On 18/03/14 10:19, Dmitry Lifshitz wrote:
> Hi Tomi,
> 
> Thank you a lot for your assistance.
> 
> Here are my relevant DT nodes:
> 
> / {
>         aliases {
>                 display0 = &hdmi0;
>         };
> 
>         hdmi0: connector@0 {
>                 compatible = "hdmi-connector";
>                 label = "hdmi";
> 
>                 type = "b";
> 
>                 hdmi_connector_in: endpoint {
>                         remote-endpoint = <&hdmi_out>;
>                 };
>         };
> };
> 
> &dss {
>         status = "ok";
> };
> 
> &hdmi {
>         status = "ok";
>         vdda-supply = <&ldo4_reg>;
> 
>         pinctrl-names = "default";
>         pinctrl-0 = <&dss_hdmi_pins>;
> 
>         hdmi_out: endpoint {
>                 remote-endpoint = <&hdmi_connector_in>;
>         };
> };

The above looks fine.

> I have the following kernel crash (caused by missing .detect callback):

Yes, it seems the hdmi driver is missing detect, as there's no support
in there for the detection at the moment. You can add the function to
omap5.c, and return true always.

How does the HPD work on your board? On uevm, the ESD/Level shifter chip
handles HPD, which is the only supported way at the moment.

> While using FBDEV I have the following issue:
> 
> root@cm-debian:~# modprobe omapfb
> [   27.524419] ------------[ cut here ]------------
> [   27.529256] WARNING: CPU: 1 PID: 2087 at
> /home/lifshitz/workroot/OMAP5-eewiki/omap5-kernel/mm/page_alloc.c:2492
> __alloc_pages_nodemask+0x268/0x83c()
> [   27.543164] Modules linked in: omapfb(+) cfbcopyarea cfbimgblt
> cfbfillrect bnep rfcomm bluetooth 6lowpan_iphc phy_omap_usb2
> connector_hdmi omapdss omap4_keypad matrix_keymap omap_ocp2scp
> rtc_palmas spi_omap2_mcspi
> [   27.563113] CPU: 1 PID: 2087 Comm: modprobe Tainted: G W   
> 3.14.0-rc4-cm-t54-test-suit+ #108
> [   27.572677] [<c00280ac>] (unwind_backtrace) from [<c0024eb0>]
> (show_stack+0x10/0x14)
> [   27.580786] [<c0024eb0>] (show_stack) from [<c06fc434>]
> (dump_stack+0x70/0x88)
> [   27.588341] [<c06fc434>] (dump_stack) from [<c004d8e8>]
> (warn_slowpath_common+0x70/0x88)
> [   27.596815] [<c004d8e8>] (warn_slowpath_common) from [<c004d91c>]
> (warn_slowpath_null+0x1c/0x24)
> [   27.606004] [<c004d91c>] (warn_slowpath_null) from [<c01135ec>]
> (__alloc_pages_nodemask+0x268/0x83c)
> [   27.615562] [<c01135ec>] (__alloc_pages_nodemask) from [<c002cd78>]
> (__dma_alloc_buffer.isra.16+0x2c/0xdc)
> [   27.625661] [<c002cd78>] (__dma_alloc_buffer.isra.16) from
> [<c002ce40>] (__alloc_remap_buffer.isra.19+0x18/0xcc)
> [   27.636300] [<c002ce40>] (__alloc_remap_buffer.isra.19) from
> [<c002d248>] (__dma_alloc+0x110/0x138)
> [   27.645757] [<c002d248>] (__dma_alloc) from [<c002d3fc>]
> (arm_dma_alloc+0xb0/0xd8)
> [   27.653686] [<c002d3fc>] (arm_dma_alloc) from [<bf1b1f74>]
> (omapfb_alloc_fbmem.isra.24+0xc8/0x158 [omapfb])
> [   27.663911] [<bf1b1f74>] (omapfb_alloc_fbmem.isra.24 [omapfb]) from
> [<bf1b7078>] (omapfb_alloc_fbmem_display.isra.25+0xec/0xfc [omapfb])
> [   27.676759] [<bf1b7078>] (omapfb_alloc_fbmem_display.isra.25
> [omapfb]) from [<bf1b21fc>] (omapfb_allocate_all_fbs+0xf4/0x174 [omapfb])
> [   27.689419] [<bf1b21fc>] (omapfb_allocate_all_fbs [omapfb]) from
> [<bf1b30f8>] (omapfb_create_framebuffers+0x1fc/0x524 [omapfb])
> [   27.701432] [<bf1b30f8>] (omapfb_create_framebuffers [omapfb]) from
> [<bf1b3fdc>] (omapfb_probe+0x28c/0x41c [omapfb])
> [   27.712446] [<bf1b3fdc>] (omapfb_probe [omapfb]) from [<c03ab844>]
> (platform_drv_probe+0x18/0x48)
> [   27.721728] [<c03ab844>] (platform_drv_probe) from [<c03a9a4c>]
> (really_probe+0x80/0x208)
> [   27.730284] [<c03a9a4c>] (really_probe) from [<c03a9ce4>]
> (driver_probe_device+0x30/0x48)
> [   27.738834] [<c03a9ce4>] (driver_probe_device) from [<c03a9d88>]
> (__driver_attach+0x8c/0x90)
> [   27.747661] [<c03a9d88>] (__driver_attach) from [<c03a845c>]
> (bus_for_each_dev+0x54/0x88)
> [   27.756220] [<c03a845c>] (bus_for_each_dev) from [<c03a9338>]
> (bus_add_driver+0xe4/0x1d8)
> [   27.764778] [<c03a9338>] (bus_add_driver) from [<c03aa3e4>]
> (driver_register+0x78/0xf4)
> [   27.773148] [<c03aa3e4>] (driver_register) from [<c0008788>]
> (do_one_initcall+0x44/0x174)
> [   27.781703] [<c0008788>] (do_one_initcall) from [<c06f2934>]
> (do_init_module+0x48/0x17c)
> [   27.790172] [<c06f2934>] (do_init_module) from [<c00bad0c>]
> (SyS_init_module+0x64/0x6c)
> [   27.798546] [<c00bad0c>] (SyS_init_module) from [<c0020d80>]
> (ret_fast_syscall+0x0/0x30)
> [   27.807015] ---[ end trace 842d286115ab739d ]---
> [   27.811849] omapfb omapfb: failed to allocate framebuffer
> [   27.817490] omapfb omapfb: failed to allocate fbmem
> [   27.822746] omapfb omapfb: failed to setup omapfb
> [   27.827710] omapfb: probe of omapfb failed with error -12

Hmm, do you have CMA enabled? Maybe something like:

CONFIG_DMA_CMA=y
CONFIG_CMA_SIZE_MBYTES=32
CONFIG_CMA_SIZE_SEL_MBYTES=y

And if you have omap5-uevm, you could first try that one to see if you
get the branch working.

 Tomi