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Message-ID: <1456128743-29194-1-git-send-email-wni@nvidia.com>
Date: Mon, 22 Feb 2016 16:12:23 +0800
From: Wei Ni <wni@...dia.com>
To: <thierry.reding@...il.com>, <rui.zhang@...el.com>
CC: <MLongnecker@...dia.com>, <swarren@...dotorg.org>,
<mikko.perttunen@...si.fi>, <linux-tegra@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, Wei Ni <wni@...dia.com>
Subject: [PATCH v6 10/12] thermal: tegra: add PM support
Add suspend/resume function in soctherm driver.
And enable it for Tegra124 and Tegra210.
Signed-off-by: Wei Ni <wni@...dia.com>
---
drivers/thermal/tegra/soctherm.c | 168 +++++++++++++++++++++++++++------------
1 file changed, 117 insertions(+), 51 deletions(-)
diff --git a/drivers/thermal/tegra/soctherm.c b/drivers/thermal/tegra/soctherm.c
index 86c8ed8048f8..26f895b5d624 100644
--- a/drivers/thermal/tegra/soctherm.c
+++ b/drivers/thermal/tegra/soctherm.c
@@ -96,19 +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);
@@ -119,9 +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);
}
/*
@@ -426,6 +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);
+
+ /* 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
{
@@ -453,7 +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)
@@ -494,52 +546,31 @@ 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);
+ 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 =
@@ -579,9 +610,7 @@ unregister_tzs:
thermal_zone_of_sensor_unregister(&pdev->dev,
tegra->thermctl_tzs[i]);
-disable_clocks:
- clk_disable_unprepare(tegra->clock_tsensor);
- clk_disable_unprepare(tegra->clock_soctherm);
+ soctherm_clk_enable(pdev, false);
return err;
}
@@ -598,17 +627,54 @@ static int tegra_soctherm_remove(struct platform_device *pdev)
tegra->thermctl_tzs[i]);
}
- 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
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