lkml.org 
[lkml]   [2011]   [Nov]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC PATCH 08/34] msm: clock: Enable/disable parent clocks generically
Date
From: Stephen Boyd <sboyd@codeaurora.org>

Enable the parent clocks whenever a clock is enabled and disable
a parent clock whenever a clock is disabled. This simplifies
sub-driver code by centralizing the parent enabling in the
top-level.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
---
arch/arm/mach-msm/clock.c | 33 +++++++++++++++++++++++++++++----
1 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mach-msm/clock.c b/arch/arm/mach-msm/clock.c
index 8508c17..026bdc0 100644
--- a/arch/arm/mach-msm/clock.c
+++ b/arch/arm/mach-msm/clock.c
@@ -31,24 +31,49 @@
*/
int clk_enable(struct clk *clk)
{
+ int ret = 0;
unsigned long flags;
+ struct clk *parent;
+
+ if (!clk)
+ return 0;
+
spin_lock_irqsave(&clk->lock, flags);
+ if (clk->count == 0) {
+ parent = clk_get_parent(clk);
+ ret = clk_enable(parent);
+ if (ret)
+ goto out;
+
+ ret = clk->ops->enable(clk);
+ if (ret) {
+ clk_disable(parent);
+ goto out;
+ }
+ }
clk->count++;
- if (clk->count == 1)
- clk->ops->enable(clk);
+out:
spin_unlock_irqrestore(&clk->lock, flags);
- return 0;
+ return ret;
}
EXPORT_SYMBOL(clk_enable);

void clk_disable(struct clk *clk)
{
unsigned long flags;
+ struct clk *parent;
+
+ if (!clk)
+ return;
+
spin_lock_irqsave(&clk->lock, flags);
BUG_ON(clk->count == 0);
clk->count--;
- if (clk->count == 0)
+ if (clk->count == 0) {
clk->ops->disable(clk);
+ parent = clk_get_parent(clk);
+ clk_disable(parent);
+ }
spin_unlock_irqrestore(&clk->lock, flags);
}
EXPORT_SYMBOL(clk_disable);
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.


\
 
 \ /
  Last update: 2011-11-02 19:45    [W:0.118 / U:12.488 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site