[RFC PATCH 04/34] msm: clock: Support one lock per clock

[David Brown]

From: Stephen Boyd <sb...@codeaurora.org>

Signed-off-by: Stephen Boyd <sb...@codeaurora.org>
Signed-off-by: David Brown <dav...@codeaurora.org>
---
 arch/arm/mach-msm/clock.c |   19 +++++++++++--------
 arch/arm/mach-msm/clock.h |    2 ++
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/arch/arm/mach-msm/clock.c b/arch/arm/mach-msm/clock.c
index a9dabde..aa4a450 100644
--- a/arch/arm/mach-msm/clock.c
+++ b/arch/arm/mach-msm/clock.c
@@ -26,19 +26,17 @@
 
 #include "clock.h"
 
-static DEFINE_SPINLOCK(clocks_lock);
-
 /*
  * Standard clock functions defined in include/linux/clk.h
  */
 int clk_enable(struct clk *clk)
 {
        unsigned long flags;
-       spin_lock_irqsave(&clocks_lock, flags);
+       spin_lock_irqsave(&clk->lock, flags);
        clk->count++;
        if (clk->count == 1)
                clk->ops->enable(clk);
-       spin_unlock_irqrestore(&clocks_lock, flags);
+       spin_unlock_irqrestore(&clk->lock, flags);
        return 0;
 }
 EXPORT_SYMBOL(clk_enable);
@@ -46,12 +44,12 @@ EXPORT_SYMBOL(clk_enable);
 void clk_disable(struct clk *clk)
 {
        unsigned long flags;
-       spin_lock_irqsave(&clocks_lock, flags);
+       spin_lock_irqsave(&clk->lock, flags);
        BUG_ON(clk->count == 0);
        clk->count--;
        if (clk->count == 0)
                clk->ops->disable(clk);
-       spin_unlock_irqrestore(&clocks_lock, flags);
+       spin_unlock_irqrestore(&clk->lock, flags);
 }
 EXPORT_SYMBOL(clk_disable);
 
@@ -137,8 +135,13 @@ static unsigned msm_num_clocks;
 
 void __init msm_clock_init(struct clk_lookup *clock_tbl, size_t num_clocks)
 {
+       unsigned n;
+
        clkdev_add_table(clock_tbl, num_clocks);
 
+       for (n = 0; n < num_clocks; n++)
+               spin_lock_init(&clock_tbl[n].clk->lock);
+
        ebi1_clk = clk_get(NULL, "ebi1_clk");
        BUG_ON(ebi1_clk == NULL);
 
@@ -161,12 +164,12 @@ static int __init clock_late_init(void)
 
                clock_debug_add(clk);
                if (clk->flags & CLKFLAG_AUTO_OFF) {
-                       spin_lock_irqsave(&clocks_lock, flags);
+                       spin_lock_irqsave(&clk->lock, flags);
                        if (!clk->count) {
                                count++;
                                clk->ops->auto_off(clk);
                        }
-                       spin_unlock_irqrestore(&clocks_lock, flags);
+                       spin_unlock_irqrestore(&clk->lock, flags);
                }
        }
        pr_info("clock_late_init() disabled %d unused clocks\n", count);
diff --git a/arch/arm/mach-msm/clock.h b/arch/arm/mach-msm/clock.h
index 7fe1598..89506a8 100644
--- a/arch/arm/mach-msm/clock.h
+++ b/arch/arm/mach-msm/clock.h
@@ -19,6 +19,7 @@
 
 #include <linux/init.h>
 #include <linux/list.h>
+#include <linux/spinlock.h>
 #include <mach/clk.h>
 
 #define CLKFLAG_INVERT                 0x00000001
@@ -53,6 +54,7 @@ struct clk {
        uint32_t flags;
        struct clk_ops *ops;
        const char *dbg_name;
+       spinlock_t lock;
 };
 
 #define OFF CLKFLAG_AUTO_OFF
-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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