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FB: sa11x0: fix shannon GPSR/GPCR accesses 

The GPIO set and clear registers should only be written, rather than
read, modified, and written.  A read-modify-write will have undesired
side effects.

Acked-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2012-01-18 13:47:14 +00:00
parent 058502eb38
commit 9bb13eed37
1 changed files with 2 additions and 2 deletions
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4
drivers/video/sa1100fb.c
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@ -798,7 +798,7 @@ static void sa1100fb_enable_controller(struct sa1100fb_info *fbi)
if (machine_is_shannon()) {
GPDR |= SHANNON_GPIO_DISP_EN;
GPSR |= SHANNON_GPIO_DISP_EN;
GPSR = SHANNON_GPIO_DISP_EN;
}
dev_dbg(fbi->dev, "DBAR1 = 0x%08lx\n", DBAR1);
@ -816,7 +816,7 @@ static void sa1100fb_disable_controller(struct sa1100fb_info *fbi)
dev_dbg(fbi->dev, "Disabling LCD controller\n");
if (machine_is_shannon()) {
GPCR |= SHANNON_GPIO_DISP_EN;
GPCR = SHANNON_GPIO_DISP_EN;
}
set_current_state(TASK_UNINTERRUPTIBLE);