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drivers/video/backlight/l4f00242t03.c: prevent unbalanced calls to regulator enable/disable

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Otherwise a double call to:
$ echo 4 > /sys/class/lcd/l4f00242t03/lcd_power
Will, the first power down the lcd and regulators correctly and the
second produce an unbalanced call to regulator disable.

Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alberto Panizzo 2011-01-12 16:59:23 -08:00 committed by Linus Torvalds
parent 95558ad15b
commit 26bbabc8e8
1 changed files with 6 additions and 4 deletions
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10
drivers/video/backlight/l4f00242t03.c
View file

@ -134,10 +134,12 @@ static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
}
} else {
/* power == FB_BLANK_POWERDOWN */
/* Clear the screen before shutting down */
spi_write(spi, (const u8 *)&disoff, sizeof(u16));
msleep(60);
l4f00242t03_lcd_powerdown(spi);
if (priv->lcd_state != FB_BLANK_POWERDOWN) {
/* Clear the screen before shutting down */
spi_write(spi, (const u8 *)&disoff, sizeof(u16));
msleep(60);
l4f00242t03_lcd_powerdown(spi);
}
}
priv->lcd_state = power;