atmel_lcd: Allow contrast polarity to be either positive or negative

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>

diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c
index db86763..c02ffd8 100644 (file)
--- a/drivers/video/atmel_lcdfb.c
+++ b/drivers/video/atmel_lcdfb.c
@@ -143,8 +143,9 @@ void lcd_ctrl_init(void *lcdbase)
 
        /* Set contrast */
        value = ATMEL_LCDC_PS_DIV8 |
-               ATMEL_LCDC_POL_POSITIVE |
                ATMEL_LCDC_ENA_PWMENABLE;
+       if (!panel_info.vl_cont_pol_low)
+               value |= ATMEL_LCDC_POL_POSITIVE;
        lcdc_writel(panel_info.mmio, ATMEL_LCDC_CONTRAST_CTR, value);
        lcdc_writel(panel_info.mmio, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 

diff --git a/include/lcd.h b/include/lcd.h
index cd9d49d..0e098d9 100644 (file)
--- a/include/lcd.h
+++ b/include/lcd.h
@@ -167,6 +167,7 @@ typedef struct vidinfo {
        u_long vl_sync;         /* Horizontal / vertical sync */
        u_long vl_bpix;         /* Bits per pixel, 0 = 1, 1 = 2, 2 = 4, 3 = 8, 4 = 16 */
        u_long vl_tft;          /* 0 = passive, 1 = TFT */
+       u_long vl_cont_pol_low; /* contrast polarity is low */
 
        /* Horizontal control register. */
        u_long vl_hsync_len;    /* Length of horizontal sync */