linux-kernel - Re: [PATCH 6/6] thermal: Add Tegra SOCTHERM thermal management driver

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Message-ID: <53B66915.4040309@nvidia.com>
Date:	Fri, 4 Jul 2014 16:43:01 +0800
From:	Wei Ni <wni@...dia.com>
To:	Mikko Perttunen <mperttunen@...dia.com>,
	"rui.zhang@...el.com" <rui.zhang@...el.com>,
	"edubezval@...il.com" <edubezval@...il.com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"thierry.reding@...il.com" <thierry.reding@...il.com>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	Matthew Longnecker <MLongnecker@...dia.com>
CC:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 6/6] thermal: Add Tegra SOCTHERM thermal management driver

On 06/27/2014 04:11 PM, Mikko Perttunen wrote:
> This adds support for the Tegra SOCTHERM thermal sensing and management
> system found in the Tegra124 system-on-chip. This initial driver supports
> the four thermal zones with hardware-tracked trip points.

> diff --git a/drivers/thermal/tegra_soctherm.c b/drivers/thermal/tegra_soctherm.c

> +static int calculate_shared_calibration(struct tsensor_shared_calibration *r)
> +{
> +       u32 val;
> +       u32 shifted_cp, shifted_ft;
> +       int err;
> +
> +       err = tegra_fuse_readl(FUSE_TSENSOR8_CALIB, &val);
> +       if (err)
> +               return err;
> +       r->base_cp = val & 0x3ff;
> +       r->base_ft = (val & (0x7ff << 10)) >> 10;
> +
> +       err = tegra_fuse_readl(FUSE_SPARE_REALIGNMENT_REG_0, &val);
> +       if (err)
> +               return err;
> +       /* Sign extend from 6 bits to 32 bits */
> +       shifted_cp = (s32)((val & 0x1f) | ((val & 0x20) ? 0xffffffe0 : 0x0));
> +       val = ((val & (0x1f << 21)) >> 21);
> +       /* Sign extend from 5 bits to 32 bits */
> +       shifted_ft = (s32)((val & 0xf) | ((val & 0x10) ? 0xfffffff0 : 0x0));
> +
> +       r->actual_temp_cp = 2 * 25 + shifted_cp;
Do we need to define the "25" as constant, just like below line.

> +       r->actual_temp_ft = 2 * NOMINAL_CALIB_FT_T124 + shifted_ft;
> +
> +       return 0;
> +}

> +
> +static irqreturn_t soctherm_isr(int irq, void *dev_id)
> +{
> +       struct tegra_thermctl_zone *zone = dev_id;
> +       u32 val;
> +       u32 intr_mask = 0x03 << t124_thermctl_shifts[zone->sensor];
> +
> +       val = readl(zone->tegra->regs + THERMCTL_INTR_STATUS);
> +
> +       if ((val & intr_mask) == 0)
> +               return IRQ_NONE;
> +
> +       writel(val & intr_mask, zone->tegra->regs + THERMCTL_INTR_STATUS);
I think we need to disable the interrupt here, and enable it again after
updating the high/low limited values. If not, there will trigger mass of
interrupts.

> +
> +static struct platform_driver tegra_soctherm_driver = {
> +       .probe = tegra_soctherm_probe,
> +       .remove = tegra_soctherm_remove,
> +       .driver = {
> +               .name = "tegra_soctherm",
> +               .owner = THIS_MODULE,
> +               .of_match_table = tegra_soctherm_of_match,
> +       },
> +};
Will you consider to add suspend/resume support?

Thanks.
Wei.

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