Hi Borut,
On Tue, Sep 28, 2021 at 04:31:11PM +0200, Borut Lampe wrote:
> Hi Jacopo,
>
> I am using MIPI CSI-2 with the Qualcomm Camera Subsystem driver on a
> custom 820 dragonboard.
2 lanes, right ?
I don't have an easy solution but I can provide a bit of context.
It started with
aa2882481cad ("media: ov5640: Adjust the clock based on the expected rate")
where we moved to compute the clock tree at runtime instead of relying
on the hardcoded configuration in the register tables:
c14d107e7417 ("media: ov5640: Remove the clocks registers initialization")
>From there the ov5640_set_mipi_pclk() went in and we never really got
to a version that works for all the modes supported by the sensor.
There were a few attempts to improve it, Tomi has found a discrepancy
in the H/V TOT values, I tried to re-implement the CSI-2 clock tree
calculation, but we never get to a set of results that was globally
satisfying and I guess we all dropped the ball
You can find more about that here:
https://patchwork.linuxtv.org/project/linux-media/cover/20201028225706.110078-1-jacopo+renesas@xxxxxxxxxx/
And if you're willing to test those patches and see if the situation
improves it would be very useful.
Thanks and good luck!
>
> Kind regards,
> Borut
>
> V V tor., 28. sep. 2021 ob 11:49 je oseba Jacopo Mondi
> <jacopo@xxxxxxxxxx> napisala:
> >
> > Hi Borut,
> > which kind of setup are you working with, parallel or CSI-2 ?
> >
> > On Thu, Sep 23, 2021 at 12:37:01PM +0200, Borut Lampe wrote:
> > > Hi,
> > >
> > > I noticed that for now only VGA resolution supports 60fps even though
> > > the documentation says that 60fps is possible also for 1280x720.
> > > Is there a reason this hasn't been implemented yet (e.g hardware
> > > restraints)? Are there any plans to implement this? Can anyone give me
> > > some pointers on what would have to be changed in the ov5640 driver to
> > > achieve this (starting point would be linaro kernel qcomlt-4.14)?
> > >
> > > Kind regards,
> > > Borut
