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: Manjunathappa, Prakash <prakash.pm@ti.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
index 720cb83..dd80386 100644 (file)
--- a/drivers/video/da8xx-fb.c
+++ b/drivers/video/da8xx-fb.c
@@ -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;