rtc: mc13xxx: change RTC validation scheme

Datasheet says: "When the VSRTC voltage drops to the range of 0.9 - 0.8V,
the RTCPORB reset signal is generated and the contents of the RTC will
be reset.  <skip>.  To inform the processor that the contents of the RTC
are no longer valid due to the reset, a timer reset interrupt function
is implemented with the RTCRSTI bit." This patch makes the RTC valid by
default until RTCRST interrupt occurs.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Sascha Hauer <kernel@pengutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 14 insertions, 18 deletions

diff --git a/drivers/rtc/rtc-mc13xxx.c b/drivers/rtc/rtc-mc13xxx.c
index 0d60dd5273d1..7b39852eb542 100644
--- a/drivers/rtc/rtc-mc13xxx.c
+++ b/drivers/rtc/rtc-mc13xxx.c
@@ -64,12 +64,10 @@ static int mc13xxx_rtc_read_time(struct device *dev, struct rtc_time *tm)
         unsigned long s1970;
         int ret;
 
-        mc13xxx_lock(priv->mc13xxx);
+        if (!priv->valid)
+                return -ENODATA;
 
-        if (!priv->valid) {
-                ret = -ENODATA;
-                goto out;
-        }
+        mc13xxx_lock(priv->mc13xxx);
 
         ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days1);
         if (unlikely(ret))
@@ -154,11 +152,14 @@ static int mc13xxx_rtc_set_mmss(struct device *dev, unsigned long secs)
                         goto out;
         }
 
-        ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
-        if (unlikely(ret))
-                goto out;
+        if (!priv->valid) {
+                ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
+                if (unlikely(ret))
+                        goto out;
+
+                ret = mc13xxx_irq_unmask(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
+        }
 
-        ret = mc13xxx_irq_unmask(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
 out:
         priv->valid = !ret;
 
@@ -295,7 +296,7 @@ static irqreturn_t mc13xxx_rtc_reset_handler(int irq, void *dev)
         struct mc13xxx_rtc *priv = dev;
         struct mc13xxx *mc13xxx = priv->mc13xxx;
 
-        dev_dbg(&priv->rtc->dev, "RTCRST\n");
+        dev_warn(&priv->rtc->dev, "Contents of the RTC are no longer valid\n");
         priv->valid = 0;
 
         mc13xxx_irq_mask(mc13xxx, irq);
@@ -308,7 +309,6 @@ static int __init mc13xxx_rtc_probe(struct platform_device *pdev)
         int ret;
         struct mc13xxx_rtc *priv;
         struct mc13xxx *mc13xxx;
-        int rtcrst_pending;
 
         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
         if (!priv)
@@ -316,6 +316,7 @@ static int __init mc13xxx_rtc_probe(struct platform_device *pdev)
 
         mc13xxx = dev_get_drvdata(pdev->dev.parent);
         priv->mc13xxx = mc13xxx;
+        priv->valid = 1;
 
         platform_set_drvdata(pdev, priv);
 
@@ -326,18 +327,13 @@ static int __init mc13xxx_rtc_probe(struct platform_device *pdev)
 
         mc13xxx_lock(mc13xxx);
 
+        mc13xxx_irq_ack(mc13xxx, MC13XXX_IRQ_RTCRST);
+
         ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_RTCRST,
                         mc13xxx_rtc_reset_handler, DRIVER_NAME, priv);
         if (ret)
                 goto err_reset_irq_request;
 
-        ret = mc13xxx_irq_status(mc13xxx, MC13XXX_IRQ_RTCRST,
-                        NULL, &rtcrst_pending);
-        if (ret)
-                goto err_reset_irq_status;
-
-        priv->valid = !rtcrst_pending;
-
         ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_1HZ,
                         mc13xxx_rtc_update_handler, DRIVER_NAME, priv);
         if (ret)