linux-kernel - [PATCH] amba-clcd: add RGB444 support

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Date:	Mon, 15 Mar 2010 14:30:09 +0100
From:	Luotao Fu <l.fu@...gutronix.de>
To:	Russell King <linux@....linux.org.uk>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andres Salomon <dilinger@...ian.org>,
	Alessandro Rubini <rubini@...pv.it>,
	Krzysztof Helt <krzysztof.h1@...pl>,
	Kevin Wells <wellsk40@...il.com>, linux-kernel@...r.kernel.org,
	Luotao Fu <l.fu@...gutronix.de>
Subject: [PATCH] amba-clcd: add RGB444 support

This one adds RGB444 (bpp=12) support to amba clcd drivers. Tested on a lpc3250
based platform.

Signed-off-by: Luotao Fu <l.fu@...gutronix.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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