[Gta04-owner] Camera and PVR/SGX patches for Kernel 3.7 - need help

Benjamin Deering ben_deering at swissmail.org
Thu Jan 31 05:19:05 CET 2013


On 01/27/2013 11:37 AM, Dr. H. Nikolaus Schaller wrote:
> Hi all,
> I have finally found some time to patch Neils 3.7 kernel to include
> the OV9655 and the PVR/SGX drivers like the old hw-validation kernel
> did.
>
> And I have added the panel driver for the OpenPhoenux 3704 device.
>
> But only the last one works.
>
> a) the OV9655 can be compiled, modprobed and shows up in
> lsmod - but nothing significant happens. It also loads nearly 10
> other modules for soc_camera and v4l2.
>
> It does neither call the driver's probe() function nor the power
> on/off management code that I have added to the gta04 board
> file.
>
> Does anyone know if the camera-soc interface really works for
> OMAP3? And what has to be done in addition to adding the
> driver structures in the board file to initialize it?
>
> Another note: the ov9655.c I have created is more or less a
> copy of the ov9640.c which appears to have almost the same
> register set - but since I have only a ov9640.h and no data
> sheet, the differences in detail are not clear. So it is not clear
> if the driver itself configures the camera correctly. But before
> it is probed that is a lower priority obstacle.
>
> One more note: this implementation approach is completely different
> from the old hw-validation kernel, where we did have a special
> TI image processing kernel driver and the ov9655 defined
> there only shares some initialization bit patterns.
>
>
> b) I have downloaded the latest Graphics_SDK_4_08_00_01.bin
> from TI, unpacked and have done the same integration approach
> as for the 2.6.32 kernel.
>
> After fixing the Makefile and the -D options plus some (minor?) changes
> to cope with kernel source changes after Linux 3.4 it finally compiled
> fine, but the kernel does not boot any more:
>
>
> Environment size: 2996/131068 bytes
> lcm state set to deep-standby
> display power off
> ## Booting kernel from Legacy Image at 82000000 ...
>    Image Name:   Linux-3.7.0-offmode-gta04
>    Image Type:   ARM Linux Kernel Image (uncompressed)
>    Data Size:    3191216 Bytes = 3 MiB
>    Load Address: 80008000
>    Entry Point:  80008000
>    Verifying Checksum ... OK
>    Loading Kernel Image ... OK
> OK
>
> Starting kernel ...
>
> Uncompressing Linux... done, booting the kernel.
>
> ---- here it hangs ----
>
>
> What I had to do is to configure video/gpudrm and PCI support to get it compiled.
>
> Especially the PCI thing is a little weird, since the TI SDK comes with a stub
> library that should replace everything from PCI. But that one doesn't compile.
>
> After deconfiguring SGX, DRM, PCI, it still compiles and now, the kernel boots again.
>
>
> The complete source tree is available here:
>
> <http://git.goldelico.com/?p=gta04-kernel.git;a=shortlog;h=refs/heads/hw-validation-3.x>
> <https://github.com/goldelico/gta04-kernel/commits/hw-validation-3.x>
>
> (you need to actively configure SGX530 first).
>
> Any ideas how to debug these issues? Anyone trying his/her luck?
>
> Nikolaus
>
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> Gta04-owner at goldelico.com
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>
With this change, ov9655 tries to probe, but fails:
[ 1259.122161] ov9655 2-0030: Missing platform_data for driver
[ 1259.122192] ov9655: probe of 2-0030 failed with error -22

It looks like that may be a known issue in the board file?
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