Re: RkISP1 simulataneously streaming with two cameras

["Heiko Stübner" <heiko@sntech.de>]

Am Montag, 18. Januar 2021, 22:41:19 CET schrieb Helen Koike:
> 
> On 1/18/21 3:12 PM, Helen Koike wrote:
> > Hi Sebastian,
> > 
> > On 1/17/21 10:12 AM, Sebastian Fricke wrote:
> >> Hello,
> >>
> >> I am currently trying to figure out how to configure my NanoPC-T4 for
> >> streaming with two cameras at the same time. The cameras are the CAM1320
> >> (OV13850) and the MCAM40(OV4689), I have ported the drivers from the
> >> downstream BSP Kernel to the current 5.11 rc1 kernel.
> >> My current attempt is to enable the second instance of the RkISP1, the
> >> mipi_dphy_tx1rx1 and setup the OV13850 on i2c1 and the OV4689 on the
> > 
> > The driver phy-rockchip-dphy-rx0.c doesn't support tx1rx1.
> 
> In case you are interested, it seems to be supported by the downstream
> driver:
> 
>     https://github.com/rockchip-linux/kernel/blob/develop-4.4/drivers/phy/rockchip/phy-rockchip-mipi-rx.c

I also did start implementing how I think this could look last year, though never
got it to work at the time.

Relevant code is at:
	https://github.com/mmind/linux-rockchip/commits/wip/tc358749

especially:
	https://github.com/mmind/linux-rockchip/commit/e0d4b03976d2aab85a8c1630be937ea003b5df88

which allows dsi1 to act like a phy instead as it contains the controls
for the tx1rx1 dphy.


Though I can't say if and when I'll revisit this myself again.


Heiko

> 
> Adding support for it upstream would be more then welcome :)
> We didn't add it when we merged because we didn't have hw to test it.
> 
> Thanks!
> Helen
> 
> > 
> > Regards,
> > Helen
> > 
> >> i2c2.
> >> The patch that I apply in this case is the following:
> >> https://github.com/initBasti/Linux_kernel_media_tree_fork/commit/9a8e594a660d67f3790da32f3268bebd3d233526> 
> >> Here is the dmesg ouput when I start the kernel with this patch:
> >> ```
> >> [    7.021079] mc: Linux media interface: v0.10
> >> ...
> >> [    7.084369] videodev: Linux video capture interface: v2.00
> >> ...
> >> [    7.125911] ov4689 2-0036: driver version: 00.01.01
> >> [    7.125939] ov4689 2-0036: could not get module information!
> >> [    7.130037] ov4689 2-0036: Unexpected sensor id(000000), ret(-5)
> >> ...
> >> [    7.143951] ov13850 1-0010: driver version: 00.01.01
> >> [    7.143980] ov13850 1-0010: could not get module information!
> >> [    7.149127] ov13850 1-0010: Detected OV00d850 sensor, REVISION 0xb1
> >> ...
> >> [    7.259601] rkisp1 ff910000.isp0: Adding to iommu group 4
> >> [    7.260911] rkisp1: registered rkisp1_mainpath as /dev/video1
> >> [    7.261100] rkisp1: registered rkisp1_selfpath as /dev/video2
> >> ...
> >> [    7.262628] rkisp1 ff910000.isp0: registered ep id 0 with 2 lanes
> >> [    7.263666] rkvdec ff660000.video-codec: Adding to iommu group 1
> >> [    7.265120] rkisp1 ff910000.isp0: Async subdev notifier completed
> >> [    7.265458] rkisp1 ff920000.isp1: Adding to iommu group 5
> >> [    7.266441] rkisp1: registered rkisp1_mainpath as /dev/video6
> >> [    7.267380] rkisp1: registered rkisp1_selfpath as /dev/video7
> >> [    7.267945] rkisp1 ff920000.isp1: registered ep id 0 with 2 lanes
> >> [    7.267994] debugfs: Directory 'rkisp1' with parent '/' already present!
> >> ```
> >>
> >> And here is the long version of the log with pinctrl and gpio debug
> >> output. https://paste.debian.net/1181487/
> >>
> >> These are the drivers that I use:
> >> OV13850: https://github.com/initBasti/Linux_kernel_media_tree_fork/blob/dual_cam/drivers/media/i2c/ov13850.c
> >> OV4689: https://github.com/initBasti/Linux_kernel_media_tree_fork/blob/dual_cam/drivers/media/i2c/ov4689.c
> >>
> >> I have the following questions:
> >> 1. Within the mipi_dphy_tx1rx1, I chose the phy-cells value to be `<0>`, but I have to say I am not entirely sure about this value. My current research was within the Documentation/devicetree/bindings/phy folder where I was able to find:
> >>> #phy-cells:    Number of cells in a PHY specifier;  The meaning of all
> >>> those cells is defined by the binding for the phy node. The PHY
> >>> provider can use the values in cells to find the appropriate PHY.
> >> But as there is only a binding for the rx0, I felt like I had to guess.
> >> Could someone give me a hint in the right direction?
> >>
> >> 2. Both ISP instances try to acquire the same endpoint 0, I found out
> >> within the code at `rkisp1-dev.c:257`, that the rkisp1 driver tries to
> >> get the endpoint from the firmware node at port 0. Looking deeper into
> >> the code I can see that there are multiple debugging messages which
> >> might be useful, how do I enable the debugging output for prints like:
> >> `drivers/media/v4l2-core/v4l2-fwnode.c:419` ? I already enabled
> >> CONFIG_DEBUG_KERNEL & CONFIG_DEBUG_MISC & CONFIG_DYNAMIC_DEBUG
> >>
> >> 3. Is it correct when two camera sensors try to multiplex the
> >> cif-clkout-a pinctrl? I have taken this from the friendlyElec fork of
> >> the rockchip BSP downstream kernel. https://github.com/friendlyarm/kernel-rockchip/blob/nanopi4-linux-v4.4.y/arch/arm64/boot/dts/rockchip/rk3399-nanopi4-rkisp1.dtsi#L30
> >> I have been testing on of their official images and there the dual mipi setup works.
> >> So, I currently ask myself has something significantly changed in this
> >> part of the code that I am unaware of?
> >> And also I have a really hard time figuring out, where the cif-clkout-a
> >> pinctrl is actually used.
> >>
> >> 4. Has anyone been able to set up the dual cam setup on the rkisp1 on an
> >> upstream kernel? If yes how did you do it?
> >>
> >> Greetings,
> >> Sebastian
>