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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>
This commit is contained in:
Andreas Bießmann 2011-02-11 15:19:43 +00:00 committed by Paul Mundt
parent 942b8d05cd
commit 7cdcdb69bd
2 changed files with 7 additions and 1 deletions
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7
drivers/video/atmel_lcdfb.c
View File

@ -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");

1
include/video/atmel_lcdc.h
View File

@ -52,6 +52,7 @@ struct atmel_lcdfb_info {
u8 bl_power;
#endif
bool lcdcon_is_backlight;
bool lcdcon_pol_negative;
u8 saved_lcdcon;
u8 default_bpp;