Re: Re: Re: hooking Sony 47MPixel sensor to NXP imx8m-mini MIPI CSI2

[Alexander Stein <alexander.stein@ew.tq-group.com>]

Hi Petko,

Am Dienstag, 5. Juli 2022, 17:13:05 CEST schrieb Petko Manolov:
> On 22-07-05 16:42:16, Alexander Stein wrote:
> > Hi Petko,
> > 
> > Am Dienstag, 5. Juli 2022, 11:43:29 CEST schrieb Petko Manolov:
> > > On 22-06-30 22:42:57, Laurent Pinchart wrote:
> > > > On Thu, Jun 30, 2022 at 09:52:05PM +0300, Petko Manolov wrote:
> > > > > On 22-06-30 03:50:55, Laurent Pinchart wrote:
> > > > > > For an i.MX8MM I'd try running the mainline kernel directly. If
> > > > > > that
> > > > > > doesn't work, I would backport the camera drivers from mainline to
> > > > > > the
> > > > > > v5.15 NXP kernel. As far as I know, the v5.18 branch isn't an
> > > > > > official
> > > > > > BSP release (I'm actually not sure what it's for).
> > > > > 
> > > > > The 5.15 NXP kernel got released sometime in June, but the CSI
> > > > > capture
> > > > > drivers are pretty much the same as in their older versions.  So
> > > > > sad...
> > > > > 
> > > > > Nevermind, i'll share any good news here as well as the imx492
> > > > > driver
> > > > > code as soon i am certain it can successfully stream in at least one
> > > > > mode.
> > > > > 
> > > > > BTW, the 'fec' section in Variscite's var-som-symphony DT is broken
> > > > > for
> > > > > v5.18 (mainline) kernels. I am not certain whom should i send the
> > > > > patch.
> > > > > Would that be Rob Herring or should i just use 'git blame' to
> > > > > identify
> > > > > the victim? :)>
> > > > 
> > > > scripts/get_maintainer.pl is your friend for that.
> > > 
> > > Done, sent a patch for review to lkml and Rob.
> > 
> > Do you have a link for the mailing list archive? I failed to find the
> > patch. I just want to check how things are done compared to other
> > sensors.
> 
> There you go.
> 
> The driver is neither interesting nor complex.  It seems, however, that
> getting this to run on imx8m-mini will require either other tools than
> plain v4l2-ctl or i am missing something here.
> 
> I wonder if i have to play with media-ctl and connect all the dots between
> the Sony sensor, to mipi-csi bridge to the imx7-capture (or whatever the
> damn name is) device.

Thanks! Indeed at a first glance it looks straight forward.
I was trying to get an imx327 running on a imx8mm, called TQMa8MxML. See [1] 
for some details. The cover letter describes the config setup. The media-ctl 
commands might help your setup.
Note the settle times are an ugly bitch and are crucial to be set on my board, 
but I'm not sure why they have to be that way.
Patch 1-8 are obsolete by now with the updates to drivers/media/platform/nxp/
imx-mipi-csis.c. Patch 9 might help you configure the DT.

Best regards,
Alexander

[1] https://patchwork.kernel.org/project/linux-media/cover/
20220211142752.779952-1-alexander.stein@ew.tq-group.com/