linux (android) video显示分辨率的初始化设置及解析过程

kernkel/fs/proc/proc_misc.c中： proc_misc_init()  -> cmdline_read_proc() 读出/proc/cmdline的值

2.2

drivers/video/fbmem.c

__setup("video=", video_setup);

static int __init video_setup(char *options) //把video的参数保存到options中

2.3

drivers/video/mxc/mxc_ipuv3_fb.c

static int mxcfb_option_setup(struct platform_device *pdev, struct fb_info *fbi) 解析字符串“ideo=mxcfb0:dev=hdmi,1920x1080M@60 ”把

1920x1080M保存到pdata->mode_str

如果在uboot中没用设置到vidoe=参数

arch/arm/mach-mx6/board-mx6_xxx.c中有默认设置

static struct ipuv3_fb_platform_data board_fb_data[] = {

    { /*fb0*/ 	.disp_dev = "hdmi", 	.interface_pix_fmt = IPU_PIX_FMT_RGB24, 	.mode_str = "1920x1080M@60", 	.default_bpp = 32, 	.int_clk = false, 	.late_init = false, 	}

}

 static void __init fixup_mxc_board(struct machine_desc *desc, struct tag *tags, 		char **cmdline, struct meminfo *mi) 	{ 		char *str; 		struct tag *t; 		int i = 0; 		struct ipuv3_fb_platform_data *pdata_fb = board_fb_data; 	 

}