[PATCH v4 4/5] memory: tegra186: Support icc scaling

Aaron Kling via B4 Relay
2025-10-27T18:55:16Z

From: Aaron Kling <webgeek1234@gmail.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@gmail.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,
};

--
2.51.0