thermal: tegra: allow sensor registeration to fail

Message ID 1509148453-11388-1-git-send-email-nicoleotsuka@gmail.com
State New
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Series
  • thermal: tegra: allow sensor registeration to fail
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Commit Message

Nicolin Chen Oct. 27, 2017, 11:54 p.m.
Not all sensors may be used on a platform. So there could be
some missing thermal zones in the Device Tree. However, the
the driver now errors out whenever a sensor fails to register
the thermal zone.

Since the driver could live with other sensors, this change
allows other sensors to continue the registerations even if
one sensor fails to register.

Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
---
 drivers/thermal/tegra/soctherm.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

Comments

Eduardo Valentin Dec. 5, 2017, 2:46 a.m. | #1
Hello,

On Fri, Oct 27, 2017 at 04:54:13PM -0700, Nicolin Chen wrote:
> Not all sensors may be used on a platform. So there could be
> some missing thermal zones in the Device Tree. However, the
> the driver now errors out whenever a sensor fails to register
> the thermal zone.
> 
> Since the driver could live with other sensors, this change
> allows other sensors to continue the registerations even if
> one sensor fails to register.

What would be the use case you want to have your chip running with
failed to probe thermal zones ? If they are failing to probe
shouldnt you fix the DT nodes?

a system with correct DT, failed to probe zones is a real bug.
Either in the DT or in the code.

> 
> Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
> ---
> 
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Patch

diff --git a/drivers/thermal/tegra/soctherm.c b/drivers/thermal/tegra/soctherm.c
index 455b58c..73fcd48 100644
--- a/drivers/thermal/tegra/soctherm.c
+++ b/drivers/thermal/tegra/soctherm.c
@@ -1280,7 +1280,7 @@  static int tegra_soctherm_probe(struct platform_device *pdev)
 	struct tsensor_shared_calib shared_calib;
 	struct resource *res;
 	struct tegra_soctherm_soc *soc;
-	unsigned int i;
+	unsigned int i, e;
 	int err;
 
 	match = of_match_node(tegra_soctherm_of_match, pdev->dev.of_node);
@@ -1377,7 +1377,7 @@  static int tegra_soctherm_probe(struct platform_device *pdev)
 
 	soctherm_init(pdev);
 
-	for (i = 0; i < soc->num_ttgs; ++i) {
+	for (i = 0, e = 0; i < soc->num_ttgs; ++i) {
 		struct tegra_thermctl_zone *zone =
 			devm_kzalloc(&pdev->dev, sizeof(*zone), GFP_KERNEL);
 		if (!zone) {
@@ -1397,7 +1397,10 @@  static int tegra_soctherm_probe(struct platform_device *pdev)
 			err = PTR_ERR(z);
 			dev_err(&pdev->dev, "failed to register sensor: %d\n",
 				err);
-			goto disable_clocks;
+			/* Check if all sensors failed to register */
+			if (++e == soc->num_ttgs)
+				goto disable_clocks;
+			continue;
 		}
 
 		zone->tz = z;
@@ -1459,6 +1462,9 @@  static int __maybe_unused soctherm_resume(struct device *dev)
 		struct thermal_zone_device *tz;
 
 		tz = tegra->thermctl_tzs[soc->ttgs[i]->id];
+		if (!tz)
+			continue;
+
 		err = tegra_soctherm_set_hwtrips(dev, soc->ttgs[i], tz);
 		if (err) {
 			dev_err(&pdev->dev,