[alsa-devel] [GIT PULL FOR 2.6.39] Media controller and OMAP3 ISP driver
dacohen at gmail.com
Fri Mar 4 23:49:04 CET 2011
On Sat, Mar 5, 2011 at 12:43 AM, Mauro Carvalho Chehab
<mchehab at redhat.com> wrote:
> Em 04-03-2011 19:33, David Cohen escreveu:
>> Hi Mauro,
>> On Sat, Mar 5, 2011 at 12:16 AM, Mauro Carvalho Chehab
>> <mchehab at redhat.com> wrote:
>>> Hi Laurent,
>>> Em 17-02-2011 13:06, Laurent Pinchart escreveu:
>>>> Hi Mauro,
>>>> The following changes since commit 85e2efbb1db9a18d218006706d6e4fbeb0216213:
>>>> Linux 2.6.38-rc5 (2011-02-15 19:23:45 -0800)
>>>> are available in the git repository at:
>>>> git://linuxtv.org/pinchartl/media.git media-0005-omap3isp
>>> I've added the patches that looked ok on my eyes at:
>>> There are just a few small adjustments on a few of them, as I've commented.
>>> I prefer if you do them on separate patches, to save my work of not needing
>>> to review the entire series again.
>>> The ones still pending on my quilt tree are:
>>> with the following diffstat:
>>> Documentation/video4linux/v4l2-framework.txt | 5 +
>>> MAINTAINERS | 6 +
>>> drivers/media/video/Kconfig | 13 +
>>> drivers/media/video/Makefile | 2 +
>>> drivers/media/video/omap3-isp/Makefile | 13 +
>>> drivers/media/video/omap3-isp/cfa_coef_table.h | 61 +
>>> drivers/media/video/omap3-isp/gamma_table.h | 90 +
>>> drivers/media/video/omap3-isp/isp.c | 2220 +++++++++++++++++++
>>> drivers/media/video/omap3-isp/isp.h | 428 ++++
>>> drivers/media/video/omap3-isp/ispccdc.c | 2268 ++++++++++++++++++++
>>> drivers/media/video/omap3-isp/ispccdc.h | 219 ++
>>> drivers/media/video/omap3-isp/ispccp2.c | 1173 ++++++++++
>>> drivers/media/video/omap3-isp/ispccp2.h | 98 +
>>> drivers/media/video/omap3-isp/ispcsi2.c | 1317 ++++++++++++
>>> drivers/media/video/omap3-isp/ispcsi2.h | 166 ++
>>> drivers/media/video/omap3-isp/ispcsiphy.c | 247 +++
>>> drivers/media/video/omap3-isp/ispcsiphy.h | 74 +
>>> drivers/media/video/omap3-isp/isph3a.h | 117 +
>>> drivers/media/video/omap3-isp/isph3a_aewb.c | 374 ++++
>>> drivers/media/video/omap3-isp/isph3a_af.c | 429 ++++
>>> drivers/media/video/omap3-isp/isphist.c | 520 +++++
>>> drivers/media/video/omap3-isp/isphist.h | 40 +
>>> drivers/media/video/omap3-isp/isppreview.c | 2113 ++++++++++++++++++
>>> drivers/media/video/omap3-isp/isppreview.h | 214 ++
>>> drivers/media/video/omap3-isp/ispqueue.c | 1153 ++++++++++
>>> drivers/media/video/omap3-isp/ispqueue.h | 187 ++
>>> drivers/media/video/omap3-isp/ispreg.h | 1589 ++++++++++++++
>>> drivers/media/video/omap3-isp/ispresizer.c | 1693 +++++++++++++++
>>> drivers/media/video/omap3-isp/ispresizer.h | 147 ++
>>> drivers/media/video/omap3-isp/ispstat.c | 1092 ++++++++++
>>> drivers/media/video/omap3-isp/ispstat.h | 169 ++
>>> drivers/media/video/omap3-isp/ispvideo.c | 1255 +++++++++++
>>> drivers/media/video/omap3-isp/ispvideo.h | 202 ++
>>> drivers/media/video/omap3-isp/luma_enhance_table.h | 42 +
>>> drivers/media/video/omap3-isp/noise_filter_table.h | 30 +
>>> drivers/media/video/v4l2-subdev.c | 2 +-
>>> drivers/media/video/videobuf-dma-contig.c | 2 +-
>>> include/linux/Kbuild | 1 +
>>> 38 files changed, 19769 insertions(+), 2 deletions(-)
>>> I used quilt for all patches, except for the one patch with some gifs, where I did a
>>> git cherry-pick. So, the imported patches should be ok. Of course, it doesn't hurt
>>> do double check.
>>> The main issue with the omap3isp is due to the presence of private ioctl's that
>>> I don't have a clear idea about what they are really doing.
>>> I couldn't see any documentation about them on a very quick look. While I suspect
>>> that they are used only for 3A, I have no means of being sure about that.
>>> Also, as I've said several times, while I don't like, I have nothing against
>>> having some ioctls that would be used by a vendor to implement their own 3A software
>>> algorithms that he may need to hide for some reason or have any patents applied to
>>> the algorithm, but only if:
>>> 1) such algorithms are implemented on userspace;
>>> 2) the userspace API used by them is fully documented, in order
>>> to allow that someone else with enough motivation and spare time may
>>> want to implement his own algorithm (including an open-source one);
>> The API is pretty close to what is found on public OMAP3 TRM. I'd say
>> it's almost to fill registers through a userspace API.
> Ok, so a simple patch adding a txt file documenting those private ioctls
> to Documentation/video4linux explaining how to use them and pointing to
> OMAP3 TRM documentation is enough.
Ok. I'll provide a patch for it.
>>> 3) there are no patents denying or charging for the usage and/or
>>> distribution/redistribution of the Kernel with the provided kernel driver;
>> I'd say there's no patent / charge for usage or redistribution. But
>> that's lawyer stuff. :/
>>> 4) if the device works with a reasonable quality without them
>>> (by reasonable I mean like a cheap webcam, where libv4l could use his
>>> set of 3A algorithms to provide a good quality).
>> It depends on the sensor as well, but in general should work with a
>> reasonable quality without using statistic modules.
>>> Assuming that all those private ioctl's are really for 3A, it is ok for me
>>> to accept such ioctls after being sure that the above applies. I'm not sure
>>> how to check (4), as, while I have 2 omap boards here (a Beagleboard and a
>>> gumstix), none of them have any sensor.
>> The private ioctl are used mostly on statistic modules (3A and
>> Histogram). But it's used for CCDC and Preview modules configuration
> The issue here is: what if no CCDC and no Preview initialization ever happen?
Currently the driver does not support such situation. Either all
modules successfully initialize or ISP driver doesn't probe correctly.
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