[PATCH V4 09/11] thermal: tegra: add PM support

From: Wei Ni
Date: Mon Jan 25 2016 - 05:48:51 EST


Add suspend/resume function in soctherm driver.
And enable it for Tegra124 and Tegra210.

Signed-off-by: Wei Ni <wni@xxxxxxxxxx>
---
drivers/thermal/tegra/soctherm.c | 174 +++++++++++++++++++++++++++------------
1 file changed, 122 insertions(+), 52 deletions(-)

diff --git a/drivers/thermal/tegra/soctherm.c b/drivers/thermal/tegra/soctherm.c
index d9674b7a31ae..04530919aea4 100644
--- a/drivers/thermal/tegra/soctherm.c
+++ b/drivers/thermal/tegra/soctherm.c
@@ -94,19 +94,11 @@ 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);
@@ -117,9 +109,7 @@ 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);
}

/*
@@ -545,6 +535,74 @@ 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 int 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, err;
+ 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);
+
+ /* Initialize thermctl sensors */
+ err = tegra_soctherm_thermtrip(&pdev->dev);
+
+ return err;
+}
+
static const struct of_device_id tegra_soctherm_of_match[] = {
#ifdef CONFIG_ARCH_TEGRA_124_SOC
{
@@ -572,7 +630,6 @@ 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)
@@ -613,55 +670,35 @@ 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;

- /* Configure thermtrip */
- tegra_soctherm_thermtrip(&pdev->dev);
+ err = soctherm_init(pdev);
+ if (err) {
+ dev_err(&pdev->dev, "Initialize platform data failed\n");
+ goto disable_clocks;
+ }

for (i = 0; i < soc->num_ttgs; ++i) {
struct tegra_thermctl_zone *zone =
@@ -697,8 +734,7 @@ unregister_tzs:
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;
}
@@ -715,17 +751,51 @@ 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);
+ int err;
+
+ err = soctherm_clk_enable(pdev, true);
+ if (err) {
+ dev_err(&pdev->dev,
+ "Resume failed: enable clocks failed\n");
+ return err;
+ }
+
+ err = soctherm_init(pdev);
+ if (err) {
+ dev_err(&pdev->dev,
+ "Resume failed: initialize failed\n");
+ soctherm_clk_enable(pdev, false);
+ return err;
+ }

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