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authorAlexander Stein <alexander.stein@systec-electronic.com>2011-10-05 09:59:58 +0200
committerFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>2011-11-11 16:50:55 +0000
commitacfdc2e1bdb4b148e7546fe8948d8f75bd2f9377 (patch)
tree558967596ab0d60d147b8c301b507c0fb4f0279d /drivers/video/atmel_lcdfb.c
parent5d910426a6e80194a50e33351c91abcad266c809 (diff)
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 <alexander.stein@systec-electronic.com> Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Diffstat (limited to 'drivers/video/atmel_lcdfb.c')
-rw-r--r--drivers/video/atmel_lcdfb.c5
1 files changed, 4 insertions, 1 deletions
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;