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Subject: Re: [PATCH v7 00/13] CSI2RX support on J721E
From:   Martyn Welch <martyn.welch@collabora.com>
To:     Vaishnav Achath <vaishnav.a@ti.com>, linux-media@vger.kernel.org,
        devicetree@vger.kernel.org, mripard@kernel.org, mchehab@kernel.org,
        robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
        laurent.pinchart@ideasonboard.com, sakari.ailus@linux.intel.com,
        tomi.valkeinen@ideasonboard.com
Cc:     linux-kernel@vger.kernel.org, bparrot@ti.com,
        niklas.soderlund+renesas@ragnatech.se, j-luthra@ti.com,
        devarsht@ti.com, praneeth@ti.com, u-kumar1@ti.com, vigneshr@ti.com,
        nm@ti.com
Date:   Thu, 23 Mar 2023 19:36:18 +0000
In-Reply-To: <20230314115516.667-1-vaishnav.a@ti.com>
References: <20230314115516.667-1-vaishnav.a@ti.com>
Organization: Collabora Ltd.
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On Tue, 2023-03-14 at 17:25 +0530, Vaishnav Achath wrote:
> Hi,
>=20
> 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.
>=20
> This is a V7 of the below V6 series,
> https://lore.kernel.org/all/20220121142904.4091481-1-p.yadav@ti.com/
>=20
> Since Pratyush moved out of TI, I will be working on upstreaming the
> TI CSI2RX wrapper support.
>=20
> Tested on TI's J721E EVM with LI OV5640 sensor module.
> https://gist.github.com/vaishnavachath/f030a257d5b6569817bc9deab1c4fa77
>=20
> Also, Tested on TI AM62-SK with Pcam5C OV5640 module.
> https://gist.github.com/vaishnavachath/ff2605faa92f1a6ab5670426da28ccee
>=20

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=3D/dev/video0 num-buffers=3D10 ! video/x-
raw, width=3D640, height=3D480, format=3DUYVY, framerate=3D30/1 ! jpegenc !
multifilesink location=3Dtest%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

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/
>=20
> 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
> =C2=A0 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()
> =C2=A0 to be used in ti_csi2rx_stop_streaming() and
> ti_csi2rx_start_streaming()
> =C2=A0 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
> =C2=A0 failures during streaming.
>=20
> Changes in v6:
> - Move the lock around the dereference for framefmt in
> =C2=A0 csi2rx_{get,set}_fmt() instead of when we get the pointer.
> - Do not return an error when an unsupported format is set. Instead
> =C2=A0 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
> =C2=A0 it will just return an error if runtime PM is not enabled.
> - Drop transcoding from the commit message.
> - Make csi2rx_media_ops const.
>=20
> Changes in v5:
> - Cleanup notifier in csi2rx_parse_dt() after the call to
> =C2=A0 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
> =C2=A0 value. A positive value can be returned if the phy was already
> =C2=A0 resumed.
> - Do not query the source subdev for format. Use the newly added
> =C2=A0 internal format instead.
> - Make i unsigned.
> - Change %d to %u
> - Add dependency on PHY_CADENCE_DPHY_RX instead of PHY_CADENCE_DPHY
> =C2=A0 since the Rx mode DPHY now has a separate driver.
> - Drop ti_csi2rx_validate_pipeline(). Pipeline validation should be
> done
> =C2=A0 at media_pipeline_start().
> - Do not assign flags.
> - Fix error handling in ti_csi2rx_start_streaming(). Free up vb2
> buffers
> =C2=A0 when media_pipeline_start() fails.
> - Move clock description in comments under the clocks property.
> - Make ports required.
> - Add link validation to cdns-csi2rx driver.
>=20
> Changes in v4:
> - Drop the call to set PHY submode. It is now being done via
> compatible
> =C2=A0 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
> =C2=A0 starting and ending the graph walk respectively.
> - Reduce max frame height and width in enum_framesizes. Currently
> they
> =C2=A0 are set to UINT_MAX but they must be a multiple of step_width, so
> they
> =C2=A0 need to be rounded down. Also, these values are absurdly large
> which
> =C2=A0 causes some userspace applications like gstreamer to trip up. Whil=
e
> it
> =C2=A0 is not generally right to change the kernel for an application bug=
,
> it
> =C2=A0 is not such a big deal here. This change is replacing one set of
> =C2=A0 absurdly large arbitrary values with another set of smaller but
> still
> =C2=A0 absurdly large arbitrary values. Both limits are unlikely to be hi=
t
> in
> =C2=A0 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
> =C2=A0 instead.
> - Drop OV5640 runtime pm patch. It seems to be a bit complicated and
> it
> =C2=A0 is not exactly necessary for this series. Any CSI-2 camera will
> work
> =C2=A0 just fine, OV5640 just happens to be the one I tested with. I don'=
t
> =C2=A0 want it to block this series. I will submit it as a separate patch
> =C2=A0 later.
>=20
> 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
> =C2=A0 and DMA callback don't race on it.
> - Track the current DMA state. It might go idle because of a lack of
> =C2=A0 buffers. This state can be used to restart it if needed.
> - Do not include the current buffer in the pending queue. It is
> slightly
> =C2=A0 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
> =C2=A0 stalled with. Instead, report the error to vb2 and queue the next
> =C2=A0 buffer in the pending queue.
> - DMA gets stalled if we run out of buffers since the callback is the
> =C2=A0 only one that fires subsequent transfers and it is no longer being
> =C2=A0 called. Check for that when queueing buffers and restart DMA if
> =C2=A0 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
> =C2=A0 compatible.
> - Add more constraints for data-lanes property.
>=20
> Changes in v2:
> - Use phy_pm_runtime_get_sync() and phy_pm_runtime_put() before
> making
> =C2=A0 calls to set PHY mode, etc. to make sure it is ready.
> - Use dmaengine_get_dma_device() instead of directly accessing
> =C2=A0 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
>=20
> Pratyush Yadav (13):
> =C2=A0 media: cadence: csi2rx: Unregister v4l2 async notifier
> =C2=A0 media: cadence: csi2rx: Cleanup media entity properly
> =C2=A0 media: cadence: csi2rx: Add get_fmt and set_fmt pad ops
> =C2=A0 media: cadence: csi2rx: Add external DPHY support
> =C2=A0 media: cadence: csi2rx: Soft reset the streams before starting
> capture
> =C2=A0 media: cadence: csi2rx: Set the STOP bit when stopping a stream
> =C2=A0 media: cadence: csi2rx: Fix stream data configuration
> =C2=A0 media: cadence: csi2rx: Populate subdev devnode
> =C2=A0 media: cadence: csi2rx: Add link validation
> =C2=A0 media: ti: Add CSI2RX support for J721E
> =C2=A0 media: dt-bindings: Make sure items in data-lanes are unique
> =C2=A0 media: dt-bindings: Add DT bindings for TI J721E CSI2RX driver
> =C2=A0 media: dt-bindings: Convert Cadence CSI2RX binding to YAML
>=20
> =C2=A0.../devicetree/bindings/media/cdns,csi2rx.txt |=C2=A0 100 --
> =C2=A0.../bindings/media/cdns,csi2rx.yaml=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 176 +++
> =C2=A0.../bindings/media/ti,j721e-csi2rx.yaml=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 |=C2=A0 101 ++
> =C2=A0.../bindings/media/video-interfaces.yaml=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 |=C2=A0=C2=A0=C2=A0 1 +
> =C2=A0MAINTAINERS=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 |=C2=A0=C2=A0=C2=A0 7 +
> =C2=A0drivers/media/platform/cadence/cdns-csi2rx.c=C2=A0 |=C2=A0 273 ++++=
-
> =C2=A0drivers/media/platform/ti/Kconfig=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0 12 +
> =C2=A0drivers/media/platform/ti/Makefile=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0 1 +
> =C2=A0.../media/platform/ti/j721e-csi2rx/Makefile=C2=A0=C2=A0 |=C2=A0=C2=
=A0=C2=A0 2 +
> =C2=A0.../platform/ti/j721e-csi2rx/j721e-csi2rx.c=C2=A0=C2=A0 | 1022
> +++++++++++++++++
> =C2=A010 files changed, 1580 insertions(+), 115 deletions(-)
> =C2=A0delete mode 100644
> Documentation/devicetree/bindings/media/cdns,csi2rx.txt
> =C2=A0create mode 100644
> Documentation/devicetree/bindings/media/cdns,csi2rx.yaml
> =C2=A0create mode 100644 Documentation/devicetree/bindings/media/ti,j721e=
-
> csi2rx.yaml
> =C2=A0create mode 100644 drivers/media/platform/ti/j721e-csi2rx/Makefile
> =C2=A0create mode 100644 drivers/media/platform/ti/j721e-csi2rx/j721e-
> csi2rx.c
>=20