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video: s3c-fb: add alpha value width setting 

This patch adds alpha value width setting according to
transparency value of each window format, using BLENDCON
register. When alpha value is 8 bits, BLENDCON will set
alpha value width as 8 bits.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
This commit is contained in:
Jingoo Han 2012-01-27 14:47:22 +09:00 committed by Florian Tobias Schandinat
parent 05e52b4bfb
commit f7f31e505a
2 changed files with 24 additions and 0 deletions
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6
arch/arm/plat-samsung/include/plat/regs-fb.h
View File

@ -384,3 +384,9 @@
#define WPALCON_W0PAL_16BPP_A555 (0x5 << 0)
#define WPALCON_W0PAL_16BPP_565 (0x6 << 0)
/* Blending equation control */
#define BLENDCON (0x260)
#define BLENDCON_NEW_MASK (1 << 0)
#define BLENDCON_NEW_8BIT_ALPHA_VALUE (1 << 0)
#define BLENDCON_NEW_4BIT_ALPHA_VALUE (0 << 0)

18
drivers/video/s3c-fb.c
View File

@ -82,6 +82,7 @@ struct s3c_fb;
* @palette: Address of palette memory, or 0 if none.
* @has_prtcon: Set if has PRTCON register.
* @has_shadowcon: Set if has SHADOWCON register.
* @has_blendcon: Set if has BLENDCON register.
* @has_clksel: Set if VIDCON0 register has CLKSEL bit.
*/
struct s3c_fb_variant {
@ -100,6 +101,7 @@ struct s3c_fb_variant {
unsigned int has_prtcon:1;
unsigned int has_shadowcon:1;
unsigned int has_blendcon:1;
unsigned int has_clksel:1;
};
@ -691,6 +693,17 @@ static int s3c_fb_set_par(struct fb_info *info)
writel(data, regs + sfb->variant.wincon + (win_no * 4));
writel(0x0, regs + sfb->variant.winmap + (win_no * 4));
/* Set alpha value width */
if (sfb->variant.has_blendcon) {
data = readl(sfb->regs + BLENDCON);
data &= ~BLENDCON_NEW_MASK;
if (var->transp.length > 4)
data |= BLENDCON_NEW_8BIT_ALPHA_VALUE;
else
data |= BLENDCON_NEW_4BIT_ALPHA_VALUE;
writel(data, sfb->regs + BLENDCON);
}
shadow_protect_win(win, 0);
pm_runtime_put_sync(sfb->dev);
@ -1798,6 +1811,7 @@ static struct s3c_fb_driverdata s3c_fb_data_s5pc100 = {
},
.has_prtcon = 1,
.has_blendcon = 1,
.has_clksel = 1,
},
.win[0] = &s3c_fb_data_s5p_wins[0],
@ -1829,6 +1843,7 @@ static struct s3c_fb_driverdata s3c_fb_data_s5pv210 = {
},
.has_shadowcon = 1,
.has_blendcon = 1,
.has_clksel = 1,
},
.win[0] = &s3c_fb_data_s5p_wins[0],
@ -1860,6 +1875,7 @@ static struct s3c_fb_driverdata s3c_fb_data_exynos4 = {
},
.has_shadowcon = 1,
.has_blendcon = 1,
},
.win[0] = &s3c_fb_data_s5p_wins[0],
.win[1] = &s3c_fb_data_s5p_wins[1],
@ -1923,6 +1939,8 @@ static struct s3c_fb_driverdata s3c_fb_data_s5p64x0 = {
[1] = 0x2800,
[2] = 0x2c00,
},
.has_blendcon = 1,
},
.win[0] = &s3c_fb_data_s5p_wins[0],
.win[1] = &s3c_fb_data_s5p_wins[1],