[PATCH 1/3] drm: Use original src rect while initializing damage iterator

[Hogander, Jouni]

On Fri, 2022-08-19 at 09:09 -0300, Maíra Canal wrote:
> Hi Jouni,
> 
> On 7/15/22 10:49, Jouni Högander wrote:
> > drm_plane_state->src might be modified by the driver. This is done
> > e.g. in i915 driver when there is bigger framebuffer than the plane
> > and there is some offset within framebuffer. I915 driver calculates
> > separate offset and adjusts src rect coords to be relative to this
> > offset. Damage clips are still relative to original src coords
> > provided by user-space.
> > 
> > This patch ensures original coordinates provided by user-space are
> > used when initiliazing damage iterator.
> > 
> 
> drm_damage_helper has some KUnit tests on drivers/gpu/drm/tests, and
> by
> applying this patch the drm_damage_helper tests started to fail.
> Could
> you also refactor the drm_damage_helper tests?
> 
> To run the tests, you can run:
> $ ./tools/testing/kunit/kunit.py run \
> --kunitconfig=drivers/gpu/drm/tests \
> --kconfig_add CONFIG_UML_PCI_OVER_VIRTIO=y \
> --kconfig_add CONFIG_VIRTIO_UML=y
> 
> There is also some documentation on the DRM KUnit Tests on [1].
> 
> [1] https://docs.kernel.org/gpu/drm-internals.html#unit-testing

Ok, thank you for these. I will take a look.

> 
> Best Regards,
> - Maíra Canal
> 
> > Signed-off-by: Jouni Högander <jouni.hogander at intel.com>> ---
> >  drivers/gpu/drm/drm_damage_helper.c | 11 +++++++----
> >  1 file changed, 7 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/drm_damage_helper.c
> > b/drivers/gpu/drm/drm_damage_helper.c
> > index 937b699ac2a8..d8b2955e88fd 100644
> > --- a/drivers/gpu/drm/drm_damage_helper.c
> > +++ b/drivers/gpu/drm/drm_damage_helper.c
> > @@ -224,6 +224,7 @@ drm_atomic_helper_damage_iter_init(struct
> > drm_atomic_helper_damage_iter *iter,
> >  				   const struct drm_plane_state
> > *old_state,
> >  				   const struct drm_plane_state *state)
> >  {
> > +	struct drm_rect src;
> >  	memset(iter, 0, sizeof(*iter));
> >  
> >  	if (!state || !state->crtc || !state->fb || !state->visible)
> > @@ -233,10 +234,12 @@ drm_atomic_helper_damage_iter_init(struct
> > drm_atomic_helper_damage_iter *iter,
> >  	iter->num_clips = drm_plane_get_damage_clips_count(state);
> >  
> >  	/* Round down for x1/y1 and round up for x2/y2 to catch all
> > pixels */
> > -	iter->plane_src.x1 = state->src.x1 >> 16;
> > -	iter->plane_src.y1 = state->src.y1 >> 16;
> > -	iter->plane_src.x2 = (state->src.x2 >> 16) + !!(state->src.x2 &
> > 0xFFFF);
> > -	iter->plane_src.y2 = (state->src.y2 >> 16) + !!(state->src.y2 &
> > 0xFFFF);
> > +	src = drm_plane_state_src(state);
> > +
> > +	iter->plane_src.x1 = src.x1 >> 16;
> > +	iter->plane_src.y1 = src.y1 >> 16;
> > +	iter->plane_src.x2 = (src.x2 >> 16) + !!(src.x2 & 0xFFFF);
> > +	iter->plane_src.y2 = (src.y2 >> 16) + !!(src.y2 & 0xFFFF);
> >  
> >  	if (!iter->clips || !drm_rect_equals(&state->src, &old_state-
> > >src)) {
> >  		iter->clips = NULL;