On Thu, Sep 16, 2021 at 05:09:08PM +0000, Souza, Jose wrote: > On Thu, 2021-09-16 at 16:17 +0300, Ville Syrjälä wrote: > > On Wed, Sep 15, 2021 at 06:18:35PM +0000, Souza, Jose wrote: > > > On Wed, 2021-09-15 at 17:58 +0300, Ville Syrjälä wrote: > > > > On Tue, Sep 14, 2021 at 02:25:05PM -0700, José Roberto de Souza wrote: > > > > > Not sure why but when moving the cursor fast it causes some artifacts > > > > > of the cursor to be left in the cursor path, adding some pixels above > > > > > the cursor to the damaged area fixes the issue, so leaving this as a > > > > > workaround until proper fix is found. > > > > > > > > Have you tried warping the cursor clear across the screen while > > > > a partial update is already pending? I think it will go badly. > > > > > > You mean move the cursor for example from 0x0 to 500x500 in one frame? > > > It will mark as damaged the previous area and the new one. > > > > Legacy cursor updates bypass all that stuff so you're not going to > > updating the sel fetch area for the other planes. > > > > > > > > > > > > > In fact I'm thinking the mailbox style legacy cursor updates are just > > > > fundementally incompatible with partial updates since the cursor > > > > can move outside of the already committed update region any time. > > > > Ie. I suspect while the cursor is visible we simply can't do partial > > > > updates. > > > > > > Probably I did not understand what you want to say, but each cursor update will be in one frame, updating the necessary area. > > > > The legacy cursor uses mailbox updates so there is no 1:1 relationship > > between actual scanned out frames and cursor ioctl calls. You can > > have umpteen thousand cursor updates per frame. > > Not if intel_legacy_cursor_update() is changed to go to the slow path and do one atomic commit for each move. > https://patchwork.freedesktop.org/patch/453192/?series=94522&rev=1 That's not going to fly. The whole reason for the legacy cursor thing is that X likes to do thousands of cursor updates per frame. > > I believe compositors will do a single atomic commit updating cursor and all the other planes into a single commit. No. X obviously doesn't do that. And IIRC chromeos also uses the legacy cursor ioctl for the cursor despite using atomic commits for everything else. -- Ville Syrjälä Intel
