Re: Pandaboard Kernel 3.8.13.6 no HDMI

[Archit Taneja <archit@ti.com>]

Hi,

There are a couple of options here.

On Tuesday 03 September 2013 06:14 AM, Sid Boyce wrote:
> The Pandaboard list seems dormant so I am seeking help here.
>
> The previous kernel with HDMI video output was 3.2.7x5.
>
> I built and installed this new kernel with this xorg.conf, it does not
> work.
> Section "Device"
>          Identifier      "fb0"
>          Driver "omapfb"
>          Option "fb" "/dev/fb0"
> EndSection

Looks like the problem below was buffer allocation. You could use 
omapdrm instead of omapfb which should allocate buffers successfully. I 
think the omapdrm drivers was in staging at that point. You could search 
for it in the .config, and set NUM_CRTCS to 2.

>
> Section "Monitor"
>          Identifier "HP"
>          ModeLine "1920x1080" 148.501  1920 2008 2052 2200  1080 1084 1089
> 1125 -HSync -VSync
> EndSection
>
> Section "Screen"
>          Identifier      "screen0"
>          Device  "fb0"
>          Monitor "HP"
>          DefaultDepth    16
>          SubSection "Display"
>                  Depth   16
>                  Modes   "1920x1080" "800x480"
>          EndSubSection
> EndSection
>
> Mode "800x480"
>      # D: 29.001 MHz, H: 31.251 kHz, V: 59.525 Hz
>      DotClock 29.002
>      HTimings 800 840 888 928
>      VTimings 480 503 506 525
>      Flags    "-HSync" "-VSync"
> EndMode
>
> Using the udlfb driver and an xorg.conf for the Lilliput USB 7" screen
> there is no problem, LXDE is up and running and CRTL-ALT-F1 etc. all
> OK,  but I need the USB screen for the Beaglebone.
>
> root@panda:/etc/X11# lsmod
> Module                  Size  Used by
> omapdss               253516  0
> udlfb                  17703  2
> bluetooth             221172  6
> snd_usb_audio         115881  0
> snd_usbmidi_lib        18680  1 snd_usb_audio
> snd_rawmidi            21747  1 snd_usbmidi_lib
> snd_hwdep               6190  1 snd_usb_audio
> snd_pcm_oss            42617  0
> snd_mixer_oss          14244  1 snd_pcm_oss
> snd_pcm                84961  2 snd_pcm_oss,snd_usb_audio
> snd_page_alloc          5296  1 snd_pcm
> snd_timer              20277  1 snd_pcm
> snd                    61483  8
> snd_pcm_oss,snd_usb_audio,snd_hwdep,snd_timer,snd_pcm,snd_rawmidi,snd_usbmidi_lib,snd_mixer_oss
>
> soundcore               7260  1 snd
> ehci_hcd               54613  0
> ohci_hcd               31836  0
> root@panda:/etc/X11# ls /lib/modules/3.8.13.6x-dirty/kernel/drivers/video/
> backlight  omap2  udlfb.ko
> root@panda:/etc/X11# ll
> /lib/modules/3.8.13.6x-dirty/kernel/drivers/video/omap2/omapfb
> total 64
> drwxr-xr-x 2 root root  4096 Sep  2 10:18 ./
> drwxr-xr-x 5 root root  4096 Sep  2 10:18 ../
> -rw-r--r-- 1 root root 56916 Sep  2 02:52 omapfb.ko
> root@panda:/etc/X11# modprobe omapfb
> ERROR: could not insert 'omapfb': No such device
> root@panda:/etc/X11# insmod
> /lib/modules/3.8.13.6x-dirty/kernel/drivers/video/omap2/omapfb/omapfb.ko
> Error: could not insert module
> /lib/modules/3.8.13.6x-dirty/kernel/drivers/video/omap2/omapfb/omapfb.ko: No
> such device
> root@panda:/1/ubuntu-raring# grep CONFIG_FB .config
> CONFIG_FB=y
> CONFIG_FB_CFB_FILLRECT=y
> CONFIG_FB_CFB_COPYAREA=y
> CONFIG_FB_CFB_IMAGEBLIT=y
> CONFIG_FB_SYS_FILLRECT=y
> CONFIG_FB_SYS_COPYAREA=y
> CONFIG_FB_SYS_IMAGEBLIT=y
> CONFIG_FB_SYS_FOPS=y
> CONFIG_FB_DEFERRED_IO=y
> CONFIG_FB_MODE_HELPERS=y
> CONFIG_FB_TILEBLITTING=y
> CONFIG_FB_ARMCLCD=y
> CONFIG_FB_UVESA=y
> CONFIG_FB_TMIO=y
> CONFIG_FB_TMIO_ACCELL=y
> CONFIG_FB_UDL=m
> CONFIG_FB_VIRTUAL=y
> CONFIG_OMAP2_VRFB=y
> CONFIG_OMAP2_DSS_RFBI=y
> CONFIG_FB_OMAP2=m
> CONFIG_FB_OMAP2_DEBUG_SUPPORT=y
> CONFIG_FB_OMAP2_NUM_FBS=3

The other option is to figure out why it's not working with omapfb. 
Could you add a CONFIG_OMAP2_DSS_DEBUG in order to get additional DSS 
prints?

>
> root@panda:/etc/X11# grep HDMI /1/ubuntu-raring/.config
> CONFIG_OMAP4_DSS_HDMI=y
>
> ONFIG_ARCH_OMAP4=y
> CONFIG_MACH_OMAP4_PANDA=y
>
> Displayed on the serial console
> =======================
> root@panda:~# [34587.439270] omapdss error: timeout reading edid
> [34587.445220] omapfb omapfb: failed to allocate framebuffer
> [34587.450958] omapfb omapfb: failed to allocate fbmem
> [34587.456604] omapfb omapfb: failed to setup omapfb
> [34587.461853] failed to register omapfb driver

The debug prints will help with the edid timeout. About the allocation 
of buffers, I think it should work if you enable CMA. And set 
CONFIG_CMA_SIZE_MBYTES to say, 24 Mb. That should allocate the buffers 
successfully.

Archit