Message-ID: <ba19a5808b9e5c1b465e111ba698adbfb741dcc6.camel@collabora.com>
Date:   Wed, 29 Mar 2023 16:17:45 +0100
From:   Martyn Welch <martyn.welch@...labora.com>
To:     Jai Luthra <j-luthra@...com>
Cc:     Vaishnav Achath <vaishnav.a@...com>, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, mripard@...nel.org, mchehab@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        laurent.pinchart@...asonboard.com, sakari.ailus@...ux.intel.com,
        tomi.valkeinen@...asonboard.com, linux-kernel@...r.kernel.org,
        bparrot@...com, niklas.soderlund+renesas@...natech.se,
        devarsht@...com, praneeth@...com, u-kumar1@...com, vigneshr@...com,
        nm@...com
Subject: Re: [PATCH v7 00/13] CSI2RX support on J721E

On Tue, 2023-03-28 at 11:31 +0530, Jai Luthra wrote:
> Hi Martyn,
> 
> Thanks for the tests.
> 
> On Mar 23, 2023 at 19:36:18 +0000, Martyn Welch wrote:
> > On Tue, 2023-03-14 at 17:25 +0530, Vaishnav Achath wrote:
> > > Hi,
> > > 
> > > This series adds support for CSI2 capture on J721E. It includes
> > > some
> > > fixes to the Cadence CSI2RX driver, and adds the TI CSI2RX
> > > wrapper
> > > driver.
> > > 
> > > This is a V7 of the below V6 series,
> > > https://lore.kernel.org/all/20220121142904.4091481-1-p.yadav@ti.com/
> > > 
> > > Since Pratyush moved out of TI, I will be working on upstreaming
> > > the
> > > TI CSI2RX wrapper support.
> > > 
> > > Tested on TI's J721E EVM with LI OV5640 sensor module.
> > > https://gist.github.com/vaishnavachath/f030a257d5b6569817bc9deab1c4fa77
> > > 
> > > Also, Tested on TI AM62-SK with Pcam5C OV5640 module.
> > > https://gist.github.com/vaishnavachath/ff2605faa92f1a6ab5670426da28ccee
> > > 
> > 
> > Hi Vaishnav,
> > 
> > I assume I'm doing something wrong. I have a TI AM62-SK and the
> > Pcam5C
> > OV5640 module. I've been trying to test this with gstreamer using
> > the
> > following command:
> > 
> > gst-launch-1.0 -v v4l2src device=/dev/video0 num-buffers=10 !
> > video/x-
> > raw, width=640, height=480, format=UYVY, framerate=30/1 ! jpegenc !
> > multifilesink location=test%d.jpg
> > 
> > However I've not been able to get this working, failing with this
> > failure unless I patch in some changes I found in the TI BSP:
> > 
> > [   28.083635] cdns-mipi-dphy-rx 30110000.phy: DPHY wait for lane
> > ready
> > timeout
> > [   28.090905] cdns-csi2rx 30101000.csi-bridge: Failed to configure
> > external DPHY: -110
> 
> That is expected as currently the DPHY driver does not release the SW
> reset which all SoCs since J721E SR1.0 expect. See the patch linked
> by 
> Vaishnav below.
> 

Ah! Sorry - somehow missed that...

Yep, with those changes it's working for me, thanks!

Tested-by: Martyn Welch <martyn.welch@...labora.com>

> > 
> > The changes (and the device tree nodes I added, which might be
> > wrong...) can be found here:
> > 
> > https://gitlab.collabora.com/martyn/linux/-/commits/am625-sk-ov5640
> > 
> > Any ideas what I'm doing wrong?
> > 
> > Martyn
> > 
> > > For all newer TI platforms that TI J721E Silicon Revision 1.0,
> > > below
> > > update
> > > to DPHY RX driver is needed:
> > > https://lore.kernel.org/all/20230314073137.2153-1-vaishnav.a@ti.com/
> 
> ^
> 
> With that patch and this series on top of linux-next, I was able to
> get 
> Pcam5C capturing with SK-AM62. Although I did face issues with the 
> sensor framerate and had to revert a few recent sensor commits, not
> sure 
> why exactly yet. But here is the working branch with all the changes:
> https://github.com/jailuthra/linux/commits/b4/csi_single
> 
> Let us know if you face any other issues during your tests.
> 
> > > 
> > > Changes in v7:
> > > - For patch 10/13 ("Add CSI2RX upport for J721E"):
> > > - Fix incorrect value written in SHIM_PSI_CFG0_DST_TAG
> > > - Drop support for 2X8 formats.
> > > - Update maintainer to Vaishnav as Pratyush moved out of TI.
> > > - Address Sakari's review comments:
> > > - Update MAX_HEIGHT_LINES, MAX_WIDTH_BYTES to prevent overflow.
> > > - Assign dma_slave_config during declaration, drop memset().
> > > - dma_release_channel() on slave_config failure.
> > > - provide entity ops for the vdev entity with link_validate().
> > > - mutex_destroy() on ti_csi2rx_probe failure path.
> > > - Drop busy check in remove().
> > > - mutex_destroy() in ti_csi2rx_remove().
> > > - Address Laurent's review comments:
> > > - Update entries in Makefile in alphabetical order.
> > > - include headers in alphabetical order.
> > > - Drop redundant CSI DT defines and use from media/mipi-csi2.h.
> > > - Rename csi_df to csi_dt.
> > > - Drop v4l2_colorspace from ti_csi2rx_fmt and set default in
> > >   ti_csi2rx_v4l2_init()
> > > - Adjust field and not return EINVAL in
> > > ti_csi2rx_try_fmt_vid_cap().
> > > - inline ti_csi2rx_video_register().
> > > - start DMA before starting source subdev.
> > > - move buffer cleanup to separate function
> > > ti_csi2rx_cleanup_buffers()
> > >   to be used in ti_csi2rx_stop_streaming() and
> > > ti_csi2rx_start_streaming()
> > >   failure path.
> > > - Drop VB2_USERPTR, VB2_READ and V4L2_CAP_READWRITE.
> > > - For patch 4/13 ("media: cadence: csi2rx: Add external DPHY
> > > support"):
> > > - Fix multiplier and divider in v4l2_get_link_freq() which caused
> > >   failures during streaming.
> > > 
> > > Changes in v6:
> > > - Move the lock around the dereference for framefmt in
> > >   csi2rx_{get,set}_fmt() instead of when we get the pointer.
> > > - Do not return an error when an unsupported format is set.
> > > Instead
> > >   adjust the code to the first format in the list.
> > > - Drop variable bpp and use fmt->bpp directly.
> > > - Drop variable got_pm. Call phy_pm_runtime_put() unconditionally
> > > since
> > >   it will just return an error if runtime PM is not enabled.
> > > - Drop transcoding from the commit message.
> > > - Make csi2rx_media_ops const.
> > > 
> > > Changes in v5:
> > > - Cleanup notifier in csi2rx_parse_dt() after the call to
> > >   v4l2_async_nf_add_fwnode_remote().
> > > - Use YUV 1X16 formats instead of 2X8.
> > > - Only error out when phy_pm_runtime_get_sync() returns a
> > > negative
> > >   value. A positive value can be returned if the phy was already
> > >   resumed.
> > > - Do not query the source subdev for format. Use the newly added
> > >   internal format instead.
> > > - Make i unsigned.
> > > - Change %d to %u
> > > - Add dependency on PHY_CADENCE_DPHY_RX instead of
> > > PHY_CADENCE_DPHY
> > >   since the Rx mode DPHY now has a separate driver.
> > > - Drop ti_csi2rx_validate_pipeline(). Pipeline validation should
> > > be
> > > done
> > >   at media_pipeline_start().
> > > - Do not assign flags.
> > > - Fix error handling in ti_csi2rx_start_streaming(). Free up vb2
> > > buffers
> > >   when media_pipeline_start() fails.
> > > - Move clock description in comments under the clocks property.
> > > - Make ports required.
> > > - Add link validation to cdns-csi2rx driver.
> > > 
> > > Changes in v4:
> > > - Drop the call to set PHY submode. It is now being done via
> > > compatible
> > >   on the DPHY side.
> > > - Acquire the media device's graph_mutex before starting the
> > > graph
> > > walk.
> > > - Call media_graph_walk_init() and media_graph_walk_cleanup()
> > > when
> > >   starting and ending the graph walk respectively.
> > > - Reduce max frame height and width in enum_framesizes. Currently
> > > they
> > >   are set to UINT_MAX but they must be a multiple of step_width,
> > > so
> > > they
> > >   need to be rounded down. Also, these values are absurdly large
> > > which
> > >   causes some userspace applications like gstreamer to trip up.
> > > While
> > > it
> > >   is not generally right to change the kernel for an application
> > > bug,
> > > it
> > >   is not such a big deal here. This change is replacing one set
> > > of
> > >   absurdly large arbitrary values with another set of smaller but
> > > still
> > >   absurdly large arbitrary values. Both limits are unlikely to be
> > > hit
> > > in
> > >   practice.
> > > - Add power-domains property.
> > > - Drop maxItems from clock-names.
> > > - Drop the type for data-lanes.
> > > - Drop uniqueItems from data-lanes. Move it to video-
> > > interfaces.yaml
> > >   instead.
> > > - Drop OV5640 runtime pm patch. It seems to be a bit complicated
> > > and
> > > it
> > >   is not exactly necessary for this series. Any CSI-2 camera will
> > > work
> > >   just fine, OV5640 just happens to be the one I tested with. I
> > > don't
> > >   want it to block this series. I will submit it as a separate
> > > patch
> > >   later.
> > > 
> > > Changes in v3:
> > > - Use v4l2_get_link_freq() to calculate pixel clock.
> > > - Move DMA related fields in struct ti_csi2rx_dma.
> > > - Protect DMA buffer queue with a spinlock to make sure the queue
> > > buffer
> > >   and DMA callback don't race on it.
> > > - Track the current DMA state. It might go idle because of a lack
> > > of
> > >   buffers. This state can be used to restart it if needed.
> > > - Do not include the current buffer in the pending queue. It is
> > > slightly
> > >   better modelling than leaving it at the head of the pending
> > > queue.
> > > - Use the buffer as the callback argument, and add a reference to
> > > csi
> > > in it.
> > > - If queueing a buffer to DMA fails, the buffer gets leaked and
> > > DMA
> > > gets
> > >   stalled with. Instead, report the error to vb2 and queue the
> > > next
> > >   buffer in the pending queue.
> > > - DMA gets stalled if we run out of buffers since the callback is
> > > the
> > >   only one that fires subsequent transfers and it is no longer
> > > being
> > >   called. Check for that when queueing buffers and restart DMA if
> > >   needed.
> > > - Do not put of node until we are done using the fwnode.
> > > - Set inital format to UYVY 640x480.
> > > - Add compatible: contains: const: cdns,csi2rx to allow SoC
> > > specific
> > >   compatible.
> > > - Add more constraints for data-lanes property.
> > > 
> > > Changes in v2:
> > > - Use phy_pm_runtime_get_sync() and phy_pm_runtime_put() before
> > > making
> > >   calls to set PHY mode, etc. to make sure it is ready.
> > > - Use dmaengine_get_dma_device() instead of directly accessing
> > >   dma->device->dev.
> > > - Do not set dst_addr_width when configuring slave DMA.
> > > - Move to a separate subdir and rename to j721e-csi2rx.c
> > > - Convert compatible to ti,j721e-csi2rx.
> > > - Move to use Media Controller centric APIs.
> > > - Improve cleanup in probe when one of the steps fails.
> > > - Add colorspace to formats database.
> > > - Set hw_revision on media_device.
> > > - Move video device initialization to probe time instead of
> > > register
> > > time.
> > > - Rename to ti,j721e-csi2rx.yaml
> > > - Add an entry in MAINTAINERS.
> > > - Add a description for the binding.
> > > - Change compatible to ti,j721e-csi2rx to make it SoC specific.
> > > - Remove description from dmas, reg, power-domains.
> > > - Remove a limit of 2 from #address-cells and #size-cells.
> > > - Fix add ^ to csi-bridge subnode regex.
> > > - Make ranges mandatory.
> > > - Add unit address in example.
> > > - Add a reference to cdns,csi2rx in csi-bridge subnode.
> > > - Expand the example to include the csi-bridge subnode as well.
> > > - Re-order subject prefixes.
> > > - Convert OV5640 to use runtime PM and drop Cadence CSI2RX
> > > s_power
> > > patch.
> > > - Drop subdev call wrappers from cdns-csi2rx.
> > > - Move VPE and CAL to a separate subdir.
> > > - Rename ti-csi2rx.c to j721e-csi2rx.c
> > > 
> > > Pratyush Yadav (13):
> > >   media: cadence: csi2rx: Unregister v4l2 async notifier
> > >   media: cadence: csi2rx: Cleanup media entity properly
> > >   media: cadence: csi2rx: Add get_fmt and set_fmt pad ops
> > >   media: cadence: csi2rx: Add external DPHY support
> > >   media: cadence: csi2rx: Soft reset the streams before starting
> > > capture
> > >   media: cadence: csi2rx: Set the STOP bit when stopping a stream
> > >   media: cadence: csi2rx: Fix stream data configuration
> > >   media: cadence: csi2rx: Populate subdev devnode
> > >   media: cadence: csi2rx: Add link validation
> > >   media: ti: Add CSI2RX support for J721E
> > >   media: dt-bindings: Make sure items in data-lanes are unique
> > >   media: dt-bindings: Add DT bindings for TI J721E CSI2RX driver
> > >   media: dt-bindings: Convert Cadence CSI2RX binding to YAML
> > > 
> > >  .../devicetree/bindings/media/cdns,csi2rx.txt |  100 --
> > >  .../bindings/media/cdns,csi2rx.yaml           |  176 +++
> > >  .../bindings/media/ti,j721e-csi2rx.yaml       |  101 ++
> > >  .../bindings/media/video-interfaces.yaml      |    1 +
> > >  MAINTAINERS                                   |    7 +
> > >  drivers/media/platform/cadence/cdns-csi2rx.c  |  273 ++++-
> > >  drivers/media/platform/ti/Kconfig             |   12 +
> > >  drivers/media/platform/ti/Makefile            |    1 +
> > >  .../media/platform/ti/j721e-csi2rx/Makefile   |    2 +
> > >  .../platform/ti/j721e-csi2rx/j721e-csi2rx.c   | 1022
> > > +++++++++++++++++
> > >  10 files changed, 1580 insertions(+), 115 deletions(-)
> > >  delete mode 100644
> > > Documentation/devicetree/bindings/media/cdns,csi2rx.txt
> > >  create mode 100644
> > > Documentation/devicetree/bindings/media/cdns,csi2rx.yaml
> > >  create mode 100644
> > > Documentation/devicetree/bindings/media/ti,j721e-
> > > csi2rx.yaml
> > >  create mode 100644 drivers/media/platform/ti/j721e-
> > > csi2rx/Makefile
> > >  create mode 100644 drivers/media/platform/ti/j721e-csi2rx/j721e-
> > > csi2rx.c
> > > 
> > 
> 
> Thanks,
> Jai

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