Samsung SoC Framebuffer driver: add Alpha Channel support

Add support for the ARGB1888 and ARGB4888 hardware to the Samsung SoC
Framebuffer driver (s3c-fb.c).

ARGB1888 and ARGB4888 is decided by var->transp.length and this variable
is set by s3c_fb_check_var().

In s3c_fb_check_var(), if var->vits_per_pixel is 25 or 28, then
var->transp.length would be 1 or 3.

Therefore alpha mode(ARGB1888 or ARGB4888) could be decided through that
variable.

For using alpha mode, you need to set the following: This code should be
added to your machine code as platform data.

static struct s3c_fb_pd_win xxx_fb_win0 = {
	/* this is to ensure we use win0 */
	.win_mode = {
		.pixclock		= (8+8+8+240)*(38+4+38+400),
		.left_margin	= 8,
		.right_margin	= 8,
		.upper_margin	= 38,
		.lower_margin	= 38,
		.hsync_len		= 8,
		.vsync_len		= 4,
		.xres			= 240,
		.yres			= 400,
	},
	.max_bpp		= 32,
	.default_bpp	= 24,
};

static struct s3c_fb_pd_win xxx_fb_win1 = {
	.win_mode = {
		.pixclock		= (8+8+8+240)*(38+4+38+400),
		.left_margin	= 8,
		.right_margin	= 8,
		.upper_margin	= 38,
		.lower_margin	= 38,
		.hsync_len		= 8,
		.vsync_len		= 4,
		.xres			= 240,
		.yres			= 400,
	},
	.max_bpp		= 32,
	.default_bpp	= 28,
};

static struct s3c_fb_platdata xxx_lcd_pdata __initdata = {
	.win[0]		= &ncp_fb_win0,
	.win[1]		= &ncp_fb_win1,
	.vidcon0	= VIDCON0_VIDOUT_RGB | VIDCON0_PNRMODE_RGB,
	.vidcon1	= VIDCON1_INV_HSYNC | VIDCON1_INV_VSYNC,
	.setup_gpio	= xxx_fb_gpio_setup,
};

s3c_fb_set_platdata(&xxx_lcd_pdata);

The above code sets pixelformat for window0 layer to RGB888 and window1
layer to ARGB4888.

Signed-off-by: InKi Dae <inki.dae@samsung.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Kyungmin Park <kmpark@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c
index d3a568e..53bca28 100644 (file)
--- a/drivers/video/s3c-fb.c
+++ b/drivers/video/s3c-fb.c
@@ -358,9 +358,16 @@ static int s3c_fb_set_par(struct fb_info *info)
        writel(data, regs + VIDOSD_B(win_no));
 
        data = var->xres * var->yres;
+
+       u32 osdc_data = 0;
+
+       osdc_data = VIDISD14C_ALPHA1_R(0xf) |
+               VIDISD14C_ALPHA1_G(0xf) |
+               VIDISD14C_ALPHA1_B(0xf);
+
        if (s3c_fb_has_osd_d(win_no)) {
                writel(data, regs + VIDOSD_D(win_no));
-               writel(0, regs + VIDOSD_C(win_no));
+               writel(osdc_data, regs + VIDOSD_C(win_no));
        } else
                writel(data, regs + VIDOSD_C(win_no));
 
@@ -409,8 +416,12 @@ static int s3c_fb_set_par(struct fb_info *info)
                                data |= WINCON1_BPPMODE_19BPP_A1666;
                        else
                                data |= WINCON1_BPPMODE_18BPP_666;
-               } else if (var->transp.length != 0)
-                       data |= WINCON1_BPPMODE_25BPP_A1888;
+               } else if (var->transp.length == 1)
+                       data |= WINCON1_BPPMODE_25BPP_A1888
+                               | WINCON1_BLD_PIX;
+               else if (var->transp.length == 4)
+                       data |= WINCON1_BPPMODE_28BPP_A4888
+                               | WINCON1_BLD_PIX | WINCON1_ALPHA_SEL;
                else
                        data |= WINCON0_BPPMODE_24BPP_888;
 
@@ -418,6 +429,20 @@ static int s3c_fb_set_par(struct fb_info *info)
                break;
        }
 
+       /* It has no color key control register for window0 */
+       if (win_no > 0) {
+               u32 keycon0_data = 0, keycon1_data = 0;
+
+               keycon0_data = ~(WxKEYCON0_KEYBL_EN |
+                               WxKEYCON0_KEYEN_F |
+                               WxKEYCON0_DIRCON) | WxKEYCON0_COMPKEY(0);
+
+               keycon1_data = WxKEYCON1_COLVAL(0xffffff);
+
+               writel(keycon0_data, regs + WxKEYCONy(win_no-1, 0));
+               writel(keycon1_data, regs + WxKEYCONy(win_no-1, 1));
+       }
+
        writel(data, regs + WINCON(win_no));
        writel(0x0, regs + WINxMAP(win_no));