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backlight:fix hdmi switch black screen

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This commit is contained in:
yzq
2013-01-24 22:11:57 +08:00
committed by wuhao
parent 7f19cea18b
commit c740fecdce
1 changed files with 8 additions and 0 deletions
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8
drivers/video/backlight/rk29_backlight.c
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@@ -142,9 +142,17 @@ static int rk29_bl_update_status(struct backlight_device *bl)
rk29_bl_info->pwm_resume();
clk_enable(pwm_clk);
msleep(1);
div_total = read_pwm_reg(PWM_REG_LRC);
if (ref) {
divh = div_total*brightness/BL_STEP;
} else {
divh = div_total*(BL_STEP-brightness)/BL_STEP;
}
rk_pwm_setup(id, PWM_DIV, divh, div_total);
}
DBG("%s:line=%d,brightness = %d, div_total = %d, divh = %d state=%x \n",__FUNCTION__,__LINE__,brightness, div_total, divh,bl->props.state);
out:
mutex_unlock(&backlight_mutex);