diff options
| -rw-r--r-- | drivers/memory/tegra/tegra186-emc.c | 136 |
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..83981ae3ea86 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", 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); + + 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; 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