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authorLoc Ho <lho@apm.com>2014-04-14 12:09:04 -0600
committerAlexandre Belloni <alexandre.belloni@free-electrons.com>2017-11-09 01:16:36 +0100
commitd0bcd82b13794c4bc89876e9383000fc1cb069d2 (patch)
treea08253f8e10ffc4a0275d089a17c1c488a236b0b /drivers/rtc
parent1856e0b2ace70a0231a94ec9d1286904c6ffa1ca (diff)
downloadlinux-d0bcd82b13794c4bc89876e9383000fc1cb069d2.tar.bz2
rtc: xgene: Fix suspend/resume
This patch fixes suspend/resume functions properly for the APM X-Gene SoC RTC driver. Signed-off-by: Loc Ho <lho@apm.com> Reviewed-by: Mark Brown <broonie@linaro.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-xgene.c41
1 files changed, 32 insertions, 9 deletions
diff --git a/drivers/rtc/rtc-xgene.c b/drivers/rtc/rtc-xgene.c
index 65b432a096fe..360eae24a8c8 100644
--- a/drivers/rtc/rtc-xgene.c
+++ b/drivers/rtc/rtc-xgene.c
@@ -52,6 +52,7 @@ struct xgene_rtc_dev {
void __iomem *csr_base;
struct clk *clk;
unsigned int irq_wake;
+ unsigned int irq_enabled;
};
static int xgene_rtc_read_time(struct device *dev, struct rtc_time *tm)
@@ -104,15 +105,19 @@ static int xgene_rtc_alarm_irq_enable(struct device *dev, u32 enabled)
return 0;
}
+static int xgene_rtc_alarm_irq_enabled(struct device *dev)
+{
+ struct xgene_rtc_dev *pdata = dev_get_drvdata(dev);
+
+ return readl(pdata->csr_base + RTC_CCR) & RTC_CCR_IE ? 1 : 0;
+}
+
static int xgene_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct xgene_rtc_dev *pdata = dev_get_drvdata(dev);
- unsigned long rtc_time;
unsigned long alarm_time;
- rtc_time = readl(pdata->csr_base + RTC_CCVR);
rtc_tm_to_time(&alrm->time, &alarm_time);
-
pdata->alarm_time = alarm_time;
writel((u32) pdata->alarm_time, pdata->csr_base + RTC_CMR);
@@ -180,12 +185,18 @@ static int xgene_rtc_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "Couldn't get the clock for RTC\n");
return -ENODEV;
}
- clk_prepare_enable(pdata->clk);
+ ret = clk_prepare_enable(pdata->clk);
+ if (ret)
+ return ret;
/* Turn on the clock and the crystal */
writel(RTC_CCR_EN, pdata->csr_base + RTC_CCR);
- device_init_wakeup(&pdev->dev, 1);
+ ret = device_init_wakeup(&pdev->dev, 1);
+ if (ret) {
+ clk_disable_unprepare(pdata->clk);
+ return ret;
+ }
pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
&xgene_rtc_ops, THIS_MODULE);
@@ -218,14 +229,20 @@ static int xgene_rtc_suspend(struct device *dev)
int irq;
irq = platform_get_irq(pdev, 0);
+
+ /*
+ * If this RTC alarm will be used for waking the system up,
+ * don't disable it of course. Else we just disable the alarm
+ * and await suspension.
+ */
if (device_may_wakeup(&pdev->dev)) {
if (!enable_irq_wake(irq))
pdata->irq_wake = 1;
} else {
+ pdata->irq_enabled = xgene_rtc_alarm_irq_enabled(dev);
xgene_rtc_alarm_irq_enable(dev, 0);
- clk_disable(pdata->clk);
+ clk_disable_unprepare(pdata->clk);
}
-
return 0;
}
@@ -234,16 +251,22 @@ static int xgene_rtc_resume(struct device *dev)
struct platform_device *pdev = to_platform_device(dev);
struct xgene_rtc_dev *pdata = platform_get_drvdata(pdev);
int irq;
+ int rc;
irq = platform_get_irq(pdev, 0);
+
if (device_may_wakeup(&pdev->dev)) {
if (pdata->irq_wake) {
disable_irq_wake(irq);
pdata->irq_wake = 0;
}
} else {
- clk_enable(pdata->clk);
- xgene_rtc_alarm_irq_enable(dev, 1);
+ rc = clk_prepare_enable(pdata->clk);
+ if (rc) {
+ dev_err(dev, "Unable to enable clock error %d\n", rc);
+ return rc;
+ }
+ xgene_rtc_alarm_irq_enable(dev, pdata->irq_enabled);
}
return 0;