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Commit 12fa8350 authored by Manjunathappa, Prakash's avatar Manjunathappa, Prakash Committed by Florian Tobias Schandinat
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video:da8xx-fb: calculate pixel clock period for the panel 



Patch calculates pixel clock period in pico seconds and updates
the same in variable screen information structure. fbset utility
uses this information.

Signed-off-by: default avatarManjunathappa, Prakash <prakash.pm@ti.com>
Signed-off-by: default avatarFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>
parent 3a84409c

drivers/video/da8xx-fb.c

+18 −1
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ 
#include <linux/console.h>

#include <linux/slab.h>

#include <video/da8xx-fb.h>

#include <asm/div64.h>



#define DRIVER_NAME "da8xx_lcdc"
@@ -175,7 +176,6 @@ static struct fb_var_screeninfo da8xx_fb_var __devinitdata = { 
	.activate = 0,

	.height = -1,

	.width = -1,

	.pixclock = 46666,	/* 46us - AUO display */

	.accel_flags = 0,

	.left_margin = LEFT_MARGIN,

	.right_margin = RIGHT_MARGIN,
@@ -1051,6 +1051,22 @@ static struct fb_ops da8xx_fb_ops = { 
	.fb_blank = cfb_blank,

};



/* Calculate and return pixel clock period in pico seconds */

static unsigned int da8xxfb_pixel_clk_period(struct da8xx_fb_par *par)

{

	unsigned int lcd_clk, div;

	unsigned int configured_pix_clk;

	unsigned long long pix_clk_period_picosec = 1000000000000ULL;



	lcd_clk = clk_get_rate(par->lcdc_clk);

	div = lcd_clk / par->pxl_clk;

	configured_pix_clk = (lcd_clk / div);



	do_div(pix_clk_period_picosec, configured_pix_clk);



	return pix_clk_period_picosec;

}



static int __devinit fb_probe(struct platform_device *device)

{

	struct da8xx_lcdc_platform_data *fb_pdata =
@@ -1215,6 +1231,7 @@ static int __devinit fb_probe(struct platform_device *device) 


	da8xx_fb_var.hsync_len = lcdc_info->hsw;

	da8xx_fb_var.vsync_len = lcdc_info->vsw;

	da8xx_fb_var.pixclock = da8xxfb_pixel_clk_period(par);



	/* Initialize fbinfo */

	da8xx_fb_info->flags = FBINFO_FLAG_DEFAULT;