Dear NXP,
On I.MX6Q reference code, the HDMI output is 1920x1080@60fps or 1280x720@60fps, but we want to support 1280x720@30fps output, I did some changes as below:
1. u-boot parameter:
Kernel command line: console=ttymxc0,115200 video=mxcfb0:dev=hdmi,1280x720M@30,if=RGB24,bpp=32
2. kernel:
2.1 add new_mode for 1280x720@30fps output,
static const struct fb_videomode new_mode = {
NULL, 30, 1280, 720, 26936, 220, 110, 20, 5, 40, 5,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_NONINTERLACED | FB_VMODE_ASPECT_16_9, 0
};
2.2 add new_mode in function mxc_hdmi_edid_rebuild_modelist()
fb_add_videomode(&new_mode, &hdmi->fbi->modelist);
3. enable function dump_fb_videomode()
4. kernel log:
mxc_hdmi 20e0000.hdmi_video: Detected HDMI controller 0x13:0xa:0xa0:0xc1
fbcvt: Refresh rate not CVT standard
fbcvt:
1280x720@30: CVT Name - Not a CVT standard - 0.921 Mega Pixel Image
fb_videomode = 29 1280 720 28368 160 32 3 8 128 5 2 0 32
Question:
1. Why the fb_videomode is different with new_mode?
2. Why I can't find the parameters of fb_videomode in the code?
3. Why the HDMI display is still 60fps?
