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Commit 7cdcdb69 authored by Andreas Bießmann's avatar Andreas Bießmann Committed by Paul Mundt
Browse files

atmel_lcdfb: implement inverted contrast pwm 



This patch introduces lcdc->lcdcon_pol_negative which set CONTRAST_CTR
 register to inverted polarity.

Signed-off-by: default avatarAndreas Bießmann <biessmann@corscience.de>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 942b8d05

drivers/video/atmel_lcdfb.c

+6 −1
Original line number Diff line number Diff line
@@ -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");

include/video/atmel_lcdc.h

+1 −0
Original line number Diff line number Diff line
@@ -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;