On Fri, Mar 31, 2017 at 12:41:30PM +0100, Liviu Dudau wrote: > On Fri, Mar 31, 2017 at 11:27:51AM +0100, Russell King - ARM Linux wrote: > > On Fri, Mar 31, 2017 at 11:23:45AM +0100, Liviu Dudau wrote: > > > On Fri, Mar 31, 2017 at 11:20:35AM +0100, Russell King - ARM Linux wrote: > > > > On Fri, Mar 31, 2017 at 11:18:50AM +0100, Liviu Dudau wrote: > > > > > Hi Russell, > > > > > > > > > > You were Cc-ed in a patch from March 8th that did all this: > > > > > > > > > > https://lists.freedesktop.org/archives/dri-devel/2017-March/135172.html > > > > > > > > I'm aware of that (you may notice that this was threaded to that patch.) > > > > > > > > > I have not received any response from you, so I have already pushed the > > > > > patch in my public repo: > > > > > > > > > > git://linux-arm.org/linux-ld.git for-upstream/hdlcd > > > > > > > > > > It has been included into linux-next for at least a couple of weeks now. > > > > > > > > I've not had a chance to test any of this, but I believe that your > > > > patch does not fully address the issue, due to bits missing from > > > > the validation path. > > > > > > Care to point out which bits were missing from my patch that are in yours? > > > > The visible check? > > A plane's ->atomic_check() hook can be called with TEST_ONLY to figure out from > userspace if the given configuration is a valid one that can be accepted by > the hardware. There should be no error if the plane will not be visible, as we > are not programming anything yet. > > I would also argue that the test that you remove and replace with state->visible > is important. We can't do *any* scaling, while with your patch we could accept > src_w != crtc_w as long as it is visible. Hardware is not capable of handling that. That's what the "DRM_PLANE_HELPER_NO_SCALING" arguments to drm_plane_helper_check_state() are doing: drm_plane_helper_check_state() drm_rect_calc_hscale() if (hscale < min_hscale || hscale > max_hscale) return -ERANGE; drm_rect_calc_vscale() if (vscale < min_vscale || vscale > max_vscale) return -ERANGE; where DRM_PLANE_HELPER_NO_SCALING is 1.0 in 16:16 format. So, this ensures that the scaling factor is 1.0, returning -ERANGE if it isn't. If this lets through a scaled source, then there's a bug that needs fixing in the helper. -- RMK's Patch system: http://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
