How to config four-screen display -blog archive

hongdong_chu · ‎08-30-2012

Per customer's request, we demonstrated four-screen display on MX6Q ARM2 board, the following table is

customer's requirements.

video stream UI output resolution

Disp0(LVDS0) 720P 3D@60fps LDB_XGA(1024x768)

Disp1(LVDS1) none 2D LDB_XGA(1024x768)

Disp2(LCD) none 2D CLAA_WVGA(800x480)

Disp3(HDMI) 1080P 3D@30fps 1080P(1920x1080)

Here are steps to config multi-display

1. Hardware environment

MX6Q ARM2 board

TV set with HDMI port

Two LVDS panel

One LCD panel

2, Linux Release packages

L3.0.15_12.05.01_ER_source.tar.gz

fsl-mm-codeclib-2.0.9.tar.gz

gst-fsl-plugin-2.0.9.tar.gz

3. Software configuration

3.1 Frame buffer allocation

Video and UI will be blended on hdmi and lvds0, it is processed in DP. For lvds1 and lcd, the data goes through DC.

Configuration in arch/arm/mach-mx6/board-mx6q_arm2.c:

static struct ipuv3_fb_platform_data sabr_fb_data[] = {

{ /*fb0*/

.disp_dev = "ldb",

.interface_pix_fmt = IPU_PIX_FMT_RGB666,

.mode_str = "LDB-XGA",

.default_bpp = 32,

.int_clk = false,

}, {

.disp_dev = "ldb",

.interface_pix_fmt = IPU_PIX_FMT_RGB666,

.mode_str = "LDB-XGA",

.default_bpp = 16,

.int_clk = false,

}, {

.disp_dev = "hdmi",

.interface_pix_fmt = IPU_PIX_FMT_RGB24,

.mode_str = "1920x1080M@60",

.default_bpp = 32,

.int_clk = false,

}, {

.disp_dev = "lcd",

.interface_pix_fmt = IPU_PIX_FMT_RGB565,

.mode_str = "CLAA-WVGA",

.default_bpp = 16,

.int_clk = false,

}

};

static struct fsl_mxc_hdmi_core_platform_data hdmi_core_data = {

.ipu_id = 0,

.disp_id = 1,

};

static struct fsl_mxc_lcd_platform_data lcdif_data = {

.ipu_id = 0,

.disp_id = 0,

.default_ifmt = IPU_PIX_FMT_RGB565,

};

static struct fsl_mxc_ldb_platform_data ldb_data = {

.ipu_id = 1,

.disp_id = 0,

.ext_ref = 1,

.mode = LDB_SEP0,

.sec_ipu_id = 1,

.sec_disp_id = 1,

};

It results in frame buffer allocation as below:

+--------> IPU1 DP-BG : /dev/fb0 <----> /dev/video16

LVDS0 -------+

+--------> IPU1 DP-FG : /dev/fb1 <-----> /dev/video17

LVDS1 --------> IPU1 DC : /dev/fb2 <-----> /dev/video18

+--------> IPU0 DP-BG : /dev/fb3 <----> /dev/video19

HDMI -------+

+--------> IPU0 DP-FG : /dev/fb4 <-----> /dev/video20

LCD --------> IPU0 DC : /dev/fb5 <-----> /dev/video21

3.2 3D on video overlay

3D UI is blended on video, so it goes through DP-FG, and video goes through DP-BG. In 3D sample code,

fbGetDisplay() is used to get default display. In order to show 3D to different display,fbGetDisplayByIndex(index) should be used, here index 0 for fb0, index 1 for fb1, index 2 for fb2, index3 for fb3, index 4 for fb4, index 5 for fb5.

For 3D on LVDS0, use fbGetDisplayByIndex(1);

For 3D on HDMI, use fbGetDisplayByIndex(4);

3.3 3D UI frame rate

To fix 3D UI frame rate at 30 or 60, sample code should be changed as it runs as fast as possible by default.

cube

Attached cube could be used for test, with which fb and framerate can be set, it is used like this.

insmod /lib/modules/3.0.15-1453-g5ac8a7a/kernel/drivers/mxc/gpu-viv/galcore.ko;

./cube fb=* framerate=*

fb can be 0,1,2,3,4,5.

3.4 Alpha in pixel process

ARGB format image can be overlayed with alpha in pixel, and fb should be configed as below.

int fd;

struct fb_var_screeninfo fbvar;

fd = open("/dev/fb1", O_RDWR);

if (ioctl(fd, FBIOGET_VSCREENINFO, &fbvar) < 0)

{

printf("error ioctl\n");

return -1;

}

fbvar.bits_per_pixel = 32;

fbvar.xres = 1024;

fbvar.yres = 768;

fbvar.nonstd = v4l2_fourcc('B', 'G', 'R', 'A');

fbvar.transp.offset = 24;

fbvar.transp.length = 8;

fbvar.red.offset = 16;

fbvar.red.length = 8;

fbvar.green.offset = 8;

fbvar.green.length = 8;

fbvar.blue.offset = 0;

fbvar.blue.length = 8;

fbvar.activate = FB_ACTIVATE_FORCE;

if (ioctl(fd, FBIOPUT_VSCREENINFO, &fbvar) < 0)

{

printf("error ioctl\n");

return -1;

}

struct mxcfb_gbl_alpha ga;

ga.enable = 0;

ioctl(fd, MXCFB_SET_GBL_ALPHA, &ga);

struct mxcfb_loc_alpha la;

la.enable = 1;

la.alpha_in_pixel = 1;

ioctl(fd, MXCFB_SET_LOC_ALPHA, &la);

ioctl(fd, FBIOBLANK, FB_BLANK_UNBLANK);

close(fd);

4. Script to run multi-display

#!/bin/bash

# HDMI

gst-launch filesrc location=/unit_tests/1080P.mov typefind=true ! aiurdemux name=demux demux. ! queue

max-size-buffers=0 max-size-time=0 ! vpudec ! mfw_v4lsink device="/dev/video19" disp-width=1920 disp-

height=1080 demux. ! queue max-size-buffers=0 max-size-time=0 ! beepdec ! audioconvert ! 'audio/x-raw-

int, channels=2' ! alsasink &

sleep 8

insmod /lib/modules/3.0.15-1453-g5ac8a7a/kernel/drivers/mxc/gpu-viv/galcore.ko ; /cube2/cube &

# LVDS0

gst-launch filesrc location=/unit_tests/720P.mp4 typefind=true ! aiurdemux name=demux demux. ! queue max

-size-buffers=0 max-size-time=0 ! vpudec ! mfw_v4lsink device="/dev/video16" demux. ! queue max-size-

buffers=0 max-size-time=0 ! beepdec ! audioconvert ! 'audio/x-raw-int, channels=2' ! alsasink &

sleep 5

cd /cube1 ; ./cube &

# LVDS1

cd /unit_tests ; cat ui_test.bmp > /dev/fb2

# LCD

cd /unit_tests ; cat test.bmp > /dev/fb5

weikeng-jimmy · ‎01-17-2013

Hi Sir,

I set up two output of display (VGA and HDMI). The function workable when HDMI resolution is Full- HD (1920x1080) and VGA resolution is XGA (1024x768).

And multi -display can play different demo movies.(2 x 1080p 24 fps)

But VGA resolution is HD (1280X720) and HDMI resolution is Full- HD ,the function is fail(HDMI not output).

Can you give me some suggestion?

Thanks!

static struct ipuv3_fb_platform_data ext_sabresd_fb_data[] = {

/* for quad diaplay settings */

{

.disp_dev = "lcd",

.interface_pix_fmt = IPU_PIX_FMT_RGB24,

.mode_str = "LCD-HD",

.default_bpp = 16,

.int_clk = false,

},

{

.disp_dev = "hdmi",

.interface_pix_fmt = IPU_PIX_FMT_RGB24,

.mode_str = "1920x1080M@60",

.default_bpp = 16,

.int_clk = false,

},

{

.disp_dev = "ldb",

.interface_pix_fmt = IPU_PIX_FMT_RGB666,

.mode_str = "LDB-XGA",

.default_bpp = 16,

.int_clk = false,

},

{

.disp_dev = "ldb",

.interface_pix_fmt = IPU_PIX_FMT_RGB666,

.mode_str = "LDB-XGA",

.default_bpp = 16,

.int_clk = false,

},

};

static struct fsl_mxc_hdmi_core_platform_data_hdmi_core_data = {

.ipu_id = 1,

.disp_id = 0,

};

static struct fsl_mxc_lcd_platform_data lcdif_data = {

.ipu_id = 0,

.disp_id = 0,

.default_ifmt = IPU_PIX_FMT_RGB565,

};

static struct fsl_mxc_ldb_platform_data_ldb_data = {

.ipu_id = 0,

.disp_id = 1,

.ext_ref = 1,

.mode = LDB_SEP0,

.sec_ipu_id = 1,

.sec_disp_id = 1,

};

hongdong_chu · ‎01-17-2013

Is video mode "LCD-HD" added by yourself?

Have you tried to play low resolution demo movies(720P or SD)?

weikeng-jimmy · ‎01-18-2013

Yes , LCD-HD setting as below. And demo movies can play when downgrade movies resolution.

lcdif_modedb[] = {

{

/* 1920x1080 @ 60 Hz , pixel clk @ 148.5MHz */

"LCD-1920x1080", 60, 1920, 1080, 6734, 148, 88, 36, 4, 44, 5,

FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,

FB_VMODE_NONINTERLACED,

FB_MODE_IS_VESA},

{

"LCD-HD", 60, 1280, 720, 13468,

220, 110,

20, 5,

40, 5,

FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,

FB_VMODE_NONINTERLACED,

FB_MODE_IS_VESA},

}

joshkurland · ‎12-27-2013

I see that this thread is nearly a year old, but maybe someone will be able to respond. I am trying to output video from the parallel TTL LCD display at 1080i/p quality, and the LCD-HD setting looks like it might do just that. Can this code be used to play 1080i/p through the LCD display, and if so, how can I implement it into my own project? Would I add lcdif_modedb to board-mx6q_arm2.c, or would it need to be placed in the board-specific file (in my case board-wand.c)?

Thank you in advance, and I appreciate any response I can get.

Josh Kurland

Tarek · ‎12-20-2012

Can you please post the source code?

Thanks