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video: stm32: stm32_ltdc: set the blending factor

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Set the blending factor regarding the pixel format

Signed-off-by: yannick fertre <yannick.fertre@st.com>
This commit is contained in:
yannick fertre 2018-03-02 15:59:25 +01:00 committed by Anatolij Gustschin
parent 75fa711ac8
commit e6194ce612
1 changed files with 35 additions and 6 deletions
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41
drivers/video/stm32/stm32_ltdc.c
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@ -138,7 +138,9 @@ struct stm32_ltdc_priv {
#define LXCFBLNR_CFBLN GENMASK(10, 0) /* Color Frame Buffer Line Number */
#define BF1_PAXCA 0x600 /* Pixel Alpha x Constant Alpha */
#define BF1_CA 0x400 /* Constant Alpha */
#define BF2_1PAXCA 0x007 /* 1 - (Pixel Alpha x Constant Alpha) */
#define BF2_1CA 0x005 /* 1 - Constant Alpha */
enum stm32_ltdc_pix_fmt {
PF_ARGB8888 = 0,
@ -161,11 +163,17 @@ static u32 stm32_ltdc_get_pixel_format(enum video_log2_bpp l2bpp)
pf = PF_RGB565;
break;
case VIDEO_BPP32:
pf = PF_ARGB8888;
break;
case VIDEO_BPP8:
pf = PF_L8;
break;
case VIDEO_BPP1:
case VIDEO_BPP2:
case VIDEO_BPP4:
case VIDEO_BPP8:
case VIDEO_BPP32:
default:
debug("%s: warning %dbpp not supported yet, %dbpp instead\n",
__func__, VNBITS(l2bpp), VNBITS(VIDEO_BPP16));
@ -178,6 +186,23 @@ static u32 stm32_ltdc_get_pixel_format(enum video_log2_bpp l2bpp)
return (u32)pf;
}
static bool has_alpha(u32 fmt)
{
switch (fmt) {
case PF_ARGB8888:
case PF_ARGB1555:
case PF_ARGB4444:
case PF_AL44:
case PF_AL88:
return true;
case PF_RGB888:
case PF_RGB565:
case PF_L8:
default:
return false;
}
}
static void stm32_ltdc_enable(struct stm32_ltdc_priv *priv)
{
/* Reload configuration immediately & enable LTDC */
@ -247,6 +272,7 @@ static void stm32_ltdc_set_layer1(struct stm32_ltdc_priv *priv, ulong fb_addr)
u32 line_length;
u32 bus_width;
u32 val, tmp, bpp;
u32 format;
x0 = priv->crop_x;
x1 = priv->crop_x + priv->crop_w - 1;
@ -277,15 +303,18 @@ static void stm32_ltdc_set_layer1(struct stm32_ltdc_priv *priv, ulong fb_addr)
clrsetbits_le32(regs + LTDC_L1CFBLR, LXCFBLR_CFBLL | LXCFBLR_CFBP, val);
/* Pixel format */
val = stm32_ltdc_get_pixel_format(priv->l2bpp);
clrsetbits_le32(regs + LTDC_L1PFCR, LXPFCR_PF, val);
format = stm32_ltdc_get_pixel_format(priv->l2bpp);
clrsetbits_le32(regs + LTDC_L1PFCR, LXPFCR_PF, format);
/* Constant alpha value */
clrsetbits_le32(regs + LTDC_L1CACR, LXCACR_CONSTA, priv->alpha);
/* Specifies the blending factors : with or without pixel alpha */
/* Manage hw-specific capabilities */
val = has_alpha(format) ? BF1_PAXCA | BF2_1PAXCA : BF1_CA | BF2_1CA;
/* Blending factors */
clrsetbits_le32(regs + LTDC_L1BFCR, LXBFCR_BF2 | LXBFCR_BF1,
BF1_PAXCA | BF2_1PAXCA);
clrsetbits_le32(regs + LTDC_L1BFCR, LXBFCR_BF2 | LXBFCR_BF1, val);
/* Frame buffer line number */
clrsetbits_le32(regs + LTDC_L1CFBLNR, LXCFBLNR_CFBLN, priv->crop_h);