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authorRussell King <rmk+kernel@arm.linux.org.uk>2010-08-17 22:13:22 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-08-17 22:15:09 +0100
commit99c796df94afca5256860dd4760017f1dbb3480c (patch)
tree73347ec30626e2ebdf95f64d1cd195b11baa794e /drivers/video/amba-clcd.c
parent41e2e8fd34fff909a0e40129f6ac4233ecfa67a9 (diff)
downloadblackbird-op-linux-99c796df94afca5256860dd4760017f1dbb3480c.tar.gz
blackbird-op-linux-99c796df94afca5256860dd4760017f1dbb3480c.zip
VIDEO: amba clcd: don't disable an already disabled clock
Fix the clock enable/disable tracking in the AMBA CLCD driver so that the driver doesn't try to disable an already disabled clock, thereby causing the clock (if shared) to become unbalanced. This resolves a problem with CLCD on LPC32xx ARM platforms. Reported-by: Kevin Wells <wellsk40@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/video/amba-clcd.c')
-rw-r--r--drivers/video/amba-clcd.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/video/amba-clcd.c b/drivers/video/amba-clcd.c
index afe21e6eb544..1c2c68356ea7 100644
--- a/drivers/video/amba-clcd.c
+++ b/drivers/video/amba-clcd.c
@@ -80,7 +80,10 @@ static void clcdfb_disable(struct clcd_fb *fb)
/*
* Disable CLCD clock source.
*/
- clk_disable(fb->clk);
+ if (fb->clk_enabled) {
+ fb->clk_enabled = false;
+ clk_disable(fb->clk);
+ }
}
static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
@@ -88,7 +91,10 @@ static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
/*
* Enable the CLCD clock source.
*/
- clk_enable(fb->clk);
+ if (!fb->clk_enabled) {
+ fb->clk_enabled = true;
+ clk_enable(fb->clk);
+ }
/*
* Bring up by first enabling..
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