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Subject[PATCH] amba-clcd: add RGB444 support
Date
This one adds RGB444 (bpp=12) support to amba clcd drivers. Tested on a lpc3250
based platform.

Signed-off-by: Luotao Fu <l.fu@pengutronix.de>
---
drivers/video/amba-clcd.c | 11 ++++++++---
include/linux/amba/clcd.h | 7 ++++++-
2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/video/amba-clcd.c b/drivers/video/amba-clcd.c
index a21efcd..5111a12 100644
--- a/drivers/video/amba-clcd.c
+++ b/drivers/video/amba-clcd.c
@@ -134,6 +134,11 @@ clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
var->blue.length = var->bits_per_pixel;
var->blue.offset = 0;
break;
+ case 12:
+ var->red.length = 4;
+ var->green.length = 4;
+ var->blue.length = 4;
+ break;
case 16:
var->red.length = 5;
var->blue.length = 5;
@@ -161,7 +166,7 @@ clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
* encoded in the pixel data. Calculate their position from
* the bitfield length defined above.
*/
- if (ret == 0 && var->bits_per_pixel >= 16) {
+ if (ret == 0 && var->bits_per_pixel >= 12) {
if (fb->panel->cntl & CNTL_BGR) {
var->blue.offset = 0;
var->green.offset = var->blue.offset + var->blue.length;
@@ -200,6 +205,8 @@ static int clcdfb_set_par(struct fb_info *info)
struct clcd_fb *fb = to_clcd(info);
struct clcd_regs regs;

+ fb->board->decode(fb, &regs);
+
fb->fb.fix.line_length = fb->fb.var.xres_virtual *
fb->fb.var.bits_per_pixel / 8;

@@ -208,8 +215,6 @@ static int clcdfb_set_par(struct fb_info *info)
else
fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;

- fb->board->decode(fb, &regs);
-
clcdfb_disable(fb);

writel(regs.tim0, fb->regs + CLCD_TIM0);
diff --git a/include/linux/amba/clcd.h b/include/linux/amba/clcd.h
index 8d0d491..7e0bcc7 100644
--- a/include/linux/amba/clcd.h
+++ b/include/linux/amba/clcd.h
@@ -53,6 +53,7 @@
#define CNTL_LCDBPP2 (1 << 1)
#define CNTL_LCDBPP4 (2 << 1)
#define CNTL_LCDBPP8 (3 << 1)
+#define CNTL_LCDBPP12 (7 << 1)
#define CNTL_LCDBPP16 (4 << 1)
#define CNTL_LCDBPP16_565 (6 << 1)
#define CNTL_LCDBPP24 (5 << 1)
@@ -209,6 +210,10 @@ static inline void clcdfb_decode(struct clcd_fb *fb, struct clcd_regs *regs)
case 8:
val |= CNTL_LCDBPP8;
break;
+ case 12:
+ fb->fb.var.bits_per_pixel = 16;
+ val |= CNTL_LCDBPP12;
+ break;
case 16:
/*
* PL110 cannot choose between 5551 and 565 modes in
@@ -225,7 +230,7 @@ static inline void clcdfb_decode(struct clcd_fb *fb, struct clcd_regs *regs)
val |= CNTL_LCDBPP24;
break;
}
-
+ printk("**** %s: cntl val 0x%08x\n", __func__, val);
regs->cntl = val;
regs->pixclock = fb->fb.var.pixclock;
}
--
1.7.0


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