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FB: sa1100: make GPIO configuration setting safe

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The sa1100fb driver needs to set the GPIO direction and alternate
function register according to the panel that we're driving.  We've
done this in the driver by read-modify-writing the register, which
may cause problems with races.  Fix this with a minimal change.

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 12:52:59 +00:00
parent ba5fd193f4
commit 058502eb38
1 changed files with 11 additions and 0 deletions
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11
drivers/video/sa1100fb.c
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@ -761,8 +761,19 @@ static void sa1100fb_setup_gpio(struct sa1100fb_info *fbi)
}
if (mask) {
unsigned long flags;
/*
* SA-1100 requires the GPIO direction register set
* appropriately for the alternate function. Hence
* we set it here via bitmask rather than excessive
* fiddling via the GPIO subsystem - and even then
* we'll still have to deal with GAFR.
*/
local_irq_save(flags);
GPDR |= mask;
GAFR |= mask;
local_irq_restore(flags);
}
}