1 files changed, 71 insertions, 65 deletions

diff --git a/drivers/memory/tegra/tegra186-emc.c b/drivers/memory/tegra/tegra186-emc.c
index 6ad8a4023dd7..4007f4e16d74 100644
--- a/drivers/memory/tegra/tegra186-emc.c
+++ b/drivers/memory/tegra/tegra186-emc.c
@@ -155,6 +155,73 @@ DEFINE_DEBUGFS_ATTRIBUTE(tegra186_emc_debug_max_rate_fops,
 			  tegra186_emc_debug_max_rate_get,
 			  tegra186_emc_debug_max_rate_set, "%llu\n");
 
+static int tegra186_emc_get_emc_dvfs_latency(struct tegra186_emc *emc)
+{
+	struct mrq_emc_dvfs_latency_response response;
+	struct tegra_bpmp_message msg;
+	unsigned int i;
+	int err;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.mrq = MRQ_EMC_DVFS_LATENCY;
+	msg.tx.data = NULL;
+	msg.tx.size = 0;
+	msg.rx.data = &response;
+	msg.rx.size = sizeof(response);
+
+	err = tegra_bpmp_transfer(emc->bpmp, &msg);
+	if (err < 0) {
+		dev_err(emc->dev, "failed to EMC DVFS pairs: %d\n", err);
+		return err;
+	}
+	if (msg.rx.ret < 0) {
+		dev_err(emc->dev, "EMC DVFS MRQ failed: %d (BPMP error code)\n", msg.rx.ret);
+		return -EINVAL;
+	}
+
+	emc->debugfs.min_rate = ULONG_MAX;
+	emc->debugfs.max_rate = 0;
+
+	emc->num_dvfs = response.num_pairs;
+
+	emc->dvfs = devm_kmalloc_array(emc->dev, emc->num_dvfs, sizeof(*emc->dvfs), GFP_KERNEL);
+	if (!emc->dvfs)
+		return -ENOMEM;
+
+	dev_dbg(emc->dev, "%u DVFS pairs:\n", emc->num_dvfs);
+
+	for (i = 0; i < emc->num_dvfs; i++) {
+		emc->dvfs[i].rate = response.pairs[i].freq * 1000;
+		emc->dvfs[i].latency = response.pairs[i].latency;
+
+		if (emc->dvfs[i].rate < emc->debugfs.min_rate)
+			emc->debugfs.min_rate = emc->dvfs[i].rate;
+
+		if (emc->dvfs[i].rate > emc->debugfs.max_rate)
+			emc->debugfs.max_rate = emc->dvfs[i].rate;
+
+		dev_dbg(emc->dev, "  %2u: %lu Hz -> %lu us\n", i,
+			emc->dvfs[i].rate, emc->dvfs[i].latency);
+	}
+
+	err = clk_set_rate_range(emc->clk, emc->debugfs.min_rate, emc->debugfs.max_rate);
+	if (err < 0) {
+		dev_err(emc->dev, "failed to set rate range [%lu-%lu] for %pC\n",
+			emc->debugfs.min_rate, emc->debugfs.max_rate, emc->clk);
+		return err;
+	}
+
+	emc->debugfs.root = debugfs_create_dir("emc", NULL);
+	debugfs_create_file("available_rates", 0444, emc->debugfs.root, emc,
+			    &tegra186_emc_debug_available_rates_fops);
+	debugfs_create_file("min_rate", 0644, emc->debugfs.root, emc,
+			    &tegra186_emc_debug_min_rate_fops);
+	debugfs_create_file("max_rate", 0644, emc->debugfs.root, emc,
+			    &tegra186_emc_debug_max_rate_fops);
+
+	return 0;
+}
+
 /*
  * tegra_emc_icc_set_bw() - Set BW api for EMC provider
  * @src: ICC node for External Memory Controller (EMC)
@@ -251,10 +318,7 @@ err_msg:
 static int tegra186_emc_probe(struct platform_device *pdev)
 {
 	struct tegra_mc *mc = dev_get_drvdata(pdev->dev.parent);
-	struct mrq_emc_dvfs_latency_response response;
-	struct tegra_bpmp_message msg;
 	struct tegra186_emc *emc;
-	unsigned int i;
 	int err;
 
 	emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL);
@@ -275,70 +339,12 @@ static int tegra186_emc_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, emc);
 	emc->dev = &pdev->dev;
 
-	memset(&msg, 0, sizeof(msg));
-	msg.mrq = MRQ_EMC_DVFS_LATENCY;
-	msg.tx.data = NULL;
-	msg.tx.size = 0;
-	msg.rx.data = &response;
-	msg.rx.size = sizeof(response);
-
-	err = tegra_bpmp_transfer(emc->bpmp, &msg);
-	if (err < 0) {
-		dev_err(&pdev->dev, "failed to EMC DVFS pairs: %d\n", err);
-		goto put_bpmp;
-	}
-	if (msg.rx.ret < 0) {
-		err = -EINVAL;
-		dev_err(&pdev->dev, "EMC DVFS MRQ failed: %d (BPMP error code)\n", msg.rx.ret);
-		goto put_bpmp;
-	}
-
-	emc->debugfs.min_rate = ULONG_MAX;
-	emc->debugfs.max_rate = 0;
-
-	emc->num_dvfs = response.num_pairs;
-
-	emc->dvfs = devm_kmalloc_array(&pdev->dev, emc->num_dvfs,
-				       sizeof(*emc->dvfs), GFP_KERNEL);
-	if (!emc->dvfs) {
-		err = -ENOMEM;
-		goto put_bpmp;
-	}
-
-	dev_dbg(&pdev->dev, "%u DVFS pairs:\n", emc->num_dvfs);
-
-	for (i = 0; i < emc->num_dvfs; i++) {
-		emc->dvfs[i].rate = response.pairs[i].freq * 1000;
-		emc->dvfs[i].latency = response.pairs[i].latency;
-
-		if (emc->dvfs[i].rate < emc->debugfs.min_rate)
-			emc->debugfs.min_rate = emc->dvfs[i].rate;
-
-		if (emc->dvfs[i].rate > emc->debugfs.max_rate)
-			emc->debugfs.max_rate = emc->dvfs[i].rate;
-
-		dev_dbg(&pdev->dev, "  %2u: %lu Hz -> %lu us\n", i,
-			emc->dvfs[i].rate, emc->dvfs[i].latency);
-	}
-
-	err = clk_set_rate_range(emc->clk, emc->debugfs.min_rate,
-				 emc->debugfs.max_rate);
-	if (err < 0) {
-		dev_err(&pdev->dev,
-			"failed to set rate range [%lu-%lu] for %pC\n",
-			emc->debugfs.min_rate, emc->debugfs.max_rate,
-			emc->clk);
-		goto put_bpmp;
+	if (tegra_bpmp_mrq_is_supported(emc->bpmp, MRQ_EMC_DVFS_LATENCY)) {
+		err = tegra186_emc_get_emc_dvfs_latency(emc);
+		if (err)
+			goto put_bpmp;
 	}
 
-	emc->debugfs.root = debugfs_create_dir("emc", NULL);
-	debugfs_create_file("available_rates", S_IRUGO, emc->debugfs.root,
-			    emc, &tegra186_emc_debug_available_rates_fops);
-	debugfs_create_file("min_rate", S_IRUGO | S_IWUSR, emc->debugfs.root,
-			    emc, &tegra186_emc_debug_min_rate_fops);
-	debugfs_create_file("max_rate", S_IRUGO | S_IWUSR, emc->debugfs.root,
-			    emc, &tegra186_emc_debug_max_rate_fops);
-
 	if (mc && mc->soc->icc_ops) {
 		if (tegra_bpmp_mrq_is_supported(emc->bpmp, MRQ_BWMGR_INT)) {
 			mc->bwmgr_mrq_supported = true;