Bug#1138060: riscv64: please enable contiguous memory allocator (CMA) support, needed for HDMI displays

From	Aurelien Jarno <aurel32@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1138060: riscv64: please enable contiguous memory allocator (CMA) support, needed for HDMI displays
Date	2026-05-28 23:50 +0200
Message-ID	<MZQM2-8Ccb-7@gated-at.bofh.it> (permalink)
References	<MZqox-8kg0-1@gated-at.bofh.it> <MZsA1-8lFB-3@gated-at.bofh.it> <MZAQV-8rnS-5@gated-at.bofh.it> <MZqox-8kg0-1@gated-at.bofh.it> <MZAQV-8rnS-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Version: 7.1~rc3-1~exp1

Hi,

On 2026-05-28 00:47, Dominique Belhachemi wrote:
> On Wed, May 27, 2026 at 3:54 PM Aurelien Jarno <aurel32@debian.org> wrote:
> >
> > Hi Dominique,
> >
> > On 2026-05-27 13:34, Dominique Belhachemi wrote:
> > > Source: linux
> > > Severity: wishlist
> > > X-Debbugs-Cc: debian-riscv@lists.debian.org
> > > User: debian-riscv@lists.debian.org
> > > Usertags: riscv64
> > >
> > > Dear maintainer,
> > >
> > > Please enable CMA on riscv64.
> > >
> > >   CONFIG_CMA=y
> > >   CONFIG_DMA_CMA=y
> >
> > Both options got enabled starting with linux 7.1~rc3-1~exp1, currently
> > available in experimental. Could you please confirm that it works for
> > your use case?
> >
> Hi Aurelien,
> Thank you, yes it works. I just tested it with 7.1~rc4-1~exp1 on a
> VisionFive 2 SBC with additional HDMI patches.
> Debian's kernel config uses
>     CONFIG_CMA_SIZE_MBYTES=64
> which is good enough for two 1920x1080 framebuffers.
> For 4K I could simply specify cma=128M on the cmdline.

Thanks for the confirmation. I am therefore closing this bug with that 
version.

Regards
Aurelien

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien@aurel32.net                     http://aurel32.net

Thread

Bug#1138060: riscv64: please enable contiguous memory allocator (CMA) support, needed for HDMI displays Dominique Belhachemi <domibel@debian.org> - 2026-05-27 19:40 +0200
  Bug#1138060: riscv64: please enable contiguous memory allocator (CMA) support, needed for HDMI displays Aurelien Jarno <aurel32@debian.org> - 2026-05-27 22:00 +0200
    Bug#1138060: riscv64: please enable contiguous memory allocator (CMA) support, needed for HDMI displays Dominique Belhachemi <domibel@debian.org> - 2026-05-28 06:50 +0200
      Bug#1138060: riscv64: please enable contiguous memory allocator (CMA) support, needed for HDMI displays Aurelien Jarno <aurel32@debian.org> - 2026-05-28 23:50 +0200
  Bug#1138060: marked as done (riscv64: please enable contiguous  memory allocator (CMA) support, needed for HDMI displays) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-29 06:40 +0200

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