From: Alexander Stein Date: Wed, 5 Oct 2011 07:59:58 +0000 (+0200) Subject: atmel_lcdfb: Use proper blanking on negative contrast polarity X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=acfdc2e1bdb4b148e7546fe8948d8f75bd2f9377;p=mv-sheeva.git atmel_lcdfb: Use proper blanking on negative contrast polarity If used with negative polarity the PWM unit cannot be disabled. This would result in a full contrast screen. Instead let the PWM unit enabled using 0x0 as compare value which darkens the display. In result no power saving is possible if inverted contrast polarity is used. Signed-off-by: Alexander Stein Signed-off-by: Florian Tobias Schandinat --- diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c index 7e66263b18c..8bfee6aecc8 100644 --- a/drivers/video/atmel_lcdfb.c +++ b/drivers/video/atmel_lcdfb.c @@ -99,8 +99,11 @@ static int atmel_bl_update_status(struct backlight_device *bl) brightness = 0; lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness); - lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, + if (contrast_ctr & ATMEL_LCDC_POL_POSITIVE) + lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, brightness ? contrast_ctr : 0); + else + lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr); bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;