Re: [PATCH 2/6] drm: Add drm_atomic_helper_buffer_damage_{iter_init,merged}() helpers

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Hi

Am 14.11.23 um 16:58 schrieb Javier Martinez Canillas:
Thomas Zimmermann <tzimmermann@xxxxxxx> writes:

Hello Thomas,

Thanks a lot for your feedback.

Hi

Am 09.11.23 um 18:24 schrieb Javier Martinez Canillas:
To be used by drivers that do per-buffer (e.g: virtio-gpu) uploads (rather
than per-plane uploads), since these type of drivers need to handle buffer
damages instead of frame damages.

The drm_atomic_helper_buffer_damage_iter_init() has the same logic than
drm_atomic_helper_damage_iter_init() but it also takes into account if the
framebuffer attached to plane's state has changed since the last update.

And the drm_atomic_helper_buffer_damage_merged() is just a version of the
drm_atomic_helper_damage_merged() helper, but it uses the iter_init helper
that is mentioned above.

Fixes: 01f05940a9a7 ("drm/virtio: Enable fb damage clips property for the primary plane")
Cc: <stable@xxxxxxxxxxxxxxx> # v6.4+
Reported-by: nerdopolis <bluescreen_avenger@xxxxxxxxxxx>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218115
Suggested-by: Sima Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Javier Martinez Canillas <javierm@xxxxxxxxxx>
---

   drivers/gpu/drm/drm_damage_helper.c | 79 ++++++++++++++++++++++++++---
   include/drm/drm_damage_helper.h     |  7 +++
   2 files changed, 80 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_damage_helper.c b/drivers/gpu/drm/drm_damage_helper.c
index aa2325567918..b72062c9d31c 100644
--- a/drivers/gpu/drm/drm_damage_helper.c
+++ b/drivers/gpu/drm/drm_damage_helper.c
@@ -204,7 +204,8 @@ EXPORT_SYMBOL(drm_atomic_helper_dirtyfb);
   static void
   __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)
+				     const struct drm_plane_state *state,
+				     bool buffer_damage)

I think it would be preferable to drop patches one and two and instead
add this parameter directly to drm_atomic_helper_damage_iter_init() and
drm_atomic_helper_damage_merged().  That's a bit of churn, but more
readable code.


Makes sense. I'll do that in v2.

Instead of modifying these function interfaces, it might be even better to introduce a state flag in struct drm_plane_state that you can modify in the plane's atomic_check helper. Something simple like this:

  if (old_fb != new_fb)
    plane_state->ignore_damage_clips = true;

in the affected drivers/planes. In drm_atomic_helper_damage_iter_init() you can use it to generate a full update. This avoids the churn and is in line with the overall check/commit design of the DRM framework.

Best regards
Thomas


Best regards
Thomas



--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

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