diff options
| author | Andreas Bießmann <biessmann@corscience.de> | 2011-02-11 16:19:43 +0100 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2011-03-22 08:23:44 +0100 |
| commit | 7cdcdb69bdf51192bcbfb7cf479850fe7c33357d (patch) | |
| tree | 03a1743101c30ea5ee7e793812b0cd58748ec5e6 /drivers/video/atmel_lcdfb.c | |
| parent | video: s3c-fb: return proper error if clk_get fails (diff) | |
| download | linux-7cdcdb69bdf51192bcbfb7cf479850fe7c33357d.tar.xz linux-7cdcdb69bdf51192bcbfb7cf479850fe7c33357d.zip | |
atmel_lcdfb: implement inverted contrast pwm
This patch introduces lcdc->lcdcon_pol_negative which set CONTRAST_CTR
register to inverted polarity.
Signed-off-by: Andreas Bießmann <biessmann@corscience.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/video/atmel_lcdfb.c')
| -rw-r--r-- | drivers/video/atmel_lcdfb.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c index bac163450216..16da8af7425c 100644 --- a/drivers/video/atmel_lcdfb.c +++ b/drivers/video/atmel_lcdfb.c @@ -68,7 +68,7 @@ static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo, } #endif -static const u32 contrast_ctr = ATMEL_LCDC_PS_DIV8 +static u32 contrast_ctr = ATMEL_LCDC_PS_DIV8 | ATMEL_LCDC_POL_POSITIVE | ATMEL_LCDC_ENA_PWMENABLE; @@ -163,6 +163,10 @@ static void exit_backlight(struct atmel_lcdfb_info *sinfo) static void init_contrast(struct atmel_lcdfb_info *sinfo) { + /* contrast pwm can be 'inverted' */ + if (sinfo->lcdcon_pol_negative) + contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE); + /* have some default contrast/backlight settings */ lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr); lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT); @@ -816,6 +820,7 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev) sinfo->guard_time = pdata_sinfo->guard_time; sinfo->smem_len = pdata_sinfo->smem_len; sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight; + sinfo->lcdcon_pol_negative = pdata_sinfo->lcdcon_pol_negative; sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode; } else { dev_err(dev, "cannot get default configuration\n"); |