Re: [PATCH] Revert "video: fbdev: amba-clcd: Retire elder CLCD driver"

On Tue, Sep 29, 2020 at 8:44 PM Daniel Vetter [off-list ref] wrote:

On Tue, Sep 29, 2020 at 7:49 PM Peter Collingbourne [off-list ref] wrote:

But aside from all this, why is this blocking the migration from fbdev
to drm? With fbdev you don't have buffer allocations, nor dma-buf
support, and somehow android can boot.

I do not know how Android does things these days but back in the
days it would request a virtual framebuffer twice the height of the
physical framebuffer and then pan that up/down between composing
frames, thus achieving a type of double-buffering from userspace.

Given the type of bugs Peter is seeing this seems to still be the
case, Peter can you confirm?

Yours,
Linus Walleij

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