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video:da8xx-fb: calculate pixel clock period for the panel

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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: Manjunathappa, Prakash <prakash.pm@ti.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
This commit is contained in:
Manjunathappa, Prakash 2012-02-09 11:54:06 +05:30 committed by Florian Tobias Schandinat
parent 3a84409ce3
commit 12fa835024
1 changed files with 18 additions and 1 deletions
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19
drivers/video/da8xx-fb.c
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@ -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;