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>
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@ -384,3 +384,9 @@
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#define WPALCON_W0PAL_16BPP_A555 (0x5 << 0)
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#define WPALCON_W0PAL_16BPP_565 (0x6 << 0)
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/* Blending equation control */
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#define BLENDCON (0x260)
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#define BLENDCON_NEW_MASK (1 << 0)
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#define BLENDCON_NEW_8BIT_ALPHA_VALUE (1 << 0)
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#define BLENDCON_NEW_4BIT_ALPHA_VALUE (0 << 0)
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@ -82,6 +82,7 @@ struct s3c_fb;
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* @palette: Address of palette memory, or 0 if none.
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* @has_prtcon: Set if has PRTCON register.
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* @has_shadowcon: Set if has SHADOWCON register.
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* @has_blendcon: Set if has BLENDCON register.
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* @has_clksel: Set if VIDCON0 register has CLKSEL bit.
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*/
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struct s3c_fb_variant {
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@ -100,6 +101,7 @@ struct s3c_fb_variant {
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unsigned int has_prtcon:1;
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unsigned int has_shadowcon:1;
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unsigned int has_blendcon:1;
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unsigned int has_clksel:1;
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};
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@ -691,6 +693,17 @@ static int s3c_fb_set_par(struct fb_info *info)
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writel(data, regs + sfb->variant.wincon + (win_no * 4));
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writel(0x0, regs + sfb->variant.winmap + (win_no * 4));
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/* Set alpha value width */
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if (sfb->variant.has_blendcon) {
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data = readl(sfb->regs + BLENDCON);
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data &= ~BLENDCON_NEW_MASK;
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if (var->transp.length > 4)
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data |= BLENDCON_NEW_8BIT_ALPHA_VALUE;
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else
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data |= BLENDCON_NEW_4BIT_ALPHA_VALUE;
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writel(data, sfb->regs + BLENDCON);
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}
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shadow_protect_win(win, 0);
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pm_runtime_put_sync(sfb->dev);
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@ -1798,6 +1811,7 @@ static struct s3c_fb_driverdata s3c_fb_data_s5pc100 = {
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},
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.has_prtcon = 1,
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.has_blendcon = 1,
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.has_clksel = 1,
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},
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.win[0] = &s3c_fb_data_s5p_wins[0],
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@ -1829,6 +1843,7 @@ static struct s3c_fb_driverdata s3c_fb_data_s5pv210 = {
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},
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.has_shadowcon = 1,
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.has_blendcon = 1,
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.has_clksel = 1,
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},
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.win[0] = &s3c_fb_data_s5p_wins[0],
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@ -1860,6 +1875,7 @@ static struct s3c_fb_driverdata s3c_fb_data_exynos4 = {
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},
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.has_shadowcon = 1,
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.has_blendcon = 1,
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},
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.win[0] = &s3c_fb_data_s5p_wins[0],
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.win[1] = &s3c_fb_data_s5p_wins[1],
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@ -1923,6 +1939,8 @@ static struct s3c_fb_driverdata s3c_fb_data_s5p64x0 = {
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[1] = 0x2800,
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[2] = 0x2c00,
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},
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.has_blendcon = 1,
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},
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.win[0] = &s3c_fb_data_s5p_wins[0],
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.win[1] = &s3c_fb_data_s5p_wins[1],
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