video: da8xx-fb: preserve display width when changing HSYNC

When looking at this driver for a client, I noticed the code that
configures the HSYNC pulse clobbers the display width in the same
register.  It only preserves the MS part of the width in bit 3 and zeros
the LS part of the width in bits 9 to 4.  This doesn't matter during
initialization as the width is configured afterwards, but subsequent use
of the FBIPUT_HSYNC ioctl would clobber the width.

Preserve bits 9 to 0 of LCD_RASTER_TIMING_0_REG when configuring the
horizontal sync.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/drivers/video/fbdev/da8xx-fb.c b/drivers/video/fbdev/da8xx-fb.c
index 788f6b3..10c876c 100644 (file)
--- a/drivers/video/fbdev/da8xx-fb.c
+++ b/drivers/video/fbdev/da8xx-fb.c
@@ -419,7 +419,7 @@ static void lcd_cfg_horizontal_sync(int back_porch, int pulse_width,
 {
        u32 reg;
 
-       reg = lcdc_read(LCD_RASTER_TIMING_0_REG) & 0xf;
+       reg = lcdc_read(LCD_RASTER_TIMING_0_REG) & 0x3ff;
        reg |= (((back_porch-1) & 0xff) << 24)
            | (((front_porch-1) & 0xff) << 16)
            | (((pulse_width-1) & 0x3f) << 10);