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@xxxxxxxxxxx>
---
arch/arm/plat-samsung/include/plat/regs-fb.h | 6 ++++++
drivers/video/s3c-fb.c | 18 ++++++++++++++++++
2 files changed, 24 insertions(+), 0 deletions(-)
diff --git a/arch/arm/plat-samsung/include/plat/regs-fb.h b/arch/arm/plat-samsung/include/plat/regs-fb.h
index 8f39aa5..6bf68ed 100644
--- a/arch/arm/plat-samsung/include/plat/regs-fb.h
+++ b/arch/arm/plat-samsung/include/plat/regs-fb.h
@@ -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)
+
diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c
index 0c63b69..e92be55 100644
--- a/drivers/video/s3c-fb.c
+++ b/drivers/video/s3c-fb.c
@@ -81,6 +81,7 @@ 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 {
@@ -99,6 +100,7 @@ struct s3c_fb_variant {
unsigned int has_prtcon:1;
unsigned int has_shadowcon:1;
+ unsigned int has_blendcon:1;
unsigned int has_clksel:1;
};
@@ -692,6 +694,17 @@ 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);
@@ -1819,6 +1832,7 @@ 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],
@@ -1850,6 +1864,7 @@ 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],
@@ -1881,6 +1896,7 @@ 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],
@@ -1944,6 +1960,8 @@ 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],
--
1.7.1
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