[RFC 0/5] arm64: imx8mm: Enable Hantro VPUs

[Adam Ford]

The i.MX8M has two Hantro video decoders, called G1 and G2 which appear
to be related to the video decoders used on the i.MX8MQ, but because of
how the Mini handles the power domains, the VPU driver does not need to
handle all the functions, so a new compatible flag is required.

The i.MX8MM also has a Hantro video encoder which appears to be similar
to what's already supported in some Rockchip devices.  As part of the
series, some of the video format names are re-named to be more generic.

The VPUs appear as media devices:

Media device information
------------------------
driver          hantro-vpu
model           hantro-vpu
serial          
bus info        platform: hantro-vpu
hw revision     0x0
driver version  5.15.0

Device topology
- entity 1: nxp,imx8mm-vpu-dec-source (1 pad, 1 link)
            type Node subtype V4L flags 0
            device node name /dev/video1
	pad0: Source
		-> "nxp,imx8mm-vpu-dec-proc":0 [ENABLED,IMMUTABLE]

- entity 3: nxp,imx8mm-vpu-dec-proc (2 pads, 2 links)
            type Node subtype Unknown flags 0
	pad0: Sink
		<- "nxp,imx8mm-vpu-dec-source":0 [ENABLED,IMMUTABLE]
	pad1: Source
		-> "nxp,imx8mm-vpu-dec-sink":0 [ENABLED,IMMUTABLE]

- entity 6: nxp,imx8mm-vpu-dec-sink (1 pad, 1 link)
            type Node subtype V4L flags 0
            device node name /dev/video1
	pad0: Sink
		<- "nxp,imx8mm-vpu-dec-proc":1 [ENABLED,IMMUTABLE]



Media device information
------------------------
driver          hantro-vpu
model           hantro-vpu
serial          
bus info        platform: hantro-vpu
hw revision     0x0
driver version  5.15.0

Device topology
- entity 1: nxp,imx8mm-vpu-g2-dec-source (1 pad, 1 link)
            type Node subtype V4L flags 0
            device node name /dev/video2
	pad0: Source
		-> "nxp,imx8mm-vpu-g2-dec-proc":0 [ENABLED,IMMUTABLE]

- entity 3: nxp,imx8mm-vpu-g2-dec-proc (2 pads, 2 links)
            type Node subtype Unknown flags 0
	pad0: Sink
		<- "nxp,imx8mm-vpu-g2-dec-source":0 [ENABLED,IMMUTABLE]
	pad1: Source
		-> "nxp,imx8mm-vpu-g2-dec-sink":0 [ENABLED,IMMUTABLE]

- entity 6: nxp,imx8mm-vpu-g2-dec-sink (1 pad, 1 link)
            type Node subtype V4L flags 0
            device node name /dev/video2
	pad0: Sink
		<- "nxp,imx8mm-vpu-g2-dec-proc":1 [ENABLED,IMMUTABLE]



Media device information
------------------------
driver          hantro-vpu
model           hantro-vpu
serial          
bus info        platform: hantro-vpu
hw revision     0x0
driver version  5.15.0

Device topology
- entity 1: nxp,imx8mm-vpu-h1-enc-source (1 pad, 1 link)
            type Node subtype V4L flags 0
            device node name /dev/video3
	pad0: Source
		-> "nxp,imx8mm-vpu-h1-enc-proc":0 [ENABLED,IMMUTABLE]

- entity 3: nxp,imx8mm-vpu-h1-enc-proc (2 pads, 2 links)
            type Node subtype Unknown flags 0
	pad0: Sink
		<- "nxp,imx8mm-vpu-h1-enc-source":0 [ENABLED,IMMUTABLE]
	pad1: Source
		-> "nxp,imx8mm-vpu-h1-enc-sink":0 [ENABLED,IMMUTABLE]

- entity 6: nxp,imx8mm-vpu-h1-enc-sink (1 pad, 1 link)
            type Node subtype V4L flags 0
            device node name /dev/video3
	pad0: Sink
		<- "nxp,imx8mm-vpu-h1-enc-proc":1 [ENABLED,IMMUTABLE]

This is an RFC because I don't have functional video on my system yet,
and I'm hoping there might be people who do and can help test this.
I have only tested this far enough to see they enumerate and appear
as /dev/videoX and /dev/mediaX devices.

I am also curious to know if/what gstreamer plugins are necessary.  In
NXP's custom kernel, there are IMX-specific plugins, and I was hoping there
would be more generic plugins that I can use to test.  I am hoping some
of the linux-media experts might chime in on how to best test.

Lastly, I didn't update any device tree binding YAML files, because
I know there have been some discussions about the power domains on the
imx8mq, and I wasn't sure if the imx8mm should get a separate YAML file
or if the existing one for te imx8mq should just be modified.

This will likely require the following series in order to apply correctly:
https://patchwork.kernel.org/project/linux-arm-kernel/list/?series=576407

Adam Ford (5):
  media: hantro: Add support for i.MX8M Mini
  arm64: dts: imx8mm:  Enable VPU-G1 and VPU-G2
  media: hantro: Rename ROCKCHIP_VPU_ENC_FMT to HANTRO_VPU_ENC_FMT
  media: hantro: Add H1 encoder support on i.MX8M Mini
  arm64: dts: imx8mm:  Enable Hantro H1 Encoder

 arch/arm64/boot/dts/freescale/imx8mm.dtsi     |  61 ++++++++
 drivers/staging/media/hantro/hantro_drv.c     |   3 +
 drivers/staging/media/hantro/hantro_hw.h      |  19 ++-
 drivers/staging/media/hantro/imx8m_vpu_hw.c   | 143 ++++++++++++++++++
 .../staging/media/hantro/rockchip_vpu_hw.c    |  26 ++--
 5 files changed, 231 insertions(+), 21 deletions(-)

-- 
2.32.0