[PATCH 2/2] atmel_lcdfb: Use proper blanking on negative contrast polarity
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STALE5385d
From: Alexander Stein <hidden>
Date: 2011-10-05 07:59:58
Also in:
linux-arm-kernel
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
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 <redacted> --- drivers/video/atmel_lcdfb.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c
index 816d528..2bd75b5 100644
--- a/drivers/video/atmel_lcdfb.c
+++ b/drivers/video/atmel_lcdfb.c@@ -96,8 +96,11 @@ 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;
--
1.7.3.4