.com>");
 MODULE_DESCRIPTION("Qualcomm MSM8996 NoC driver");

From 0ebee0a6f73e7169fb2ee59587aad2880438485a Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@linaro.org>
Date: Tue, 23 May 2023 13:27:28 +0300
Subject: [PATCH 9/9] interconnect: qcom: rpm: allocate enough data in probe()

This was not allocating enough bytes.  There are two issue here.
First, there was a typo where it was taking the size of the pointer
instead of the size of the struct, "sizeof(qp->intf_clks)" vs
"sizeof(*qp->intf_clks)".  Second, it's an array of "cd_num" clocks so
we need to allocate space for more than one element.

Fixes: 2e2113c8a64f ("interconnect: qcom: rpm: Handle interface clocks")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/e0fa275c-ae63-4342-9c9e-0ffaf6314da1@kili.mountain
Signed-off-by: Georgi Djakov <djakov@kernel.org>
---
 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 f4627c4a1bdd..6acc7686ed38 100644
--- a/drivers/interconnect/qcom/icc-rpm.c
+++ b/drivers/interconnect/qcom/icc-rpm.c
@@ -436,7 +436,7 @@ int qnoc_probe(struct platform_device *pdev)
 	if (!qp)
 		return -ENOMEM;
 
-	qp->intf_clks = devm_kzalloc(dev, sizeof(qp->intf_clks), GFP_KERNEL);
+	qp->intf_clks = devm_kcalloc(dev, cd_num, sizeof(*qp->intf_clks), GFP_KERNEL);
 	if (!qp->intf_clks)
 		return -ENOMEM;