Il 15/02/23 07:25, Yong Wu ha scritto:

As the removed property in the vcodec dt-binding, the property is:
dma-ranges = <0x1 0x0 0x0 0x40000000 0x0 0xfff00000>;

The length is 0xfff0_0000 rather than 0x1_0000_0000, this means it
requires 1M as a gap. This is because the end address for some vcodec
HW is (address + size). If the size is 4G, the end address may be
0x2_0000_0000, and the width for vcodec register only is 32, then the
HW may get the ZERO address.

Currently the consumer's dma-ranges property doesn't work, IOMMU
has to consider this case. Add a bigger gap(8M) for all the regions
to avoid it.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
Hi AngeloGioacchino,
I define a new macro for this, I think it is a small change, thus keep
you R-b.
Thanks.

Hello!
You added a nice comment to the new definition describing that there's a 8M gap,
so it's completely fine; you can keep my R-b on this one just fine!

Regards,
Angelo

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