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gma500@ Fix backlight range error 

If we go out of range we break the pm counts on the error path

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2011-07-15 17:35:12 +01:00 committed by Greg Kroah-Hartman
parent f642062fc7
commit 83c871ee2b
1 changed files with 5 additions and 7 deletions
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12
drivers/staging/gma500/mrst_device.c
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@ -157,14 +157,12 @@ static int device_backlight_init(struct drm_device *dev)
value /= bl_max_freq;
value /= blc_pwm_precision_factor;
if (value > (unsigned long long)MRST_BLC_MAX_PWM_REG_FREQ)
return -ERANGE;
if (gma_power_begin(dev, false)) {
if (value > (unsigned long long)MRST_BLC_MAX_PWM_REG_FREQ)
return -ERANGE;
else {
REG_WRITE(BLC_PWM_CTL2,
(0x80000000 | REG_READ(BLC_PWM_CTL2)));
REG_WRITE(BLC_PWM_CTL, value | (value << 16));
}
REG_WRITE(BLC_PWM_CTL2, (0x80000000 | REG_READ(BLC_PWM_CTL2)));
REG_WRITE(BLC_PWM_CTL, value | (value << 16));
gma_power_end(dev);
}
return 0;