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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 <wellsk40@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-08-17 22:13:22 +01:00
parent 41e2e8fd34
commit 99c796df94
2 changed files with 9 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/video/amba-clcd.c
View File

@ -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..

1
include/linux/amba/clcd.h
View File

@ -150,6 +150,7 @@ struct clcd_fb {
u16 off_cntl;
u32 clcd_cntl;
u32 cmap[16];
bool clk_enabled;
};
static inline void clcdfb_decode(struct clcd_fb *fb, struct clcd_regs *regs)