diff options
| author | Manjunathappa, Prakash <prakash.pm@ti.com> | 2012-02-09 07:24:06 +0100 |
|---|---|---|
| committer | Florian Tobias Schandinat <FlorianSchandinat@gmx.de> | 2012-02-13 04:01:47 +0100 |
| commit | 12fa8350244d73b6111ec9bc6c2fd5d49fa601b5 (patch) | |
| tree | 04e2188407951dc01295676604bbd7f2cd8307bc /drivers/video/da8xx-fb.c | |
| parent | video: da8xx-fb: Fix build warning on unused label (diff) | |
| download | linux-12fa8350244d73b6111ec9bc6c2fd5d49fa601b5.tar.xz linux-12fa8350244d73b6111ec9bc6c2fd5d49fa601b5.zip | |
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>
Diffstat (limited to 'drivers/video/da8xx-fb.c')
| -rw-r--r-- | drivers/video/da8xx-fb.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c index 720cb837feda..dd80386b0ed6 100644 --- 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; |