| Message ID | 57C97BDD.4030101@sigmadesigns.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Marc Gonzalez <marc_gonzalez@sigmadesigns.com> writes: > When this platform is suspended, firmware powers the entire SoC down, > except a few hardware blocks waiting for wakeup events. There is no > context to save for this particular block. > > Therefore, there is nothing useful for the driver to do on suspend; > so we define a NULL suspend hook. On resume, the driver initializes > the block exactly as is done in the probe callback. > > Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com> Reviewed-by: Kevin Hilman <khilman@baylibre.com> > --- > Earlier versions of this patch were reviewed by Kevin and Thierry. > The current form is preferred by Arnd. > --- > drivers/thermal/tango_thermal.c | 19 +++++++++++++++++-- > 1 file changed, 17 insertions(+), 2 deletions(-) > > diff --git a/drivers/thermal/tango_thermal.c b/drivers/thermal/tango_thermal.c > index 70e0d9f406e9..201304aeafeb 100644 > --- a/drivers/thermal/tango_thermal.c > +++ b/drivers/thermal/tango_thermal.c > @@ -64,6 +64,12 @@ static const struct thermal_zone_of_device_ops ops = { > .get_temp = tango_get_temp, > }; > > +static void tango_thermal_init(struct tango_thermal_priv *priv) > +{ > + writel(0, priv->base + TEMPSI_CFG); > + writel(CMD_ON, priv->base + TEMPSI_CMD); > +} > + > static int tango_thermal_probe(struct platform_device *pdev) > { > struct resource *res; > @@ -79,14 +85,22 @@ static int tango_thermal_probe(struct platform_device *pdev) > if (IS_ERR(priv->base)) > return PTR_ERR(priv->base); > > + platform_set_drvdata(pdev, priv); > priv->thresh_idx = IDX_MIN; > - writel(0, priv->base + TEMPSI_CFG); > - writel(CMD_ON, priv->base + TEMPSI_CMD); > + tango_thermal_init(priv); > > tzdev = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, priv, &ops); > return PTR_ERR_OR_ZERO(tzdev); > } > > +static int __maybe_unused tango_thermal_resume(struct device *dev) > +{ > + tango_thermal_init(dev_get_drvdata(dev)); > + return 0; > +} > + > +static SIMPLE_DEV_PM_OPS(tango_thermal_pm, NULL, tango_thermal_resume); > + > static const struct of_device_id tango_sensor_ids[] = { > { > .compatible = "sigma,smp8758-thermal", > @@ -99,6 +113,7 @@ static struct platform_driver tango_thermal_driver = { > .driver = { > .name = "tango-thermal", > .of_match_table = tango_sensor_ids, > + .pm = &tango_thermal_pm, > }, > };
diff --git a/drivers/thermal/tango_thermal.c b/drivers/thermal/tango_thermal.c index 70e0d9f406e9..201304aeafeb 100644 --- a/drivers/thermal/tango_thermal.c +++ b/drivers/thermal/tango_thermal.c @@ -64,6 +64,12 @@ static const struct thermal_zone_of_device_ops ops = { .get_temp = tango_get_temp, }; +static void tango_thermal_init(struct tango_thermal_priv *priv) +{ + writel(0, priv->base + TEMPSI_CFG); + writel(CMD_ON, priv->base + TEMPSI_CMD); +} + static int tango_thermal_probe(struct platform_device *pdev) { struct resource *res; @@ -79,14 +85,22 @@ static int tango_thermal_probe(struct platform_device *pdev) if (IS_ERR(priv->base)) return PTR_ERR(priv->base); + platform_set_drvdata(pdev, priv); priv->thresh_idx = IDX_MIN; - writel(0, priv->base + TEMPSI_CFG); - writel(CMD_ON, priv->base + TEMPSI_CMD); + tango_thermal_init(priv); tzdev = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, priv, &ops); return PTR_ERR_OR_ZERO(tzdev); } +static int __maybe_unused tango_thermal_resume(struct device *dev) +{ + tango_thermal_init(dev_get_drvdata(dev)); + return 0; +} + +static SIMPLE_DEV_PM_OPS(tango_thermal_pm, NULL, tango_thermal_resume); + static const struct of_device_id tango_sensor_ids[] = { { .compatible = "sigma,smp8758-thermal", @@ -99,6 +113,7 @@ static struct platform_driver tango_thermal_driver = { .driver = { .name = "tango-thermal", .of_match_table = tango_sensor_ids, + .pm = &tango_thermal_pm, }, };
When this platform is suspended, firmware powers the entire SoC down, except a few hardware blocks waiting for wakeup events. There is no context to save for this particular block. Therefore, there is nothing useful for the driver to do on suspend; so we define a NULL suspend hook. On resume, the driver initializes the block exactly as is done in the probe callback. Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com> --- Earlier versions of this patch were reviewed by Kevin and Thierry. The current form is preferred by Arnd. --- drivers/thermal/tango_thermal.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-)