linux-kernel - [PATCH] fixed clock setting for Samsung SoC Framebuffer.

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Date:	Thu, 2 Jul 2009 18:58:14 +0900
From:	InKi Dae <daeinki@...il.com>
To:	linux-fbdev-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Cc:	Kyungmin Park <kmpark@...radead.org>
Subject: [PATCH] fixed clock setting for Samsung SoC Framebuffer.

This patch corrects CLKVAL_F field value of VIDEO MAIN CONTROLLER 0 REGITSTER.

Frame Rate is 1 / [ { (VSPW+1) + (VBPD+1) + (LIINEVAL + 1) + (VFPD+1)
} x {(HSPW+1) + (HBPD +1)
+ (HFPD+1) + (HOZVAL + 1) } x { ( CLKVAL+1 ) / ( Frequency of Clock
source ) } ] and VCLK = Video Clock Source / (CLKVAL +1).

therefore CLKVAL_F should be "CLKVAL_F = Frequency of Clock source /
pixel clock * refresh".

for this, I added refresh value in platform data like below.
static struct s3c_fb_pd_win xxx_fb_win0 = {
	/* this is to ensure we use win0 */
	.win_mode = {
		.refresh	= 60,
		.pixclock	= (66+4+2+480)*(15+5+3+800),
		.left_margin	= 66,
		.right_margin	= 2,
		.upper_margin	= 15,
		.lower_margin	= 3,
		.hsync_len	= 4,
		.vsync_len	= 5,
		.xres		= 480,
		.yres		= 800,
	},
	.max_bpp	= 32,
	.default_bpp	= 24,
};

static struct s3c_fb_platdata xxx_lcd_pdata __initdata = {
	.win[0]		= &xxx_fb_win0,
	.vidcon0	= VIDCON0_VIDOUT_RGB | VIDCON0_PNRMODE_RGB,
	.vidcon1	= VIDCON1_INV_HSYNC | VIDCON1_INV_VSYNC
			| VIDCON1_INV_VCLK | VIDCON1_INV_VDEN,
	.setup_gpio	= s5pc1xx_fb_gpio_setup_24bpp,
};

xxx_machine_init()
{
                   .
                   .
                   .
               s3c_fb_set_platdata(&xxx_lcd_pdata);
}

platform data defined in machine code should be setting using
s3c_fb_set_platdata().

I have tested this patch on boards based on s3c6410 and s5pc100 and worked fine.
I attached the patch for s3c-fb.c file.

thanks.

signed-by-off : InKi Dae. <inki.dae@...sung.com>

Download attachment "lcd.patch" of type "application/octet-stream" (1935 bytes)