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SubjectRe: [PATCH] drm: verisilicon: support non-coherent DMA framebuffers
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在 2026-05-05二的 18:25 -0400,Dominique Belhachemi写道:
> On Tue, May 5, 2026 at 5:03 AM Icenowy Zheng
> <zhengxingda@iscas.ac.cn> wrote:
> >
> > 在 2026-05-05二的 04:26 +0000,Dominique Belhachemi写道:
> > > Wire up the standard non-coherent path matching the ingenic DRM
> > > driver.
> > >
> > > Tested on StarFive JH7110 (VisionFive 2 v1.3B).
> >
> > Interesting, I am curious about other patches added to test this.
> >
> Hi,
>
> I tested this on Debian unstable with a slightly patched 7.0.3 kernel
> [1].
> The test branch contains your verisilicon series, Michal's JH7110
> display series [2],
> and a JH7110 ccache change [3], which was also required to
> communicate
> with the BXE-4-32 firmware [4].

BTW did you run any rendering? I think the way currently powervr open
source driver works requires "coherent memory" (although it's usually
implemented as uncached memory).

>
> This change here is only used to remove the ugly framebuffer stripes
> on the console and in the desktop environment.

But I still think it'd be better to implement proper uncached memory
support instead of flushing caches with dirty tracking.

>
> [1] https://github.com/domibel/linux/tree/jh7110_dc8200_hdmi_v7.0.3
> [2]
> https://lore.kernel.org/lkml/20251108-jh7110-clean-send-v1-0-06bf43bb76b1@samsung.com/
> [3]
> https://lore.kernel.org/lkml/20260430035259.3402954-1-domibel@debian.org/
> [4]
> https://github.com/domibel/linux/tree/powervr_on_jh7110_visionfive2_v7.0.3

The POW_RASCALDUST thing looks quite interesting, maybe I should
investigate it further.

Thanks,
Icenowy
>
> Dominique


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