linux-kernel - Re: [PATCH v3 2/3] soc: starfive: Add StarFive JH71XX pmu driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <0ce3f9ba-4cb4-4257-21f3-818ff0b959cd@starfivetech.com>
Date:   Wed, 18 Jan 2023 14:45:43 +0800
From:   Walker Chen <walker.chen@...rfivetech.com>
To:     Heiko Stübner <heiko@...ech.de>,
        <linux-riscv@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>
CC:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/3] soc: starfive: Add StarFive JH71XX pmu driver

On 2023/1/17 18:09, Heiko Stübner wrote:
> Hi Walker,
> 
> Am Montag, 16. Januar 2023, 08:42:58 CET schrieb Walker Chen:
>> +static int jh71xx_pmu_get_state(struct jh71xx_pmu_dev *pmd, u32 mask, bool *is_on)
>> +{
>> +	struct jh71xx_pmu *pmu = pmd->pmu;
>> +
>> +	if (!mask) {
>> +		*is_on = false;
> 
> nit: While it's not necessarily bad, I don't think callers of
> jh71xx_pmu_get_state() should expect this to be set in error case.

Maybe setting 'is_on' in this case is redundant operation. Will be dropped.

> 
>> +		return -EINVAL;
>> +	}
>> +
>> +	*is_on = readl(pmu->base + JH71XX_PMU_CURR_POWER_MODE) & mask;
>> +
>> +	return 0;
>> +}
> 
> [...]
> 
>> +static int jh71xx_pmu_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct device_node *np = dev->of_node;
>> +	const struct jh71xx_pmu_match_data *match_data;
>> +	struct jh71xx_pmu *pmu;
>> +	unsigned int i;
>> +	int ret;
>> +
>> +	pmu = devm_kzalloc(dev, sizeof(*pmu), GFP_KERNEL);
>> +	if (!pmu)
>> +		return -ENOMEM;
>> +
>> +	pmu->base = devm_platform_ioremap_resource(pdev, 0);
>> +	if (IS_ERR(pmu->base))
>> +		return PTR_ERR(pmu->base);
>> +
>> +	pmu->irq = platform_get_irq(pdev, 0);
>> +	if (pmu->irq < 0)
>> +		return pmu->irq;
>> +
>> +	ret = devm_request_irq(dev, pmu->irq, jh71xx_pmu_interrupt,
>> +			       0, pdev->name, pmu);
>> +	if (ret)
>> +		dev_err(dev, "failed to request irq\n");
>> +
>> +	match_data = of_device_get_match_data(dev);
>> +	if (!match_data)
>> +		return -EINVAL;
>> +
>> +	pmu->genpd = devm_kcalloc(dev, match_data->num_domains,
>> +				  sizeof(struct generic_pm_domain *),
>> +				  GFP_KERNEL);
>> +	if (!pmu->genpd)
>> +		return -ENOMEM;
>> +
>> +	pmu->dev = dev;
>> +	pmu->match_data = match_data;
>> +	pmu->genpd_data.domains = pmu->genpd;
>> +	pmu->genpd_data.num_domains = match_data->num_domains;
>> +
>> +	for (i = 0; i < match_data->num_domains; i++) {
>> +		ret = jh71xx_pmu_init_domain(pmu, i);
>> +		if (ret) {
>> +			dev_err(dev, "failed to initialize power domain\n");
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	spin_lock_init(&pmu->lock);
>> +	jh71xx_pmu_int_enable(pmu, JH71XX_PMU_INT_ALL_MASK & ~JH71XX_PMU_INT_PCH_FAIL, true);
>> +
>> +	ret = of_genpd_add_provider_onecell(np, &pmu->genpd_data);
>> +	if (ret) {
>> +		dev_err(dev, "failed to register genpd driver: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	dev_info(dev, "registered %u power domains\n", i);
> 
> nit: I guess that could be a dev_dbg to not spam the kernel log too much?

OK, will be used with dev_dbg().

> 
> 
>> +	return 0;
>> +}
>> +
>> +static const struct jh71xx_domain_info jh7110_power_domains[] = {
>> +	[JH7110_PD_SYSTOP] = {
>> +		.name = "SYSTOP",
>> +		.bit = 0,
>> +		.flags = GENPD_FLAG_ALWAYS_ON,
>> +	},
>> +	[JH7110_PD_CPU] = {
>> +		.name = "CPU",
>> +		.bit = 1,
>> +		.flags = GENPD_FLAG_ALWAYS_ON,
>> +	},
>> +	[JH7110_PD_GPUA] = {
>> +		.name = "GPUA",
>> +		.bit = 2,
>> +	},
>> +	[JH7110_PD_VDEC] = {
>> +		.name = "VDEC",
>> +		.bit = 3,
>> +	},
>> +	[JH7110_PD_VOUT] = {
>> +		.name = "VOUT",
>> +		.bit = 4,
>> +	},
>> +	[JH7110_PD_ISP] = {
>> +		.name = "ISP",
>> +		.bit = 5,
>> +	},
>> +	[JH7110_PD_VENC] = {
>> +		.name = "VENC",
>> +		.bit = 6,
>> +	},
>> +};
>> +
>> +static const struct jh71xx_pmu_match_data jh7110_pmu = {
>> +	.num_domains = ARRAY_SIZE(jh7110_power_domains),
>> +	.domain_info = jh7110_power_domains,
>> +};
>> +
>> +static const struct of_device_id jh71xx_pmu_of_match[] = {
>> +	{
>> +		.compatible = "starfive,jh7110-pmu",
>> +		.data = (void *)&jh7110_pmu,
>> +	}, {
>> +		/* sentinel */
>> +	}
>> +};
>> +
>> +static struct platform_driver jh71xx_pmu_driver = {
>> +	.driver = {
>> +		.name = "jh71xx-pmu",
>> +		.of_match_table = jh71xx_pmu_of_match,
> 
> In the rockchip pm-domains driver we have
> 
>                 /*
>                  * We can't forcibly eject devices from the power
>                  * domain, so we can't really remove power domains
>                  * once they were added.
>                  */
>                 .suppress_bind_attrs = true,
> 
> here, which might be valid for your pmu driver as well.

Okay, this attribute will be added in next version.

> 
> 
> Other than that
> Reviewed-by: Heiko Stuebner <heiko@...ech.de>
> 

Thanks for your review.

Best regards,
Walker Chen