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Date:   Mon, 2 Apr 2018 14:56:50 +0530
From:   Viresh Kumar <viresh.kumar@linaro.org>
To:     Ilia Lin <ilialin@codeaurora.org>
Cc:     mturquette@baylibre.com, sboyd@kernel.org, robh@kernel.org,
        mark.rutland@arm.com, rjw@rjwysocki.net, lgirdwood@gmail.com,
        broonie@kernel.org, andy.gross@linaro.org, david.brown@linaro.org,
        catalin.marinas@arm.com, will.deacon@arm.com,
        linux-clk@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
        linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, rnayak@codeaurora.org,
        amit.kucheria@linaro.org, nicolas.dechesne@linaro.org,
        celster@codeaurora.org, tfinkel@codeaurora.org
Subject: Re: [PATCH v4 12/14] cpufreq: Add Kryo CPU scaling driver
Message-ID: <20180402092650.GB3572@vireshk-i7>
References: <1522358807-10413-1-git-send-email-ilialin@codeaurora.org>
 <1522358807-10413-13-git-send-email-ilialin@codeaurora.org>
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On 30-03-18, 00:26, Ilia Lin wrote:
> diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
> index 3b585e4..88e8a6e 100644
> --- a/drivers/cpufreq/cpufreq-dt-platdev.c
> +++ b/drivers/cpufreq/cpufreq-dt-platdev.c
> @@ -127,6 +127,9 @@
>  	{ .compatible = "ti,am43", },
>  	{ .compatible = "ti,dra7", },
>  
> +	{ .compatible = "qcom,msm8996", },
> +	{ .compatible = "qcom,apq8096", },
> +

This should be sorted in alphabetical order.

>  	{ }
>  };
>  
> diff --git a/drivers/cpufreq/qcom-cpufreq-kryo.c b/drivers/cpufreq/qcom-cpufreq-kryo.c
> new file mode 100644
> index 0000000..3cb51f8
> --- /dev/null
> +++ b/drivers/cpufreq/qcom-cpufreq-kryo.c
> @@ -0,0 +1,147 @@
> +/* Copyright (c) 2018, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * SPDX-License-Identifier: GPL-2.0
> + */

The format of putting SPDX licence identifier isn't this. Please check and fix
it.

> +
> +#include <linux/cpu.h>
> +#include <linux/err.h>
> +#include <linux/init.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/nvmem-consumer.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_opp.h>
> +#include <linux/slab.h>
> +#include <linux/soc/qcom/smem.h>
> +
> +#define MSM_ID_SMEM	137
> +#define SILVER_LEAD	0
> +#define GOLD_LEAD	2
> +
> +enum _msm_id {
> +	MSM8996V3 = 0xF6ul,
> +	APQ8096V3 = 0x123ul,
> +	MSM8996SG = 0x131ul,
> +	APQ8096SG = 0x138ul,
> +};
> +
> +enum _msm8996_version {
> +	MSM8996_V3,
> +	MSM8996_SG,
> +	NUM_OF_MSM8996_VERSIONS,
> +};
> +
> +static enum _msm8996_version __init qcom_cpufreq_kryo_get_msm_id(void)
> +{
> +	size_t len;
> +	u32 *msm_id;
> +	enum _msm8996_version version;
> +
> +	msm_id = qcom_smem_get(QCOM_SMEM_HOST_ANY, MSM_ID_SMEM, &len);
> +	/* The first 4 bytes are format, next to them is the actual msm-id */
> +	msm_id++;
> +
> +	switch ((enum _msm_id)*msm_id) {
> +	case MSM8996V3:
> +	case APQ8096V3:
> +		version = MSM8996_V3;
> +		break;
> +	case MSM8996SG:
> +	case APQ8096SG:
> +		version = MSM8996_SG;
> +		break;
> +	default:
> +		version = NUM_OF_MSM8996_VERSIONS;
> +	}
> +
> +	return version;
> +}
> +
> +static int __init qcom_cpufreq_kryo_driver_init(void)
> +{
> +	struct platform_device *pdev;
> +	struct device *cpu_dev;
> +	struct device_node *np;
> +	struct nvmem_cell *speedbin_nvmem;
> +	enum _msm8996_version msm8996_version;
> +	u8 *speedbin;
> +	size_t len;
> +	int ret;
> +	u32 versions;
> +
> +	cpu_dev = get_cpu_device(SILVER_LEAD);
> +	if (IS_ERR_OR_NULL(cpu_dev))
> +		return PTR_ERR(cpu_dev);
> +
> +	msm8996_version = qcom_cpufreq_kryo_get_msm_id();
> +	if (NUM_OF_MSM8996_VERSIONS == msm8996_version) {
> +		dev_err(cpu_dev, "Not Snapdragon 820/821!");
> +		return -ENODEV;
> +        }
> +
> +	np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
> +	if (IS_ERR_OR_NULL(np))
> +		return PTR_ERR(np);
> +
> +	if (!of_device_is_compatible(np, "operating-points-v2-kryo-cpu")) {
> +		ret = -ENOENT;
> +		goto free_np;
> +	}
> +
> +	speedbin_nvmem = of_nvmem_cell_get(np, NULL);
> +	if (IS_ERR(speedbin_nvmem)) {
> +		ret = PTR_ERR(speedbin_nvmem);
> +		dev_err(cpu_dev, "Could not get nvmem cell: %d\n", ret);
> +		goto free_np;
> +	}
> +
> +	speedbin = nvmem_cell_read(speedbin_nvmem, &len);
> +
> +	switch (msm8996_version) {
> +	case MSM8996_V3:
> +		versions = 1 << (unsigned int)(*speedbin);
> +		break;
> +	case MSM8996_SG:
> +		versions = 1 << ((unsigned int)(*speedbin) + 4);
> +		break;
> +	default:
> +		BUG();
> +		break;
> +	}
> +
> +	ret = PTR_ERR_OR_ZERO(dev_pm_opp_set_supported_hw(cpu_dev,&versions,1));
> +	if (0 > ret)
> +		goto free_np;
> +
> +	cpu_dev = get_cpu_device(GOLD_LEAD);
> +	ret = PTR_ERR_OR_ZERO(dev_pm_opp_set_supported_hw(cpu_dev,&versions,1));

What about undoing previous call on error here ?

> +
> +	of_node_put(np);
> +
> +	pdev = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
> +	if (IS_ERR(pdev)) {
> +		return PTR_ERR(pdev);
> +	}
> +
> +	return 0;
> +
> +free_np:
> +	of_node_put(np);
> +
> +	return ret;
> +}
> +late_initcall(qcom_cpufreq_kryo_driver_init);
> +
> +MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Kryo CPUfreq driver");
> +MODULE_LICENSE("GPL v2");
> -- 
> 1.9.1

-- 
viresh