linux-kernel - [PATCH v1 2/2] interconnect: qcom: icc-rpm: Cache every clock rate

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Date:   Sat, 16 Apr 2022 11:10:29 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Georgi Djakov <djakov@...nel.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Leo Yan <leo.yan@...aro.org>
Subject: [PATCH v1 2/2] interconnect: qcom: icc-rpm: Cache every clock rate

The cached clock rate is used for all bus clocks, thus it has the
assumption that all interconnect clock rates are always same, this
causes trouble if we want to set different clock rates separately.

This patch is to allocate a clock rate array to cache every clock
rate.

Signed-off-by: Leo Yan <leo.yan@...aro.org>
---
 drivers/interconnect/qcom/icc-rpm.c | 14 +++++++++-----
 drivers/interconnect/qcom/icc-rpm.h |  2 +-
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
index e0309e246523..45d23aaeabf6 100644
--- a/drivers/interconnect/qcom/icc-rpm.c
+++ b/drivers/interconnect/qcom/icc-rpm.c
@@ -274,20 +274,19 @@ static int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
 	do_div(rate, qn->buswidth);
 	rate = min_t(u64, rate, LONG_MAX);
 
-	if (qp->bus_clk_rate == rate)
-		return 0;
-
 	for (i = 0; i < qp->num_clks; i++) {
+		if (qp->bus_clk_rate[i] == rate)
+			continue;
+
 		ret = clk_set_rate(qp->bus_clks[i].clk, rate);
 		if (ret) {
 			pr_err("%s clk_set_rate error: %d\n",
 			       qp->bus_clks[i].id, ret);
 			return ret;
 		}
+		qp->bus_clk_rate[i] = rate;
 	}
 
-	qp->bus_clk_rate = rate;
-
 	return 0;
 }
 
@@ -332,6 +331,11 @@ int qnoc_probe(struct platform_device *pdev)
 	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)
diff --git a/drivers/interconnect/qcom/icc-rpm.h b/drivers/interconnect/qcom/icc-rpm.h
index 4457fcc5b84c..f6c4ac960102 100644
--- a/drivers/interconnect/qcom/icc-rpm.h
+++ b/drivers/interconnect/qcom/icc-rpm.h
@@ -34,7 +34,7 @@ struct qcom_icc_provider {
 	enum qcom_icc_type type;
 	struct regmap *regmap;
 	unsigned int qos_offset;
-	u64 bus_clk_rate;
+	u64 *bus_clk_rate;
 	struct clk_bulk_data bus_clks[];
 };
 
-- 
2.25.1