On 07/30, Nicholas Kazlauskas wrote: > [Why] > MEDIUM or FULL updates can require global validation or affect > bandwidth. By treating these all simply as surface updates we aren't > actually passing this through DC global validation. > > [How] > There's currently no way to pass surface updates through DC global > validation, nor do I think it's a good idea to change the interface > to accept these. > > DC global validation itself is currently stateless, and we can move > our update type checking to be stateless as well by duplicating DC > surface checks in DM based on DRM properties. > > We wanted to rely on DC automatically determining this since DC knows > best, but DM is ultimately what fills in everything into DC plane > state so it does need to know as well. > > There are basically only three paths that we exercise in DM today: > > 1) Cursor (async update) > 2) Pageflip (fast update) > 3) Full pipe programming (medium/full updates) > > Which means that anything that's more than a pageflip really needs to > go down path #3. > > So this change duplicates all the surface update checks based on DRM > state instead inside of should_reset_plane(). > > Next step is dropping dm_determine_update_type_for_commit and we no > longer require the old DC state at all for global validation. > > Optimization can come later so we don't reset DC planes at all for > MEDIUM udpates and avoid validation, but we might require some extra > checks in DM to achieve this.
How about adding this optimization description in our TODO list under-display folder? Reviewed-by: Rodrigo Siqueira <rodrigo.sique...@amd.com> > Cc: Bhawanpreet Lakha <bhawanpreet.la...@amd.com> > Cc: Hersen Wu <hersenxs...@amd.com> > Signed-off-by: Nicholas Kazlauskas <nicholas.kazlaus...@amd.com> > --- > .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 25 +++++++++++++++++++ > 1 file changed, 25 insertions(+) > > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c > b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c > index 0d5f45742bb5..2cbb29199e61 100644 > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c > @@ -8336,6 +8336,31 @@ static bool should_reset_plane(struct drm_atomic_state > *state, > if (old_other_state->crtc != new_other_state->crtc) > return true; > > + /* Src/dst size and scaling updates. */ > + if (old_other_state->src_w != new_other_state->src_w || > + old_other_state->src_h != new_other_state->src_h || > + old_other_state->crtc_w != new_other_state->crtc_w || > + old_other_state->crtc_h != new_other_state->crtc_h) > + return true; > + > + /* Rotation / mirroring updates. */ > + if (old_other_state->rotation != new_other_state->rotation) > + return true; > + > + /* Blending updates. */ > + if (old_other_state->pixel_blend_mode != > + new_other_state->pixel_blend_mode) > + return true; > + > + /* Alpha updates. */ > + if (old_other_state->alpha != new_other_state->alpha) > + return true; > + > + /* Colorspace changes. */ > + if (old_other_state->color_range != > new_other_state->color_range || > + old_other_state->color_encoding != > new_other_state->color_encoding) > + return true; > + > /* Framebuffer checks fall at the end. */ > if (!old_other_state->fb || !new_other_state->fb) > continue; > -- > 2.25.1 > > _______________________________________________ > amd-gfx mailing list > amd-gfx@lists.freedesktop.org > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Famd-gfx&data=02%7C01%7CRodrigo.Siqueira%40amd.com%7Ccc095e7ce6164f529e2708d834c86d1b%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637317382766607890&sdata=omLC%2BizXVEjjGe6IylBpniZzyUGlzTATrgRoWEo6dHc%3D&reserved=0 -- Rodrigo Siqueira https://siqueira.tech
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