drivers/rtc/rtc-s3c.c: fix incorrect way of save/restore of S3C2410_TICNT for TYPE_S3...

On exynos5250, exynos5420 and exynos5260 it was observed that, after 1
cycle of S2R, the rtc-tick occurs at a very fast rate as compared to the
rtc-tick occuring before S2R.

This patch fixes the above issue by correcting the wrong way of
save/restore of S3C2410_TICNT for TYPE_S3C64XX.

Signed-off-by: Vikas Sajjan <vikas.sajjan@samsung.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 7afd373b9595ff68b16238fc37688102dbaa04f4..c4cde9c08f1ffa9ed5c7c1d91a10b745ef7fdb3e 100644 (file)
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -580,10 +580,12 @@ static int s3c_rtc_suspend(struct device *dev)
 
        clk_enable(rtc_clk);
        /* save TICNT for anyone using periodic interrupts */
-       ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
        if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
                ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
                ticnt_en_save &= S3C64XX_RTCCON_TICEN;
+               ticnt_save = readl(s3c_rtc_base + S3C2410_TICNT);
+       } else {
+               ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
        }
        s3c_rtc_enable(pdev, 0);
 
@@ -605,10 +607,15 @@ static int s3c_rtc_resume(struct device *dev)
 
        clk_enable(rtc_clk);
        s3c_rtc_enable(pdev, 1);
-       writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
-       if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
-               tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
-               writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
+       if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
+               writel(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
+               if (ticnt_en_save) {
+                       tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
+                       writew(tmp | ticnt_en_save,
+                                       s3c_rtc_base + S3C2410_RTCCON);
+               }
+       } else {
+               writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
        }
 
        if (device_may_wakeup(dev) && wake_en) {