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Date: Tue, 15 Mar 2016 17:25:20 +0800
From: Wei Ni <wni@...dia.com>
To: Eduardo Valentin <edubezval@...il.com>
CC: <rui.zhang@...el.com>, <thierry.reding@...il.com>,
<MLongnecker@...dia.com>, <swarren@...dotorg.org>,
<mikko.perttunen@...si.fi>, <linux-tegra@...r.kernel.org>,
<linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V7 10/12] thermal: tegra: add PM support
On 2016年03月15日 03:23, Eduardo Valentin wrote:
> * PGP Signed by an unknown key
>
> On Fri, Mar 11, 2016 at 11:11:26AM +0800, Wei Ni wrote:
>> Add suspend/resume function in soctherm driver.
>> And enable it for Tegra124 and Tegra210.
>
> I would prefer you either improve the description of changes needed to
> get suspend and resume fully working or you split this patch into
> smaller and properly described patches.
>
> Looks like you need at least to:
> (1) handle clocks
> (2) reprogram hw trips,
Yes, I didn't change the logic of these codes, just reprogram following things:
(1) move clocks code to the soctherm_clk_enable(), so that the suspend/resume
can call it directly.
(2) move some HW initialization to the soctherm_init(), so that the
suspend/resume can call them.
Yes, it's better to split this patch into smaller. Will do it.
>
> right?
>
>
>>
>> Signed-off-by: Wei Ni <wni@...dia.com>
>> ---
>> drivers/thermal/tegra/soctherm.c | 175 ++++++++++++++++++++++++++++-----------
>> 1 file changed, 125 insertions(+), 50 deletions(-)
>>
>> diff --git a/drivers/thermal/tegra/soctherm.c b/drivers/thermal/tegra/soctherm.c
>> index dbaab160baba..702d9cf3969d 100644
>> --- a/drivers/thermal/tegra/soctherm.c
>> +++ b/drivers/thermal/tegra/soctherm.c
>> @@ -88,6 +88,7 @@ struct tegra_soctherm {
>> struct clk *clock_tsensor;
>> struct clk *clock_soctherm;
>> void __iomem *regs;
>> + struct thermal_zone_device **thermctl_tzs;
>>
>> u32 *calib;
>> struct tegra_soctherm_soc *soc;
>> @@ -95,19 +96,11 @@ struct tegra_soctherm {
>> struct dentry *debugfs_dir;
>> };
>>
>> -static int enable_tsensor(struct tegra_soctherm *tegra,
>> - unsigned int i,
>> - const struct tsensor_shared_calib *shared)
>> +static void enable_tsensor(struct tegra_soctherm *tegra, unsigned int i)
>> {
>> const struct tegra_tsensor *sensor = &tegra->soc->tsensors[i];
>> void __iomem *base = tegra->regs + sensor->base;
>> - u32 *calib = &tegra->calib[i];
>> unsigned int val;
>> - int err;
>> -
>> - err = tegra_calc_tsensor_calib(sensor, shared, calib);
>> - if (err)
>> - return err;
>>
>> val = sensor->config->tall << SENSOR_CONFIG0_TALL_SHIFT;
>> writel(val, base + SENSOR_CONFIG0);
>> @@ -118,9 +111,7 @@ static int enable_tsensor(struct tegra_soctherm *tegra,
>> val |= SENSOR_CONFIG1_TEMP_ENABLE;
>> writel(val, base + SENSOR_CONFIG1);
>>
>> - writel(*calib, base + SENSOR_CONFIG2);
>> -
>> - return 0;
>> + writel(tegra->calib[i], base + SENSOR_CONFIG2);
>> }
>>
>> /*
>> @@ -425,6 +416,69 @@ static inline void soctherm_debug_init(struct platform_device *pdev)
>> }
>> #endif
>>
>> +static int soctherm_clk_enable(struct platform_device *pdev, bool enable)
>> +{
>> + struct tegra_soctherm *tegra = platform_get_drvdata(pdev);
>> + int err;
>> +
>> + if (tegra->clock_soctherm == NULL || tegra->clock_tsensor == NULL)
>> + return -EINVAL;
>> +
>> + reset_control_assert(tegra->reset);
>> +
>> + if (enable) {
>> + err = clk_prepare_enable(tegra->clock_soctherm);
>> + if (err) {
>> + reset_control_deassert(tegra->reset);
>> + return err;
>> + }
>> +
>> + err = clk_prepare_enable(tegra->clock_tsensor);
>> + if (err) {
>> + clk_disable_unprepare(tegra->clock_soctherm);
>> + reset_control_deassert(tegra->reset);
>> + return err;
>> + }
>> + } else {
>> + clk_disable_unprepare(tegra->clock_tsensor);
>> + clk_disable_unprepare(tegra->clock_soctherm);
>> + }
>> +
>> + reset_control_deassert(tegra->reset);
>> +
>> + return 0;
>> +}
>> +
>> +static void soctherm_init(struct platform_device *pdev)
>> +{
>> + struct tegra_soctherm *tegra = platform_get_drvdata(pdev);
>> + const struct tegra_tsensor_group **ttgs = tegra->soc->ttgs;
>> + int i;
>> + u32 pdiv, hotspot;
>> +
>> + /* Initialize raw sensors */
>> + for (i = 0; i < tegra->soc->num_tsensors; ++i)
>> + enable_tsensor(tegra, i);
>> +
>> + /* Wait for sensor data to be ready */
>> + usleep_range(1000, 5000);
>
>
> Is this range applicable for all supported chip versions?
Hmm, I made a mistake, this come from my old driver. I will remove it.
>
>> +
>> + /* program pdiv and hotspot offsets per THERM */
>> + pdiv = readl(tegra->regs + SENSOR_PDIV);
>> + hotspot = readl(tegra->regs + SENSOR_HOTSPOT_OFF);
>> + for (i = 0; i < tegra->soc->num_ttgs; ++i) {
>> + pdiv = REG_SET_MASK(pdiv, ttgs[i]->pdiv_mask,
>> + ttgs[i]->pdiv);
>> + if (ttgs[i]->id == TEGRA124_SOCTHERM_SENSOR_PLLX)
>> + continue;
>> + hotspot = REG_SET_MASK(hotspot,
>> + ttgs[i]->pllx_hotspot_mask,
>> + ttgs[i]->pllx_hotspot_diff);
>> + }
>> + writel(pdiv, tegra->regs + SENSOR_PDIV);
>> + writel(hotspot, tegra->regs + SENSOR_HOTSPOT_OFF);
>> +}
>> +
>> static const struct of_device_id tegra_soctherm_of_match[] = {
>> #ifdef CONFIG_ARCH_TEGRA_124_SOC
>> {
>> @@ -452,7 +506,6 @@ static int tegra_soctherm_probe(struct platform_device *pdev)
>> struct tegra_soctherm_soc *soc;
>> unsigned int i;
>> int err;
>> - u32 pdiv, hotspot;
>>
>> match = of_match_node(tegra_soctherm_of_match, pdev->dev.of_node);
>> if (!match)
>> @@ -493,52 +546,37 @@ static int tegra_soctherm_probe(struct platform_device *pdev)
>> return PTR_ERR(tegra->clock_soctherm);
>> }
>>
>> - reset_control_assert(tegra->reset);
>> -
>> - err = clk_prepare_enable(tegra->clock_soctherm);
>> - if (err)
>> - return err;
>> -
>> - err = clk_prepare_enable(tegra->clock_tsensor);
>> - if (err) {
>> - clk_disable_unprepare(tegra->clock_soctherm);
>> - return err;
>> - }
>> -
>> - reset_control_deassert(tegra->reset);
>> -
>> - /* Initialize raw sensors */
>> -
>> tegra->calib = devm_kzalloc(&pdev->dev,
>> sizeof(u32) * soc->num_tsensors,
>> GFP_KERNEL);
>> if (!tegra->calib)
>> return -ENOMEM;
>>
>> + /* calculate shared calibration data */
>> err = tegra_calc_shared_calib(soc->tfuse, &shared_calib);
>> if (err)
>> - goto disable_clocks;
>> + return err;
>>
>> + /* calculate tsensor calibaration data */
>> for (i = 0; i < soc->num_tsensors; ++i) {
>> - err = enable_tsensor(tegra, i, &shared_calib);
>> + err = tegra_calc_tsensor_calib(&soc->tsensors[i],
>> + &shared_calib,
>> + &tegra->calib[i]);
>> if (err)
>> - goto disable_clocks;
>> + return err;
>> }
>>
>> - /* Program pdiv and hotspot offsets per THERM */
>> - pdiv = readl(tegra->regs + SENSOR_PDIV);
>> - hotspot = readl(tegra->regs + SENSOR_HOTSPOT_OFF);
>> - for (i = 0; i < soc->num_ttgs; ++i) {
>> - pdiv = REG_SET_MASK(pdiv, soc->ttgs[i]->pdiv_mask,
>> - soc->ttgs[i]->pdiv);
>> - if (soc->ttgs[i]->id == TEGRA124_SOCTHERM_SENSOR_PLLX)
>> - continue;
>> - hotspot = REG_SET_MASK(hotspot,
>> - soc->ttgs[i]->pllx_hotspot_mask,
>> - soc->ttgs[i]->pllx_hotspot_diff);
>> - }
>> - writel(pdiv, tegra->regs + SENSOR_PDIV);
>> - writel(hotspot, tegra->regs + SENSOR_HOTSPOT_OFF);
>> + tegra->thermctl_tzs = devm_kzalloc(&pdev->dev,
>> + sizeof(*z) * soc->num_ttgs,
>> + GFP_KERNEL);
>> + if (!tegra->thermctl_tzs)
>> + return -ENOMEM;
>> +
>> + err = soctherm_clk_enable(pdev, true);
>> + if (err)
>> + return err;
>> +
>> + soctherm_init(pdev);
>>
>> for (i = 0; i < soc->num_ttgs; ++i) {
>> struct tegra_thermctl_zone *zone =
>> @@ -563,6 +601,7 @@ static int tegra_soctherm_probe(struct platform_device *pdev)
>> }
>>
>> zone->tz = z;
>> + tegra->thermctl_tzs[soc->ttgs[i]->id] = z;
>>
>> /* Configure hw trip points */
>> tegra_soctherm_set_hwtrips(&pdev->dev, soc->ttgs[i], z);
>> @@ -573,8 +612,7 @@ static int tegra_soctherm_probe(struct platform_device *pdev)
>> return 0;
>>
>> disable_clocks:
>> - clk_disable_unprepare(tegra->clock_tsensor);
>> - clk_disable_unprepare(tegra->clock_soctherm);
>> + soctherm_clk_enable(pdev, false);
>>
>> return err;
>> }
>> @@ -585,17 +623,54 @@ static int tegra_soctherm_remove(struct platform_device *pdev)
>>
>> debugfs_remove_recursive(tegra->debugfs_dir);
>>
>> - clk_disable_unprepare(tegra->clock_tsensor);
>> - clk_disable_unprepare(tegra->clock_soctherm);
>> + soctherm_clk_enable(pdev, false);
>> +
>> + return 0;
>> +}
>> +
>> +static int soctherm_suspend(struct device *dev)
>> +{
>> + struct platform_device *pdev = to_platform_device(dev);
>> +
>> + soctherm_clk_enable(pdev, false);
>>
>> return 0;
>> }
>>
>> +static int soctherm_resume(struct device *dev)
>> +{
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct tegra_soctherm *tegra = platform_get_drvdata(pdev);
>> + struct tegra_soctherm_soc *soc = tegra->soc;
>> + int err, i;
>> +
>> + err = soctherm_clk_enable(pdev, true);
>> + if (err) {
>> + dev_err(&pdev->dev,
>> + "Resume failed: enable clocks failed\n");
>> + return err;
>> + }
>> +
>> + soctherm_init(pdev);
>> +
>> + for (i = 0; i < soc->num_ttgs; ++i) {
>> + struct thermal_zone_device *tz;
>> +
>> + tz = tegra->thermctl_tzs[soc->ttgs[i]->id];
>> + tegra_soctherm_set_hwtrips(dev, soc->ttgs[i], tz);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static SIMPLE_DEV_PM_OPS(tegra_soctherm_pm, soctherm_suspend, soctherm_resume);
>> +
>> static struct platform_driver tegra_soctherm_driver = {
>> .probe = tegra_soctherm_probe,
>> .remove = tegra_soctherm_remove,
>> .driver = {
>> .name = "tegra_soctherm",
>> + .pm = &tegra_soctherm_pm,
>> .of_match_table = tegra_soctherm_of_match,
>> },
>> };
>> --
>> 1.9.1
>>
>
> * Unknown Key
> * 0x7DA4E256
>
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