On Thu, 14 Dec 2017 10:11:32 -0500 Alex Deucher <alexdeuc...@gmail.com> wrote:
> On Thu, Dec 14, 2017 at 6:40 AM, Pekka Paalanen <ppaala...@gmail.com> wrote: > > From: Pekka Paalanen <pekka.paala...@collabora.co.uk> > > > > Hi all, > > > > this is v5 (to match the numbering of my public branches) of the libweston > > user > > facing API and infrastructure for supporting shared-CRTC clone mode. > > > > Previous submission with rationale: > > https://lists.freedesktop.org/archives/wayland-devel/2017-October/035604.html > > > > Design document: > > https://phabricator.freedesktop.org/w/wayland/weston/atomic-output-config/ > > > > The goal: > > https://phabricator.freedesktop.org/T7727 > > FWIW, at least with the DC modesetting code in amdgpu, we can > synchronize multiple crtcs to the same timing when the monitors all > support the same mode timing or with monitors that have different > timings using variable length blanking periods on freesync capable > monitors. Hi Alex, that's cool. How does userspace take advantage of that, how do you configure KMS/atomic to make use of that? Is it supported through legacy KMS (non-atomic) as well? Does it involve things like the driver stealing an unused CRTC for each additional clone? The feature would fit perfectly under the "shared-CRTC clone mode" from libweston API point of view, even though it's not actually a single shared CRTC. Thanks, pq > > > Alex > > > > > Changes in v5 compared to v3 are minor: > > - "libweston: properly orphan wl_output resources" is new. > > - Removal of wl_output global, when a head is detached from an enabled > > output. > > - Print "Detected a monitor change" only for enabled heads. > > > > You can find this series in the branch: > > https://gitlab.collabora.com/pq/weston/commits/clonemode-user-API-5 > > > > I went through the same testing procedure as with v3, the previous > > submission. > > > > > > However, the interesting bits are in the branch: > > https://gitlab.collabora.com/pq/weston/commits/clonemode-4 > > > > As new things compared to clonemode-user-API-2, that one contains: > > - support for configuring clone mode in weston.ini > > - main.c implementation to configure a clode using the new API > > - desktop-shell enhancements to avoid redundant panel and background > > surfaces > > in clone mode > > - hooking up custom data to weston_output via a new user-side destroy signal > > - naming outputs freely > > - DRM-backend support for shared-CRTC clone mode > > - video mode list merging in the DRM-backend > > > > The shared-CRTC clone mode has been tested to work on an i.MX6 device. > > Unfortunately it seems that PC hardware that would support it is becoming > > scarce AFAIU. > > > > Most of the patches in clonemode-4 depend on the atomic modesetting series > > and > > can therefore be submitted only after that one. > >
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