Commit-ID: 8b2463d8cae2dda0c98ab5a15f25a0350a0e998d
Gitweb: http://git.kernel.org/tip/8b2463d8cae2dda0c98ab5a15f25a0350a0e998d
Author: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
AuthorDate: Tue, 4 Mar 2014 15:25:56 +0100
Committer: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
CommitDate: Wed, 2 Jul 2014 16:01:50 +0200
clocksource: sh_mtu2: Replace global spinlock with a per-device spinlock
The global spinlock is used to protect the shared start/stop register.
Now that all MTU2 channels are handled by a single device instance, use
a per-device spinlock.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
Tested-by: Wolfram Sang <wsa@xxxxxxxxxxxxxxxxxxxx>
---
drivers/clocksource/sh_mtu2.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c
index 0342e4a..b0c229f 100644
--- a/drivers/clocksource/sh_mtu2.c
+++ b/drivers/clocksource/sh_mtu2.c
@@ -47,14 +47,14 @@ struct sh_mtu2_device {
void __iomem *mapbase;
struct clk *clk;
+ raw_spinlock_t lock; /* Protect the shared registers */
+
struct sh_mtu2_channel *channels;
unsigned int num_channels;
bool has_clockevent;
};
-static DEFINE_RAW_SPINLOCK(sh_mtu2_lock);
-
#define TSTR -1 /* shared register */
#define TCR 0 /* channel register */
#define TMDR 1 /* channel register */
@@ -192,7 +192,7 @@ static void sh_mtu2_start_stop_ch(struct sh_mtu2_channel *ch, int start)
unsigned long flags, value;
/* start stop register shared by multiple timer channels */
- raw_spin_lock_irqsave(&sh_mtu2_lock, flags);
+ raw_spin_lock_irqsave(&ch->mtu->lock, flags);
value = sh_mtu2_read(ch, TSTR);
if (start)
@@ -201,7 +201,7 @@ static void sh_mtu2_start_stop_ch(struct sh_mtu2_channel *ch, int start)
value &= ~(1 << ch->index);
sh_mtu2_write(ch, TSTR, value);
- raw_spin_unlock_irqrestore(&sh_mtu2_lock, flags);
+ raw_spin_unlock_irqrestore(&ch->mtu->lock, flags);
}
static int sh_mtu2_enable(struct sh_mtu2_channel *ch)
@@ -402,6 +402,8 @@ static int sh_mtu2_setup(struct sh_mtu2_device *mtu,
mtu->pdev = pdev;
+ raw_spin_lock_init(&mtu->lock);
+
/* Get hold of clock. */
mtu->clk = clk_get(&mtu->pdev->dev, "fck");
if (IS_ERR(mtu->clk)) {
--
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