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VIDEO: amba clcd: don't disable an already disabled clock

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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 <[email protected]>
Signed-off-by: Russell King <[email protected]>
This commit is contained in:
Russell King 2010-08-17 22:13:22 +01:00
commit 99c796df94
2 changed files with 9 additions and 2 deletions
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10
drivers/video/amba-clcd.c
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@ -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..