Re: [PATCH RESEND 2/2] arm64: dts: rockchip: Add RGA2 support to rk356x

Hi, Michael,

I don't think the GFP_DMA32 flag works with DmaBuf import. The buffer may be
allocated by some other driver that is able to address more than 4G and
imported into the RGA driver. In this case, limiting the allocations is not
enough, but we would still need error handling in the map function for buffers
that cannot be addressed by the RGA.

I guess we need both, a limit for the allocation and error checking for the
map.

Maybe you are right.. I haven't digged into v4l2-m2m API, so I'm not 
sure about

it. Seems we need others' help.

Shengyu