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Message-id: <1439374906-27841-1-git-send-email-jy0922.shim@samsung.com>
Date: Wed, 12 Aug 2015 19:21:46 +0900
From: Joonyoung Shim <jy0922.shim@...sung.com>
To: rtc-linux@...glegroups.com
Cc: linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
stable@...r.kernel.org, a.zummo@...ertech.it,
alexandre.belloni@...e-electrons.com, cw00.choi@...sung.com,
k.kozlowski@...sung.com, jy0922.shim@...sung.com
Subject: [PATCH v2] rtc: s3c: fix disabled clocks for alarm
The clock enable/disable codes for alarm have been removed from
commit 24e1455493da ("drivers/rtc/rtc-s3c.c: delete duplicate clock
control") and the clocks are disabled even if alarm is set, so alarm
interrupt can't happen.
The s3c_rtc_setaie function can be called several times with 'enabled'
argument having same value, so it needs to check whether clocks are
enabled or not.
Signed-off-by: Joonyoung Shim <jy0922.shim@...sung.com>
Cc: <stable@...r.kernel.org> # v4.1
---
This is v2 of prior patch "[PATCH 4/4] rtc: s3c: enable/disable clocks
for alarm".
Changelog for v2:
- commit messages is modified by Krzysztof suggestion
- make to backportable patch
- add Cc-stable
drivers/rtc/rtc-s3c.c | 24 ++++++++++++++++++------
1 file changed, 18 insertions(+), 6 deletions(-)
diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 44b2921..7cc8f73 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -39,6 +39,7 @@ struct s3c_rtc {
void __iomem *base;
struct clk *rtc_clk;
struct clk *rtc_src_clk;
+ bool clk_disabled;
struct s3c_rtc_data *data;
@@ -71,9 +72,12 @@ static void s3c_rtc_enable_clk(struct s3c_rtc *info)
unsigned long irq_flags;
spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
- clk_enable(info->rtc_clk);
- if (info->data->needs_src_clk)
- clk_enable(info->rtc_src_clk);
+ if (info->clk_disabled) {
+ clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
+ info->clk_disabled = false;
+ }
spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
}
@@ -82,9 +86,12 @@ static void s3c_rtc_disable_clk(struct s3c_rtc *info)
unsigned long irq_flags;
spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
- if (info->data->needs_src_clk)
- clk_disable(info->rtc_src_clk);
- clk_disable(info->rtc_clk);
+ if (!info->clk_disabled) {
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
+ clk_disable(info->rtc_clk);
+ info->clk_disabled = true;
+ }
spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
}
@@ -128,6 +135,11 @@ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
s3c_rtc_disable_clk(info);
+ if (enabled)
+ s3c_rtc_enable_clk(info);
+ else
+ s3c_rtc_disable_clk(info);
+
return 0;
}
--
1.9.1
--
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