video: da8xx-fb: support lcdc v2 timing register expansion

TI LCD controller version 2 adds some extra bits in a register to
increase the available size to represent horizontal timings. This
patch allows the fbdev driver to utilize those extra bits.
This will become important for driving an HDMI encoder from the lcd
controller where some of the VESA/CEA modes require quite large porches.

Signed-off-by: Darren Etheridge <detheridge@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
index 7dfa7a70fcfe211d24f7817eff4c85b2c46c58b6..9a05ccbd46c4de1c61dd2ed8341fb94068956f89 100644 (file)
--- a/drivers/video/da8xx-fb.c
+++ b/drivers/video/da8xx-fb.c
@@ -411,6 +411,21 @@ static void lcd_cfg_horizontal_sync(int back_porch, int pulse_width,
            | (((front_porch-1) & 0xff) << 16)
            | (((pulse_width-1) & 0x3f) << 10);
        lcdc_write(reg, LCD_RASTER_TIMING_0_REG);
+
+       /*
+        * LCDC Version 2 adds some extra bits that increase the allowable
+        * size of the horizontal timing registers.
+        * remember that the registers use 0 to represent 1 so all values
+        * that get set into register need to be decremented by 1
+        */
+       if (lcd_revision == LCD_VERSION_2) {
+               /* Mask off the bits we want to change */
+               reg = lcdc_read(LCD_RASTER_TIMING_2_REG) & ~0x780000ff;
+               reg |= ((front_porch-1) & 0x300) >> 8;
+               reg |= ((back_porch-1) & 0x300) >> 4;
+               reg |= ((pulse_width-1) & 0x3c0) << 21;
+               lcdc_write(reg, LCD_RASTER_TIMING_2_REG);
+       }
 }
 
 static void lcd_cfg_vertical_sync(int back_porch, int pulse_width,