linux-kernel - [PATCH 5/8] memory: tegra186: Support icc scaling

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Message-Id: <20250831-tegra186-icc-v1-5-607ddc53b507@gmail.com>
Date: Sun, 31 Aug 2025 22:33:53 -0500
From: Aaron Kling via B4 Relay <devnull+webgeek1234.gmail.com@...nel.org>
To: Krzysztof Kozlowski <krzk@...nel.org>, Rob Herring <robh@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Viresh Kumar <viresh.kumar@...aro.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org, 
 Aaron Kling <webgeek1234@...il.com>
Subject: [PATCH 5/8] memory: tegra186: Support icc scaling

From: Aaron Kling <webgeek1234@...il.com>

Add Interconnect framework support to dynamically set the DRAM
bandwidth from different clients. The MC driver is added as an ICC
provider and the EMC driver is already a provider.

Signed-off-by: Aaron Kling <webgeek1234@...il.com>
---
 drivers/memory/tegra/tegra186.c | 48 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/drivers/memory/tegra/tegra186.c b/drivers/memory/tegra/tegra186.c
index aee11457bf8e032637d1772affb87da0cac68494..1384164f624af5d4aaccedc84443d203ba3db2c6 100644
--- a/drivers/memory/tegra/tegra186.c
+++ b/drivers/memory/tegra/tegra186.c
@@ -899,9 +899,56 @@ static const struct tegra_mc_client tegra186_mc_clients[] = {
 				.security = 0x51c,
 			},
 		},
+	}, {
+		.id = TEGRA_ICC_MC_CPU_CLUSTER0,
+		.name = "sw_cluster0",
+		.type = TEGRA_ICC_NISO,
+	}, {
+		.id = TEGRA_ICC_MC_CPU_CLUSTER1,
+		.name = "sw_cluster1",
+		.type = TEGRA_ICC_NISO,
 	},
 };
 
+static int tegra186_mc_icc_set(struct icc_node *src, struct icc_node *dst)
+{
+	/* TODO: program PTSA */
+	return 0;
+}
+
+static int tegra186_mc_icc_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
+				     u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
+{
+	struct icc_provider *p = node->provider;
+	struct tegra_mc *mc = icc_provider_to_tegra_mc(p);
+
+	if (node->id == TEGRA_ICC_MC_CPU_CLUSTER0 ||
+	    node->id == TEGRA_ICC_MC_CPU_CLUSTER1) {
+		if (mc)
+			peak_bw = peak_bw * mc->num_channels;
+	}
+
+	*agg_avg += avg_bw;
+	*agg_peak = max(*agg_peak, peak_bw);
+
+	return 0;
+}
+
+static int tegra186_mc_icc_get_init_bw(struct icc_node *node, u32 *avg, u32 *peak)
+{
+	*avg = 0;
+	*peak = 0;
+
+	return 0;
+}
+
+static const struct tegra_mc_icc_ops tegra186_mc_icc_ops = {
+	.xlate = tegra_mc_icc_xlate,
+	.aggregate = tegra186_mc_icc_aggregate,
+	.get_bw = tegra186_mc_icc_get_init_bw,
+	.set = tegra186_mc_icc_set,
+};
+
 const struct tegra_mc_soc tegra186_mc_soc = {
 	.num_clients = ARRAY_SIZE(tegra186_mc_clients),
 	.clients = tegra186_mc_clients,
@@ -912,6 +959,7 @@ const struct tegra_mc_soc tegra186_mc_soc = {
 		   MC_INT_SECERR_SEC | MC_INT_DECERR_VPR |
 		   MC_INT_SECURITY_VIOLATION | MC_INT_DECERR_EMEM,
 	.ops = &tegra186_mc_ops,
+	.icc_ops = &tegra186_mc_icc_ops,
 	.ch_intmask = 0x0000000f,
 	.global_intstatus_channel_shift = 0,
 };

-- 
2.50.1