Re: [PATCH 0/6] Support second Image Signal Processor on rk3399

["Heiko Stübner" <heiko@sntech.de>]

Hi Sebastian,

Am Freitag, 5. Februar 2021, 15:55:56 CET schrieb Heiko Stübner:
> Hi Sebastian,
> 
> I did some tests myself today as well and can confirm your
> hdmi related finding - at least when plugged in on boot.
> 
> I tried some combinations of camera vs. hdmi and it seems
> really only when hdmi is plugged in on boot

as you can see in v2, it should work now even with hdmi
connected on boot. My patch ignored the grf-clock when
doing the grf-based init.

All clocks are on during boot and I guess the hdmi-driver
did disable it after its probe. The phy_power_on functions
did handle it correctly already, so it was only happening
with hdmi connected on boot.


Btw. do you plan on submitting your ov13850 driver
soonish?


Heiko


> 
> (1)
> - boot
> - camera
> --> works
> 
> (2)
> - boot
> - camera
> - hdmi plugged in
> - hdmi works
> - camera
> --> works
> 
> (3)
> - hdmi plugged in
> - boot
> - hdmi works
> - camera
> --> camera doesn't work
> 
> (4)
> - boot
> - hdmi plugged in
> - hdmi works
> - camera
> -> camera works
> 
> 
> With a bit of brute-force [0] it seems the camera also works again even
> with hdmi connected on boot. So conclusion would be that some clock
> is misbehaving.
> 
> Now we'll "only" need to find out which one that is.
> 
> 
> Heiko
> 
> 
> [0]
> Don't disable any clock gates
> 
> diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c
> index 070dc47e95a1..8daf1fc3388c 100644
> --- a/drivers/clk/clk-gate.c
> +++ b/drivers/clk/clk-gate.c
> @@ -61,6 +61,9 @@ static void clk_gate_endisable(struct clk_hw *hw, int enable)
>  
>         set ^= enable;
>  
> +if (!enable)
> +return;
> +
>         if (gate->lock)
>                 spin_lock_irqsave(gate->lock, flags);
>         else
> 
> 
> 
> Am Freitag, 5. Februar 2021, 09:15:47 CET schrieb Heiko Stübner:
> > Hi Sebastian,
> > 
> > Am Freitag, 5. Februar 2021, 07:43:35 CET schrieb Sebastian Fricke:
> > > On 03.02.2021 20:54, Heiko Stübner wrote:
> > > >Am Mittwoch, 3. Februar 2021, 19:14:22 CET schrieb Sebastian Fricke:
> > > >> I have tested your patch set on my nanoPC-T4, here is a complete log
> > > >> with:
> > > >> - relevant kernel log entries
> > > >> - system information
> > > >> - media ctl output
> > > >> - sysfs entry information
> > > >>
> > > >> https://paste.debian.net/1183874/
> > > >>
> > > >> Additionally, to your patchset I have applied the following patches:
> > > >> https://github.com/initBasti/Linux_kernel_media_tree_fork/commits/dual_cam_setup
> > > >>
> > > >> And just to not cause confusion the `media_dev` entries come from this
> > > >> unmerged series:
> > > >> https://patchwork.kernel.org/project/linux-media/list/?series=426269
> > > >>
> > > >> I have actually been able to stream with both of my cameras at the same
> > > >> time using the libcamera cam command.
> > > >> I would like to thank you a lot for making this possible.
> > > >
> > > >Thanks for testing a dual camera setup. On my board I could only test
> > > >the second ISP. And really glad it works for you tool :-) .
> > > >
> > > >Out of curiosity, do you also see that green tint in the images the cameras
> > > >produce?
> > > 
> > > Yes, I do. Actually, I currently have two forms of a green tint, on my
> > > OV13850 everything is quite dark and greenish, which is caused by the
> > > missing 3A algorithms. On my OV4689, I have big patches of the image
> > > with bright green color and flickering, I investigated if this is
> > > connected to the 2nd ISP instance, but that doesn't seem to be the case
> > > as I have the same results when I switch the CSI ports of the cameras.
> > > 
> > > I have found another issue, while testing I discovered following
> > > issue:
> > > When I start the system with an HDMI monitor connected, then the camera
> > > on the 2nd port doesn't work. This is probably because the RX/TX is
> > > reserved as a TX.
> > > But it made me wonder because if the system has an RX, a TX, and
> > > an RX/TX, why isn't the pure TX used by the monitor and the
> > > cameras take RX and RX/TX?
> > > Or do you think that this is maybe a malfunction of this patch?
> > 
> > I don't think it is an issue with this specific series, but still puzzling.
> > 
> > I.e. the DPHYs are actually only relevant to the DSI controllers,
> > with TX0 being connected to DSI0 and TX1RX1 being connected
> > to DSI1. So having an hdmi display _in theory_ shouldn't matter at all.
> > 
> > Out of curiosity what happens, when you boot without hdmi connected
> > turn on the cameras, connect the hdmi after this, try the cameras again?
> > 
> > 
> > Heiko
> > 
> > > 
> > > >
> > > >Thanks
> > > >Heiko
> > > 
> > > Greetings,
> > > Sebastian
> > > 
> > > >
> > > >
> > > >> If you like to you can add:
> > > >> Tested-by: Sebastian Fricke <sebastian.fricke@posteo.net>
> > > >>
> > > >> On 02.02.2021 15:56, Heiko Stuebner wrote:
> > > >> >The rk3399 has two ISPs and right now only the first one is usable.
> > > >> >The second ISP is connected to the TXRX dphy on the soc.
> > > >> >
> > > >> >The phy of ISP1 is only accessible through the DSI controller's
> > > >> >io-memory, so this series adds support for simply using the dsi
> > > >> >controller is a phy if needed.
> > > >> >
> > > >> >That solution is needed at least on rk3399 and rk3288 but no-one
> > > >> >has looked at camera support on rk3288 at all, so right now
> > > >> >only implement the rk3399 specifics.
> > > >> >
> > > >> >
> > > >> >Heiko Stuebner (6):
> > > >> >  drm/rockchip: dsi: add own additional pclk handling
> > > >> >  dt-bindings: display: rockchip-dsi: add optional #phy-cells property
> > > >> >  drm/rockchip: dsi: add ability to work as a phy instead of full dsi
> > > >> >  arm64: dts: rockchip: add #phy-cells to mipi-dsi1
> > > >> >  arm64: dts: rockchip: add cif clk-control pinctrl for rk3399
> > > >> >  arm64: dts: rockchip: add isp1 node on rk3399
> > > >> >
> > > >> > .../display/rockchip/dw_mipi_dsi_rockchip.txt |   1 +
> > > >> > arch/arm64/boot/dts/rockchip/rk3399.dtsi      |  39 ++
> > > >> > drivers/gpu/drm/rockchip/Kconfig              |   2 +
> > > >> > .../gpu/drm/rockchip/dw-mipi-dsi-rockchip.c   | 342 ++++++++++++++++++
> > > >> > 4 files changed, 384 insertions(+)
> > > >> >
> > > >>
> > > >
> > > >
> > > >
> > > >
> > > 
> > 
> > 
> 
>