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| author | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2014-03-04 15:25:56 +0100 |
|---|---|---|
| committer | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2014-07-02 16:01:50 +0200 |
| commit | 8b2463d8cae2dda0c98ab5a15f25a0350a0e998d (patch) | |
| tree | 5c314dcdf601781735b00b03b2fbc381e282e1ce | |
| parent | 1a5da0e43be0c07462e445549dbdd4a1731a3e11 (diff) | |
| download | linux-stable-8b2463d8cae2dda0c98ab5a15f25a0350a0e998d.tar.gz linux-stable-8b2463d8cae2dda0c98ab5a15f25a0350a0e998d.tar.bz2 linux-stable-8b2463d8cae2dda0c98ab5a15f25a0350a0e998d.zip | |
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@ideasonboard.com>
Tested-by: Wolfram Sang <wsa@sang-engineering.com>
| -rw-r--r-- | drivers/clocksource/sh_mtu2.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c index 0342e4a01c9e..b0c229f4b4c6 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)) { |