[PATCH] video:da8xx-fb: calculate pixel clock period for the panel
From: Manjunathappa, Prakash <hidden>
Date: 2012-02-09 05:20:58
Also in:
lkml
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
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 <redacted> --- drivers/video/da8xx-fb.c | 21 ++++++++++++++++++++- 1 files changed, 20 insertions(+), 1 deletions(-)
diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
index f360d62..8b0a174 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"
@@ -174,7 +175,6 @@ 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,
@@ -1048,6 +1048,24 @@ static struct fb_ops da8xx_fb_ops = { .fb_blank = cfb_blank, }; +/* + * Calculate and return pixel clock period in pico secods + */ +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 @@ -1209,6 +1227,7 @@ 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;
--
1.7.1