Convert YUYV422 to I420 on i.MX8 (Mini)?

[jonathanolson]

Is it possible to use G2D on the iMX8 to perform YUYV422 -> YUV420P conversion?

On the iMX6, I used the IPU to perform YUV422 -> YUV420P (planar) conversion.  However, the iMX8 (Mini) has dropped the IPU.  Apparently from the i.MX8M Mini datasheet, the G2D module can perform this conversion.

YUV Support:

• Full Multi destination support for converting non-planar YUV formats to planar YUV. It is used in extracting various components from input color into different destination planes

• YUV422 output with alpha blending supported

However, the Freescale libg2d library does not support "multi destination" and gives the following error if G2D_I420 is specified for a destination format.

g2d_blit_2d: Invalid dst format 21!

Is there a newer libg2d library than 6.2.4.p2.3 which supports this "multi destination" format on i.MX8?  Since the output of MIPI-CSI2 can only support YUV422, it's really slow to perform this operation in software.

[jonathanolson]

Yes it does.  I just ran a g2d blit test on a imx8m board a couple days ago which converts i420 images to rgb.  The aarch64 libg2d library does indeed work on imx8m and the g2d unit is documented in the imx8m manual.

[joanxie]

i.mx8M doesn't have 2D gpu,

you can refer to the release note, the libary mx-gpu-g2d-6.2.4.p4.0.bin is for imx6 or imx7, for imx8x imx8 which has 2d gpu, they use the libary named imx-dpu-g2d-6.2.4.p4.0.bin, which means that no g2d from gpu, but for hardware like imx8qm and imx8qxp, g2d api is still there, but no from gpu, it is api from dpu.

[joanxie]

i.mx8M doesn't support gpu 2d