Dual Channel LVDS on IMX53

[woutervh]

I want to use a dual channel (1 channel for even, 1 channel for odd pixels) LVDS 1920x1080 display on a Digi Connectore platform. I already have a baseboard with the two channels connected, but what do i do to drive this? Did anyone already did this?

bootargs for ldb bridge look like:

ldb=split,di=0,ch0_map=SPWG,ch1_map=SPWG

And videomode looks like:

static struct fb_videomode tlv19201080p = {
    .name        = "TLV19201080P",
    .refresh    = 60,            /* Refresh rate in Hz */
    .xres        = 1920,            /* Resolution in the x axis */
    .yres        = 1080,            /* Reslution in the y axis */
    .pixclock    = 13000,            /* Pixelclock/dotclock,picoseconds. */
    .left_margin    = 30,            /* Horizontal Back Porch (HBP) */
    .right_margin    = 30,            /* Horizontal Front Porch (HFP) */
    .upper_margin    = 15,            /* Vertical Back Porch (VBP) */
    .lower_margin    = 15,            /* Vetical Front Porch (VFP) */
    .hsync_len    = 40,            /* Horizontal sync pulse width */
    .vsync_len    = 10,            /* Vertical sync pulse width */
    .vmode        = FB_VMODE_NONINTERLACED, //FB_VMODE_NONINTERLACED,/* Video mode */
    .sync        = FB_SYNC_EXT,        /* Data clock polarity */
    .flag        = 0,
};

But for some reason, fysical screen is like a 1280x1080 screen (640 pixels are outside my screen region)

[qiang_li-mpu_se]

    The freescale BSP had supported a 1080P dual channel LVDS panel already, and the uboot parameters is as followed:

"video=mxcdi0fb:RGB24,1080P60,bpp=32 ldb=di0,split di0_primary dmfc=3"

    And in driver "ldb.c", the video mode is as followed:

struct fb_videomode mxcfb_ldb_modedb[] = {
 {
  "1080P60", 60, 1920, 1080, 7692,
  100, 40,
  30, 3,
  10, 2,
  0,
  FB_VMODE_NONINTERLACED,
  FB_MODE_IS_DETAILED,},
 };

[beomseokoh]

I am trying to display at 1080P dual channel LVDS panel.

I did test "video=mxcdi0fb:RGB24,1080P60,bpp=32 ldb=di0,split di0_primary dmfc=3"

but i got error message below

===================================================================================

mxc_ldb mxc_ldb: default di0 split mode

mxc_ipu mxc_ipu: Channel already disabled 9

mxc_ipu mxc_ipu: Channel already uninitialized 9

------------[ cut here ]------------

WARNING: at mm/page_alloc.c:1968 __alloc_pages_nodemask+0x16c/0x568()

Modules linked in:

[<8003d58c>] (unwind_backtrace+0x0/0xf0) from [<80068a44>] (warn_slowpath_common+0x4c/0x64)

[<80068a44>] (warn_slowpath_common+0x4c/0x64) from [<80068a74>] (warn_slowpath_null+0x18/0x1c)

[<80068a74>] (warn_slowpath_null+0x18/0x1c) from [<800a90b4>] (__alloc_pages_nodemask+0x16c/0x568)

[<800a90b4>] (__alloc_pages_nodemask+0x16c/0x568) from [<8003dfb0>] (__dma_alloc+0xec/0x2b8)

[<8003dfb0>] (__dma_alloc+0xec/0x2b8) from [<8003e198>] (dma_alloc_writecombine+0x1c/0x24)

[<8003e198>] (dma_alloc_writecombine+0x1c/0x24) from [<801ffe7c>] (mxcfb_set_par+0xd0/0x44c)

[<801ffe7c>] (mxcfb_set_par+0xd0/0x44c) from [<801f2cfc>] (fb_set_var+0x1b0/0x290)

[<801f2cfc>] (fb_set_var+0x1b0/0x290) from [<80201b84>] (mxcfb_probe+0x848/0x9f8)

[<80201b84>] (mxcfb_probe+0x848/0x9f8) from [<80233620>] (platform_drv_probe+0x18/0x1c)

[<80233620>] (platform_drv_probe+0x18/0x1c) from [<8023278c>] (driver_probe_device+0xc8/0x184)

[<8023278c>] (driver_probe_device+0xc8/0x184) from [<802328a8>] (__driver_attach+0x60/0x84)

[<802328a8>] (__driver_attach+0x60/0x84) from [<80231f9c>] (bus_for_each_dev+0x48/0x84)

[<80231f9c>] (bus_for_each_dev+0x48/0x84) from [<802318d8>] (bus_add_driver+0x98/0x214)

[<802318d8>] (bus_add_driver+0x98/0x214) from [<80232b94>] (driver_register+0xa8/0x138)

[<80232b94>] (driver_register+0xa8/0x138) from [<80038384>] (do_one_initcall+0x5c/0x1b8)

[<80038384>] (do_one_initcall+0x5c/0x1b8) from [<8000842c>] (kernel_init+0xac/0x168)

unwind: Unknown symbol address 8000842c

unwind: Index not found 8000842c

---[ end trace dec6997083161631 ]---

mxc_sdc_fb mxc_sdc_fb.0: Unable to allocate framebuffer memory

detected fb_set_par error, error code: -12

mxc_sdc_fb: probe of mxc_sdc_fb.0 failed with error -12

mxc_ipu mxc_ipu: Channel already disabled 7

mxc_ipu mxc_ipu: Channel already uninitialized 7

mxc_ipu mxc_ipu: Channel already disabled 10

mxc_ipu mxc_ipu: Channel already uninitialized 10

===================================================================================

do you have ant idea for solving about that problem.

Pls

what is dmfc=3?

environment

h/w:i.MX53 QSB s/w linux 2.6.35