Re: [PATCH v15 00/13] amphion video decoder/encoder driver

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On 25/01/2022 13:07, Hans Verkuil wrote:
> Hi Ming,
> 
> Can you take a look at the kernel test robot warnings? I suspect you're missing
> a header (linux/vmalloc.h?) for vzalloc et al that the alpha architecture doesn't
> automatically include.
> 
> If it is just adding a single include in a single patch, then just post a 15.1 for
> that patch. If it is more complicated, then posting a v16 is easier.

Follow up: checkpatch.pl --strict is now OK, and so are sparse and smatch. So it's
just this and an Ack for the firmware patch that needs to be resolved.

Regards,

	Hans

> 
> Regards,
> 
> 	Hans
> 
> On 25/01/2022 08:11, Ming Qian wrote:
>> Hi all,
>>
>> This patch series adds support for
>> the amphion video encoder and decoder
>> via the VPU block present in imx8q platforms.
>> Currently, support for IMX8QXP and IMX8QM is included.
>>
>> It features decoding for the following formats:
>> - H.264
>> - HEVC
>> - MPEG4
>> - MPEG2
>> - VC1
>> - VP8
>>
>> It features encoding for the following formats:
>> - H.264
>>
>> The driver creates a separate device node for the encoder and decoder.
>>
>> This driver is dependent on vpu firmwares.
>> The firmwares have been submitted to linux-firmware.
>> The firmware patch is since commit
>> b563148fd28623f6b6ce68bb06c3dd3bd138b058:
>> linux-firmware: Update firmware file for Intel Bluetooth 9462
>> (Fri Oct 8 16:30:14 2021 +0530)
>>
>> and it's available in the git repository at:
>>     https://github.com/mingqian-0/linux-firmware.git
>>
>> for you to fetch changes up to bb3eee4f99589d4910dee4c053a3a685546b5dbb:
>> amphion: add VPU firmwares for NXP i.MX8Q SoCs
>> (Tue Oct 12 15:09:57 2021 +0800)
>>
>> encoder is tested with gstreamer
>> decoder is tested with gstreamer, but the following patches are required:
>> https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1379
>> https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1381
>>
>>
>> Tested-by: Nicolas Dufresne <nicolas.dufresne@xxxxxxxxxxxxx>
>>
>>
>> Changelog:
>>
>> v15
>> - fix issues detected by "checkpatch.pl --strict"
>> - encoder add ctrl V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE
>>
>> v14
>> - fix some errors according to Hans's comments
>>
>> v13
>> - make a workaround that avoid firmware entering wfi wrongly
>>
>> v12
>> - support reset decoder when starting a new stream
>> - don't append an empty last buffer, set last_buffer_dequeued
>> - improve the resolution change flow
>> - return all buffers if start_streaming fail
>> - fill encoder capture buffer's filed to none
>> - fix a bug in calculating bytesperline
>>
>> v11
>> - fix dt_binding_check error after upgrade dtschema
>> - remove "default y"
>> - add media device
>>
>> v10
>> - refine vpu log, remove custom logging infrastructure
>> - support non contiguous planes format nv12m instead of nv12
>> - rename V4L2_PIX_FMT_NV12_8L128 to V4L2_PIX_FMT_NV12MT_8L128
>> - rename V4L2_PIX_FMT_NV12_10BE_8L128 to V4L2_PIX_FMT_NV12MT_10BE_8L128
>> - merge two module into one
>> - fix kernel panic in rmmod
>>
>> v9
>> - drop V4L2_BUF_FLAG_CODECCONFIG
>> - drop V4L2_EVENT_CODEC_ERROR
>> - drop V4L2_EVENT_SKIP - use the v4l2_buffer.sequence counter
>> - fix some build warnings with W=1 reported by kernel test robot
>>
>> v8
>> - move driver from driver/media/platform/imx/vpu-8q to
>>   driver/media/platform/amphion
>> - rename driver name to amphion
>> - remove imx_vpu.h
>> - move the definition of V4L2_EVENT_CODEC_ERROR to videodev2.h
>> - move the definition of V4L2_EVENT_SKIP to videodev2.h
>>
>> v7
>> - fix build warnings with W=1 reported by kernel test robot
>>
>> v6:
>> - rename V4L2_PIX_FMT_NT8 to V4L2_PIX_FMT_NV12_8L128
>> - rename V4L2_PIX_FMT_NT10 to V4L2_PIX_FMT_NV12_10BE_8L128
>>
>> v5:
>> - move some definition from imx_vph.h to videodev2.h
>> - remove some unnecessary content
>> - add some documentation descriptions
>> - pass the lateset v4l2-compliance test
>>
>> v4:
>> - redefine the memory-region in devicetree bindings documentation
>> - use v4l2's mechanism to implement synchronize queuing ioctl
>> - remove the unnecessary mutex ioctl_sync
>> - don't notify source change event if the parameters are same as previously established
>> - add flag V4L2_FMT_FLAG_DYN_RESOLUTION to decoder's capture format
>>
>> v3:
>> - don't make vpu device node a simple-bus
>> - trigger probing vpu core in the driver
>> - remove unnecessary vpu core index property
>>
>> v2:
>> - fix dt bindings build error
>> - split driver patch into several parts to avoid exceeding bytes limit
>>
>> Compliance
>> ==========
>> # v4l2-compliance -d /dev/video0
>> v4l2-compliance 1.21.0-4859, 64 bits, 64-bit time_t
>> v4l2-compliance SHA: 493af03f3c57 2021-10-08 17:23:11
>>
>> Compliance test for amphion-vpu device /dev/video0:
>>
>> Driver Info:
>> 	Driver name      : amphion-vpu
>> 	Card type        : amphion vpu decoder
>> 	Bus info         : platform: amphion-vpu
>> 	Driver version   : 5.15.0
>> 	Capabilities     : 0x84204000
>> 		Video Memory-to-Memory Multiplanar
>> 		Streaming
>> 		Extended Pix Format
>> 		Device Capabilities
>> 	Device Caps      : 0x04204000
>> 		Video Memory-to-Memory Multiplanar
>> 		Streaming
>> 		Extended Pix Format
>> 	Detected Stateful Decoder
>> Media Driver Info:
>> 	Driver name      : amphion-vpu
>> 	Model            : amphion-vpu
>> 	Serial           :
>> 	Bus info         : platform: amphion-vpu
>> 	Media version    : 5.15.0
>> 	Hardware revision: 0x00000000 (0)
>> 	Driver version   : 5.15.0
>> Interface Info:
>> 	ID               : 0x0300000c
>> 	Type             : V4L Video
>> Entity Info:
>> 	ID               : 0x00000001 (1)
>> 	Name             : amphion-vpu-decoder-source
>> 	Function         : V4L2 I/O
>> 	Pad 0x01000002   : 0: Source
>> 	  Link 0x02000008: to remote pad 0x1000004 of entity 'amphion-vpu-decoder-proc' (Video Decoder): Data, Enabled, Immutable
>>
>> Required ioctls:
>> 	test MC information (see 'Media Driver Info' above): OK
>> 	test VIDIOC_QUERYCAP: OK
>> 	test invalid ioctls: OK
>>
>> Allow for multiple opens:
>> 	test second /dev/video0 open: OK
>> 	test VIDIOC_QUERYCAP: OK
>> 	test VIDIOC_G/S_PRIORITY: OK
>> 	test for unlimited opens: OK
>>
>> Debug ioctls:
>> 	test VIDIOC_DBG_G/S_REGISTER: OK (Not Supported)
>> 	test VIDIOC_LOG_STATUS: OK (Not Supported)
>>
>> Input ioctls:
>> 	test VIDIOC_G/S_TUNER/ENUM_FREQ_BANDS: OK (Not Supported)
>> 	test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
>> 	test VIDIOC_S_HW_FREQ_SEEK: OK (Not Supported)
>> 	test VIDIOC_ENUMAUDIO: OK (Not Supported)
>> 	test VIDIOC_G/S/ENUMINPUT: OK (Not Supported)
>> 	test VIDIOC_G/S_AUDIO: OK (Not Supported)
>> 	Inputs: 0 Audio Inputs: 0 Tuners: 0
>>
>> Output ioctls:
>> 	test VIDIOC_G/S_MODULATOR: OK (Not Supported)
>> 	test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
>> 	test VIDIOC_ENUMAUDOUT: OK (Not Supported)
>> 	test VIDIOC_G/S/ENUMOUTPUT: OK (Not Supported)
>> 	test VIDIOC_G/S_AUDOUT: OK (Not Supported)
>> 	Outputs: 0 Audio Outputs: 0 Modulators: 0
>>
>> Input/Output configuration ioctls:
>> 	test VIDIOC_ENUM/G/S/QUERY_STD: OK (Not Supported)
>> 	test VIDIOC_ENUM/G/S/QUERY_DV_TIMINGS: OK (Not Supported)
>> 	test VIDIOC_DV_TIMINGS_CAP: OK (Not Supported)
>> 	test VIDIOC_G/S_EDID: OK (Not Supported)
>>
>> Control ioctls:
>> 	test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: OK
>> 	test VIDIOC_QUERYCTRL: OK
>> 	test VIDIOC_G/S_CTRL: OK
>> 	test VIDIOC_G/S/TRY_EXT_CTRLS: OK
>> 	test VIDIOC_(UN)SUBSCRIBE_EVENT/DQEVENT: OK
>> 	test VIDIOC_G/S_JPEGCOMP: OK (Not Supported)
>> 	Standard Controls: 3 Private Controls: 0
>>
>> Format ioctls:
>> 	test VIDIOC_ENUM_FMT/FRAMESIZES/FRAMEINTERVALS: OK
>> 	test VIDIOC_G/S_PARM: OK (Not Supported)
>> 	test VIDIOC_G_FBUF: OK (Not Supported)
>> 	test VIDIOC_G_FMT: OK
>> 	test VIDIOC_TRY_FMT: OK
>> 	test VIDIOC_S_FMT: OK
>> 	test VIDIOC_G_SLICED_VBI_CAP: OK (Not Supported)
>> 	test Cropping: OK (Not Supported)
>> 	test Composing: OK
>> 	test Scaling: OK (Not Supported)
>>
>> Codec ioctls:
>> 	test VIDIOC_(TRY_)ENCODER_CMD: OK (Not Supported)
>> 	test VIDIOC_G_ENC_INDEX: OK (Not Supported)
>> 	test VIDIOC_(TRY_)DECODER_CMD: OK
>>
>> Buffer ioctls:
>> 	test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: OK
>> 	test VIDIOC_EXPBUF: OK
>> 	test Requests: OK (Not Supported)
>>
>> Total for amphion-vpu device /dev/video0: 46, Succeeded: 46, Failed: 0, Warnings: 0
>>
>> # v4l2-compliance -d /dev/video1
>> v4l2-compliance 1.21.0-4859, 64 bits, 64-bit time_t
>> v4l2-compliance SHA: 493af03f3c57 2021-10-08 17:23:11
>>
>> Compliance test for amphion-vpu device /dev/video1:
>>
>> Driver Info:
>> 	Driver name      : amphion-vpu
>> 	Card type        : amphion vpu encoder
>> 	Bus info         : platform: amphion-vpu
>> 	Driver version   : 5.15.0
>> 	Capabilities     : 0x84204000
>> 		Video Memory-to-Memory Multiplanar
>> 		Streaming
>> 		Extended Pix Format
>> 		Device Capabilities
>> 	Device Caps      : 0x04204000
>> 		Video Memory-to-Memory Multiplanar
>> 		Streaming
>> 		Extended Pix Format
>> 	Detected Stateful Encoder
>> Media Driver Info:
>> 	Driver name      : amphion-vpu
>> 	Model            : amphion-vpu
>> 	Serial           :
>> 	Bus info         : platform: amphion-vpu
>> 	Media version    : 5.15.0
>> 	Hardware revision: 0x00000000 (0)
>> 	Driver version   : 5.15.0
>> Interface Info:
>> 	ID               : 0x0300001a
>> 	Type             : V4L Video
>> Entity Info:
>> 	ID               : 0x0000000f (15)
>> 	Name             : amphion-vpu-encoder-source
>> 	Function         : V4L2 I/O
>> 	Pad 0x01000010   : 0: Source
>> 	  Link 0x02000016: to remote pad 0x1000012 of entity 'amphion-vpu-encoder-proc' (Video Encoder): Data, Enabled, Immutable
>>
>> Required ioctls:
>> 	test MC information (see 'Media Driver Info' above): OK
>> 	test VIDIOC_QUERYCAP: OK
>> 	test invalid ioctls: OK
>>
>> Allow for multiple opens:
>> 	test second /dev/video1 open: OK
>> 	test VIDIOC_QUERYCAP: OK
>> 	test VIDIOC_G/S_PRIORITY: OK
>> 	test for unlimited opens: OK
>>
>> Debug ioctls:
>> 	test VIDIOC_DBG_G/S_REGISTER: OK (Not Supported)
>> 	test VIDIOC_LOG_STATUS: OK (Not Supported)
>>
>> Input ioctls:
>> 	test VIDIOC_G/S_TUNER/ENUM_FREQ_BANDS: OK (Not Supported)
>> 	test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
>> 	test VIDIOC_S_HW_FREQ_SEEK: OK (Not Supported)
>> 	test VIDIOC_ENUMAUDIO: OK (Not Supported)
>> 	test VIDIOC_G/S/ENUMINPUT: OK (Not Supported)
>> 	test VIDIOC_G/S_AUDIO: OK (Not Supported)
>> 	Inputs: 0 Audio Inputs: 0 Tuners: 0
>>
>> Output ioctls:
>> 	test VIDIOC_G/S_MODULATOR: OK (Not Supported)
>> 	test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
>> 	test VIDIOC_ENUMAUDOUT: OK (Not Supported)
>> 	test VIDIOC_G/S/ENUMOUTPUT: OK (Not Supported)
>> 	test VIDIOC_G/S_AUDOUT: OK (Not Supported)
>> 	Outputs: 0 Audio Outputs: 0 Modulators: 0
>>
>> Input/Output configuration ioctls:
>> 	test VIDIOC_ENUM/G/S/QUERY_STD: OK (Not Supported)
>> 	test VIDIOC_ENUM/G/S/QUERY_DV_TIMINGS: OK (Not Supported)
>> 	test VIDIOC_DV_TIMINGS_CAP: OK (Not Supported)
>> 	test VIDIOC_G/S_EDID: OK (Not Supported)
>>
>> Control ioctls:
>> 	test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: OK
>> 	test VIDIOC_QUERYCTRL: OK
>> 	test VIDIOC_G/S_CTRL: OK
>> 	test VIDIOC_G/S/TRY_EXT_CTRLS: OK
>> 	test VIDIOC_(UN)SUBSCRIBE_EVENT/DQEVENT: OK
>> 	test VIDIOC_G/S_JPEGCOMP: OK (Not Supported)
>> 	Standard Controls: 20 Private Controls: 0
>>
>> Format ioctls:
>> 	test VIDIOC_ENUM_FMT/FRAMESIZES/FRAMEINTERVALS: OK
>> 	test VIDIOC_G/S_PARM: OK
>> 	test VIDIOC_G_FBUF: OK (Not Supported)
>> 	test VIDIOC_G_FMT: OK
>> 	test VIDIOC_TRY_FMT: OK
>> 	test VIDIOC_S_FMT: OK
>> 	test VIDIOC_G_SLICED_VBI_CAP: OK (Not Supported)
>> 	test Cropping: OK
>> 	test Composing: OK (Not Supported)
>> 	test Scaling: OK (Not Supported)
>>
>> Codec ioctls:
>> 	test VIDIOC_(TRY_)ENCODER_CMD: OK
>> 	test VIDIOC_G_ENC_INDEX: OK (Not Supported)
>> 	test VIDIOC_(TRY_)DECODER_CMD: OK (Not Supported)
>>
>> Buffer ioctls:
>> 	test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: OK
>> 	test VIDIOC_EXPBUF: OK
>> 	test Requests: OK (Not Supported)
>>
>> Total for amphion-vpu device /dev/video1: 46, Succeeded: 46, Failed: 0, Warnings: 0
>>
>> # v4l2-compliance -d /dev/media0
>> v4l2-compliance 1.21.0-4859, 64 bits, 64-bit time_t
>> v4l2-compliance SHA: 493af03f3c57 2021-10-08 17:23:11
>>
>> Compliance test for amphion-vpu device /dev/media0:
>>
>> Media Driver Info:
>> 	Driver name      : amphion-vpu
>> 	Model            : amphion-vpu
>> 	Serial           :
>> 	Bus info         : platform: amphion-vpu
>> 	Media version    : 5.15.0
>> 	Hardware revision: 0x00000000 (0)
>> 	Driver version   : 5.15.0
>>
>> Required ioctls:
>> 	test MEDIA_IOC_DEVICE_INFO: OK
>> 	test invalid ioctls: OK
>>
>> Allow for multiple opens:
>> 	test second /dev/media0 open: OK
>> 	test MEDIA_IOC_DEVICE_INFO: OK
>> 	test for unlimited opens: OK
>>
>> Media Controller ioctls:
>> 	test MEDIA_IOC_G_TOPOLOGY: OK
>> 	Entities: 6 Interfaces: 2 Pads: 8 Links: 8
>> 	test MEDIA_IOC_ENUM_ENTITIES/LINKS: OK
>> 	test MEDIA_IOC_SETUP_LINK: OK
>>
>> Total for amphion-vpu device /dev/media0: 8, Succeeded: 8, Failed: 0, Warnings: 0
>>
>> Ming Qian (13):
>>   dt-bindings: media: amphion: add amphion video codec bindings
>>   media: add nv12m_8l128 and nv12m_10be_8l128 video format.
>>   media: amphion: add amphion vpu device driver
>>   media: amphion: add vpu core driver
>>   media: amphion: implement vpu core communication based on mailbox
>>   media: amphion: add vpu v4l2 m2m support
>>   media: amphion: add v4l2 m2m vpu encoder stateful driver
>>   media: amphion: add v4l2 m2m vpu decoder stateful driver
>>   media: amphion: implement windsor encoder rpc interface
>>   media: amphion: implement malone decoder rpc interface
>>   ARM64: dts: freescale: imx8q: add imx vpu codec entries
>>   firmware: imx: scu-pd: imx8q: add vpu mu resources
>>   MAINTAINERS: add AMPHION VPU CODEC V4L2 driver entry
>>
>>  .../bindings/media/amphion,vpu.yaml           |  180 ++
>>  .../media/v4l/pixfmt-yuv-planar.rst           |   28 +-
>>  MAINTAINERS                                   |    9 +
>>  .../arm64/boot/dts/freescale/imx8-ss-vpu.dtsi |   72 +
>>  arch/arm64/boot/dts/freescale/imx8qxp-mek.dts |   17 +
>>  arch/arm64/boot/dts/freescale/imx8qxp.dtsi    |   24 +
>>  arch/arm64/configs/defconfig                  |    1 +
>>  drivers/firmware/imx/scu-pd.c                 |    4 +
>>  drivers/media/platform/Kconfig                |   19 +
>>  drivers/media/platform/Makefile               |    2 +
>>  drivers/media/platform/amphion/Makefile       |   20 +
>>  drivers/media/platform/amphion/vdec.c         | 1694 +++++++++++++++++
>>  drivers/media/platform/amphion/venc.c         | 1364 +++++++++++++
>>  drivers/media/platform/amphion/vpu.h          |  356 ++++
>>  drivers/media/platform/amphion/vpu_cmds.c     |  436 +++++
>>  drivers/media/platform/amphion/vpu_cmds.h     |   25 +
>>  drivers/media/platform/amphion/vpu_codec.h    |   68 +
>>  drivers/media/platform/amphion/vpu_color.c    |  183 ++
>>  drivers/media/platform/amphion/vpu_core.c     |  870 +++++++++
>>  drivers/media/platform/amphion/vpu_core.h     |   15 +
>>  drivers/media/platform/amphion/vpu_dbg.c      |  495 +++++
>>  drivers/media/platform/amphion/vpu_defs.h     |  187 ++
>>  drivers/media/platform/amphion/vpu_drv.c      |  260 +++
>>  drivers/media/platform/amphion/vpu_helpers.c  |  413 ++++
>>  drivers/media/platform/amphion/vpu_helpers.h  |   74 +
>>  drivers/media/platform/amphion/vpu_imx8q.c    |  271 +++
>>  drivers/media/platform/amphion/vpu_imx8q.h    |  115 ++
>>  drivers/media/platform/amphion/vpu_malone.c   | 1625 ++++++++++++++++
>>  drivers/media/platform/amphion/vpu_malone.h   |   44 +
>>  drivers/media/platform/amphion/vpu_mbox.c     |  118 ++
>>  drivers/media/platform/amphion/vpu_mbox.h     |   16 +
>>  drivers/media/platform/amphion/vpu_msgs.c     |  385 ++++
>>  drivers/media/platform/amphion/vpu_msgs.h     |   14 +
>>  drivers/media/platform/amphion/vpu_rpc.c      |  257 +++
>>  drivers/media/platform/amphion/vpu_rpc.h      |  456 +++++
>>  drivers/media/platform/amphion/vpu_v4l2.c     |  720 +++++++
>>  drivers/media/platform/amphion/vpu_v4l2.h     |   55 +
>>  drivers/media/platform/amphion/vpu_windsor.c  | 1169 ++++++++++++
>>  drivers/media/platform/amphion/vpu_windsor.h  |   37 +
>>  drivers/media/v4l2-core/v4l2-ioctl.c          |    2 +
>>  include/uapi/linux/videodev2.h                |    2 +
>>  41 files changed, 12099 insertions(+), 3 deletions(-)
>>  create mode 100644 Documentation/devicetree/bindings/media/amphion,vpu.yaml
>>  create mode 100644 arch/arm64/boot/dts/freescale/imx8-ss-vpu.dtsi
>>  create mode 100644 drivers/media/platform/amphion/Makefile
>>  create mode 100644 drivers/media/platform/amphion/vdec.c
>>  create mode 100644 drivers/media/platform/amphion/venc.c
>>  create mode 100644 drivers/media/platform/amphion/vpu.h
>>  create mode 100644 drivers/media/platform/amphion/vpu_cmds.c
>>  create mode 100644 drivers/media/platform/amphion/vpu_cmds.h
>>  create mode 100644 drivers/media/platform/amphion/vpu_codec.h
>>  create mode 100644 drivers/media/platform/amphion/vpu_color.c
>>  create mode 100644 drivers/media/platform/amphion/vpu_core.c
>>  create mode 100644 drivers/media/platform/amphion/vpu_core.h
>>  create mode 100644 drivers/media/platform/amphion/vpu_dbg.c
>>  create mode 100644 drivers/media/platform/amphion/vpu_defs.h
>>  create mode 100644 drivers/media/platform/amphion/vpu_drv.c
>>  create mode 100644 drivers/media/platform/amphion/vpu_helpers.c
>>  create mode 100644 drivers/media/platform/amphion/vpu_helpers.h
>>  create mode 100644 drivers/media/platform/amphion/vpu_imx8q.c
>>  create mode 100644 drivers/media/platform/amphion/vpu_imx8q.h
>>  create mode 100644 drivers/media/platform/amphion/vpu_malone.c
>>  create mode 100644 drivers/media/platform/amphion/vpu_malone.h
>>  create mode 100644 drivers/media/platform/amphion/vpu_mbox.c
>>  create mode 100644 drivers/media/platform/amphion/vpu_mbox.h
>>  create mode 100644 drivers/media/platform/amphion/vpu_msgs.c
>>  create mode 100644 drivers/media/platform/amphion/vpu_msgs.h
>>  create mode 100644 drivers/media/platform/amphion/vpu_rpc.c
>>  create mode 100644 drivers/media/platform/amphion/vpu_rpc.h
>>  create mode 100644 drivers/media/platform/amphion/vpu_v4l2.c
>>  create mode 100644 drivers/media/platform/amphion/vpu_v4l2.h
>>  create mode 100644 drivers/media/platform/amphion/vpu_windsor.c
>>  create mode 100644 drivers/media/platform/amphion/vpu_windsor.h
>>
>>
>> base-commit: e783362eb54cd99b2cac8b3a9aeac942e6f6ac07
> 




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