Re: [PATCH v3 3/3] drm/amdgpu: Implement check_async_props for planes

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Hi Sima,

Em 30/01/2024 07:56, Daniel Vetter escreveu:
On Sun, Jan 28, 2024 at 06:25:15PM -0300, André Almeida wrote:
AMD GPUs can do async flips with changes on more properties than just
the FB ID, so implement a custom check_async_props for AMD planes.

Allow amdgpu to do async flips with overlay planes as well.

Signed-off-by: André Almeida <andrealmeid@xxxxxxxxxx>
---
v3: allow overlay planes

This comment very much written with a lack of clearly better ideas, but:

Do we really need this much flexibility, especially for the first driver
adding the first few additional properties?

A simple bool on struct drm_plane to indicate whether async flips are ok
or not should also do this job here? Maybe a bit of work to roll that out
to the primary planes for current drivers, but not much. And wouldn't need
drivers to implement some very uapi-marshalling atomic code ...

Right, perhaps I can first write in the way you suggest, and later expand to the form I have proposed here if/when new properties arise.


Also we could probably remove the current drm_mode_config.async_flip flag
and entirely replace it with the per-plane one.
-Sima

  .../amd/display/amdgpu_dm/amdgpu_dm_plane.c   | 29 +++++++++++++++++++
  1 file changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
index 116121e647ca..ed75b69636b4 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
@@ -25,6 +25,7 @@
   */
#include <drm/drm_atomic_helper.h>
+#include <drm/drm_atomic_uapi.h>
  #include <drm/drm_blend.h>
  #include <drm/drm_gem_atomic_helper.h>
  #include <drm/drm_plane_helper.h>
@@ -1430,6 +1431,33 @@ static void amdgpu_dm_plane_drm_plane_destroy_state(struct drm_plane *plane,
  	drm_atomic_helper_plane_destroy_state(plane, state);
  }
+static int amdgpu_dm_plane_check_async_props(struct drm_property *prop,
+					  struct drm_plane *plane,
+					  struct drm_plane_state *plane_state,
+					  struct drm_mode_object *obj,
+					  u64 prop_value, u64 old_val)
+{
+	struct drm_mode_config *config = &plane->dev->mode_config;
+	int ret;
+
+	if (prop != config->prop_fb_id &&
+	    prop != config->prop_in_fence_fd) {
+		ret = drm_atomic_plane_get_property(plane, plane_state,
+						    prop, &old_val);
+		return drm_atomic_check_prop_changes(ret, old_val, prop_value, prop);
+	}
+
+	if (plane_state->plane->type != DRM_PLANE_TYPE_PRIMARY &&
+	    plane_state->plane->type != DRM_PLANE_TYPE_OVERLAY) {
+		drm_dbg_atomic(prop->dev,
+			       "[OBJECT:%d] Only primary or overlay planes can be changed during async flip\n",
+			       obj->id);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
  static const struct drm_plane_funcs dm_plane_funcs = {
  	.update_plane	= drm_atomic_helper_update_plane,
  	.disable_plane	= drm_atomic_helper_disable_plane,
@@ -1438,6 +1466,7 @@ static const struct drm_plane_funcs dm_plane_funcs = {
  	.atomic_duplicate_state = amdgpu_dm_plane_drm_plane_duplicate_state,
  	.atomic_destroy_state = amdgpu_dm_plane_drm_plane_destroy_state,
  	.format_mod_supported = amdgpu_dm_plane_format_mod_supported,
+	.check_async_props = amdgpu_dm_plane_check_async_props,
  };
int amdgpu_dm_plane_init(struct amdgpu_display_manager *dm,
--
2.43.0





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