Thermal: imx: add clk disable/enable for suspend/resume
authorAnson Huang <b20788@freescale.com>
Tue, 6 Jan 2015 10:50:22 +0000 (18:50 +0800)
committerEduardo Valentin <edubezval@gmail.com>
Tue, 6 Jan 2015 13:35:15 +0000 (09:35 -0400)
Thermal sensor's clk is from pll3_usb_otg, per hardware
design requirement, need to make sure pll3_usb_otg is disabled
before STOP mode is entered, otherwise, all PFDs under it may
enter incorrect state, this patch disables pll3_usb_otg before
suspend and enables it after resume.

Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
drivers/thermal/imx_thermal.c

index c1188ac053c9650ce163a3e9e37f34a877959dc2..2ccbc0788353e9488e3f730de80d52ecafaf9082 100644 (file)
@@ -608,6 +608,7 @@ static int imx_thermal_suspend(struct device *dev)
        regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
        regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
        data->mode = THERMAL_DEVICE_DISABLED;
+       clk_disable_unprepare(data->thermal_clk);
 
        return 0;
 }
@@ -617,6 +618,7 @@ static int imx_thermal_resume(struct device *dev)
        struct imx_thermal_data *data = dev_get_drvdata(dev);
        struct regmap *map = data->tempmon;
 
+       clk_prepare_enable(data->thermal_clk);
        /* Enabled thermal sensor after resume */
        regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
        regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);