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drivers/rtc/rtc-s3c.c: fix incorrect way of save/restore of S3C2410_TICNT for TYPE_S3C64XX 

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>
This commit is contained in:
Vikas Sajjan 2014-03-03 15:38:31 -08:00 committed by Linus Torvalds
parent 0f55159d09
commit 40d2d968e9
1 changed files with 12 additions and 5 deletions
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17
drivers/rtc/rtc-s3c.c
View File

@ -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) {