recipes-kernel/linux/linux-ti33x-psp-3.2/beaglebone/0075-video-da8xx-fb-calculate-pixel-clock-period-for-the-.patch

   1 From e12d15eadf15f8119729a65ecca79529b4fe3863 Mon Sep 17 00:00:00 2001
   2 From: "Manjunathappa, Prakash" <prakash.pm@ti.com>
   3 Date: Wed, 4 Jul 2012 17:10:16 +0530
   4 Subject: [PATCH 75/79] video:da8xx-fb: calculate pixel clock period for the
   5  panel
   6
   7 Patch calculates pixel clock period in pico seconds and updates
   8 the same in variable screen information structure. fbset utility
   9 uses this information.
  10 This patch is from upstream backport, bearing commit id
  11 12fa8350244d73b6111ec9bc6c2fd5d49fa601b5.
  12
  13 Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
  14 Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
  15 Signed-off-by: Patil, Rachna <rachna@ti.com>
  16 ---
  17  drivers/video/da8xx-fb.c |   19 ++++++++++++++++++-
  18  1 file changed, 18 insertions(+), 1 deletion(-)
  19
  20 diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
  21 index 010a8bc..ddc251e 100644
  22 --- a/drivers/video/da8xx-fb.c
  23 +++ b/drivers/video/da8xx-fb.c
  24 @@ -37,6 +37,7 @@
  25  #include <linux/lcm.h>
  26  #include <video/da8xx-fb.h>
  27  #include <asm/mach-types.h>
  28 +#include <asm/div64.h>
  29
  30  #define DRIVER_NAME "da8xx_lcdc"
  31
  32 @@ -192,7 +193,6 @@ static struct fb_var_screeninfo da8xx_fb_var __devinitdata = {
  33         .activate = 0,
  34         .height = -1,
  35         .width = -1,
  36 -       .pixclock = 33333,/*Pico Sec*/
  37         .accel_flags = 0,
  38         .left_margin = LEFT_MARGIN,
  39         .right_margin = RIGHT_MARGIN,
  40 @@ -1267,6 +1267,22 @@ static struct fb_ops da8xx_fb_ops = {
  41         .fb_blank = cfb_blank,
  42  };
  43
  44 +/* Calculate and return pixel clock period in pico seconds */
  45 +static unsigned int da8xxfb_pixel_clk_period(struct da8xx_fb_par *par)
  46 +{
  47 +       unsigned int lcd_clk, div;
  48 +       unsigned int configured_pix_clk;
  49 +       unsigned long long pix_clk_period_picosec = 1000000000000ULL;
  50 +
  51 +       lcd_clk = clk_get_rate(par->lcdc_clk);
  52 +       div = lcd_clk / par->pxl_clk;
  53 +       configured_pix_clk = (lcd_clk / div);
  54 +
  55 +       do_div(pix_clk_period_picosec, configured_pix_clk);
  56 +
  57 +       return pix_clk_period_picosec;
  58 +}
  59 +
  60  static int __devinit fb_probe(struct platform_device *device)
  61  {
  62         struct da8xx_lcdc_platform_data *fb_pdata =
  63 @@ -1437,6 +1453,7 @@ static int __devinit fb_probe(struct platform_device *device)
  64
  65         da8xx_fb_var.hsync_len = lcdc_info->hsw;
  66         da8xx_fb_var.vsync_len = lcdc_info->vsw;
  67 +       da8xx_fb_var.pixclock = da8xxfb_pixel_clk_period(par);
  68
  69         da8xx_fb_var.right_margin = lcdc_info->hfp;
  70         da8xx_fb_var.left_margin  = lcdc_info->hbp;
  71 --
  72 1.7.10
  73