From: Daniel Vetter <daniel@ffwll.ch>
To: Pekka Paalanen <ppaalanen@gmail.com>
Cc: stylon.wang@amd.com, thong.thai@amd.com, shashank.sharma@amd.com,
dri-devel@lists.freedesktop.org, nicholas.kazlauskas@amd.com,
Aurabindo Pillai <aurabindo.pillai@amd.com>,
amd-gfx@lists.freedesktop.org, wayne.lin@amd.com,
alexander.deucher@amd.com, christian.koenig@amd.com
Subject: Re: [PATCH 0/3] Experimental freesync video mode optimization
Date: Fri, 22 Jan 2021 10:42:53 +0100 [thread overview]
Message-ID: <YAqeHZlDBrgALLo9@phenom.ffwll.local> (raw)
In-Reply-To: <20210122103248.779e70bf@eldfell>
On Fri, Jan 22, 2021 at 10:32:48AM +0200, Pekka Paalanen wrote:
> On Tue, 19 Jan 2021 10:50:26 -0500
> Aurabindo Pillai <aurabindo.pillai@amd.com> wrote:
>
> > Changes in V5
> > =============
> >
> > * More info in commit messages on the rationale of changes being added
> > to the kernel.
> > * Minor fixes
>
> Hi,
>
> thank you for adding the explanations in the commit messages I asked
> for. It is now up to DRM maintainers to determine if this is
> conceptually fine.
>
> I do see that apparently setting the opt-in option does not yet taint
> the kernel although Daniel Vetter suggested it might be a good idea. I
> guess tainting the kernel would make it easier to remove this feature
> in the future because it would be easier to dismiss people that claim a
> kernel regression due to the removal.
Reading the descriptions I'm honestly not sure why this isn't enabled by
default?
Maybe the explanations should also capture why this is maybe not a good
idea ...
-Daniel
>
>
> Thanks,
> pq
>
>
> > --
> >
> > This patchset enables freesync video mode usecase where the userspace
> > can request a freesync compatible video mode such that switching to this
> > mode does not trigger blanking.
> >
> > This feature is guarded by a module parameter which is disabled by
> > default. Enabling this paramters adds additional modes to the driver
> > modelist, and also enables the optimization to skip modeset when using
> > one of these modes.
> >
> > --
> >
> > Aurabindo Pillai (3):
> > drm/amd/display: Add module parameter for freesync video mode
> > drm/amd/display: Add freesync video modes based on preferred modes
> > drm/amd/display: Skip modeset for front porch change
> >
> > drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 +
> > drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 12 +
> > .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 401 ++++++++++++++++--
> > .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 3 +
> > 4 files changed, 382 insertions(+), 35 deletions(-)
> >
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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next prev parent reply other threads:[~2021-01-22 9:43 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-19 15:50 [PATCH 0/3] Experimental freesync video mode optimization Aurabindo Pillai
2021-01-19 15:50 ` [PATCH 1/3] drm/amd/display: Add module parameter for freesync video mode Aurabindo Pillai
2021-01-19 15:50 ` [PATCH 2/3] drm/amd/display: Add freesync video modes based on preferred modes Aurabindo Pillai
2021-01-19 15:50 ` [PATCH 3/3] drm/amd/display: Skip modeset for front porch change Aurabindo Pillai
2021-01-21 19:05 ` Kazlauskas, Nicholas
2021-01-25 4:00 ` Aurabindo Pillai
2021-02-08 15:06 ` Kazlauskas, Nicholas
2021-02-12 20:01 ` Aurabindo Pillai
2021-01-22 8:32 ` [PATCH 0/3] Experimental freesync video mode optimization Pekka Paalanen
2021-01-22 9:42 ` Daniel Vetter [this message]
2021-01-22 9:44 ` Daniel Vetter
2021-01-22 15:16 ` Alex Deucher
2021-02-02 14:27 ` Daniel Vetter
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