linux-kernel - Re: [Patch v1 01/10] memory: tegra: add interconnect support for DRAM scaling in Tegra234

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Message-ID: <8641fad2-7170-4c0c-fbd6-6e2e784b3106@gmail.com>
Date:   Wed, 21 Dec 2022 19:54:58 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sumit Gupta <sumitg@...dia.com>, treding@...dia.com,
        krzysztof.kozlowski@...aro.org, dmitry.osipenko@...labora.com,
        viresh.kumar@...aro.org, rafael@...nel.org, jonathanh@...dia.com,
        robh+dt@...nel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     sanjayc@...dia.com, ksitaraman@...dia.com, ishah@...dia.com,
        bbasu@...dia.com
Subject: Re: [Patch v1 01/10] memory: tegra: add interconnect support for DRAM
 scaling in Tegra234

20.12.2022 19:02, Sumit Gupta пишет:
>  static int tegra186_emc_probe(struct platform_device *pdev)
>  {
>  	struct mrq_emc_dvfs_latency_response response;
>  	struct tegra_bpmp_message msg;
>  	struct tegra186_emc *emc;
> +	struct tegra_mc *mc;
>  	unsigned int i;
>  	int err;
>  
> @@ -158,6 +307,9 @@ static int tegra186_emc_probe(struct platform_device *pdev)
>  	if (!emc)
>  		return -ENOMEM;
>  
> +	platform_set_drvdata(pdev, emc);
> +	emc->dev = &pdev->dev;
> +
>  	emc->bpmp = tegra_bpmp_get(&pdev->dev);
>  	if (IS_ERR(emc->bpmp))
>  		return dev_err_probe(&pdev->dev, PTR_ERR(emc->bpmp), "failed to get BPMP\n");
> @@ -236,6 +388,19 @@ static int tegra186_emc_probe(struct platform_device *pdev)
>  	debugfs_create_file("max_rate", S_IRUGO | S_IWUSR, emc->debugfs.root,
>  			    emc, &tegra186_emc_debug_max_rate_fops);
>  
> +	mc = dev_get_drvdata(emc->dev->parent);
> +	if (mc && mc->soc->icc_ops) {
> +		if (tegra_bpmp_mrq_is_supported(emc->bpmp, MRQ_BWMGR_INT)) {
> +			err = tegra_emc_interconnect_init(emc);
> +			if (!err)
> +				return err;
> +			dev_err(&pdev->dev, "tegra_emc_interconnect_init failed:%d\n", err);
> +			goto put_bpmp;
> +		} else {
> +			dev_info(&pdev->dev, "MRQ_BWMGR_INT not present\n");
> +		}

If there is no MRQ_BWMGR_INT, then device drivers using ICC won't probe.
This is either a error condition, or ICC should inited and then ICC
changes should be skipped.