Adding set_blob ioctl to DRM

Hi All,

I am working on enabling a Color Enhancement block for primary display for Exynos SoC. I need to set a bunch of parameters like Color Conversion matrix, Contrast Improvement parameters etc ~ 30 parameters from User Space.

I am planning to use KDS blob property to receive these parameters. Currently drivers are not allowed to create a blob property inside drm. Neither, user space can set the blob. There is no ioctl provided for same.

How about adding set_blob ioctl in DRM? It seems purposely dropped till now. Please help me in understanding explains the rationale.

What alternatives do I have inside drm to set multiple parameters otherwise? (other than Exynos specific ioctls)

Please guide me.

Regards, Rahul Sharma.