[PATCH 1/2] drm/amd/display: Validate dc_plane_info and dc_plane_size in atomic check

[Nicholas Kazlauskas]

[Why]
Pitch, DCC, rotation and mirroring can result in updates that are not
UPDATE_TYPE_FAST but UPDATE_TYPE_MED instead. DC needs dc_plane_info
and dc_plane_size to make this determination and we aren't currently
passing this into DC during atomic check.

Underflow (visible or non-visible) can occur if we don't validate this
correctly. This also will generally trigger p-state warnings, typically
via the cursor handler when locking.

[How]
Get the framebuffer tiling flags and generate the required structures
for DC in dm_determine_update_type_for_commit.

Cc: David Francis <david.francis at amd.com>
Cc: Bhawanpreet Lakha <bhawanpreet.lakha at amd.com>
Cc: Leo Li <sunpeng.li at amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 24 +++++++++++++++++++
 1 file changed, 24 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 040169180a63..ffb3c7247ac6 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -6987,6 +6987,12 @@ dm_determine_update_type_for_commit(struct amdgpu_display_manager *dm,
 			continue;
 
 		for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, j) {
+			const struct amdgpu_framebuffer *amdgpu_fb =
+				to_amdgpu_framebuffer(new_plane_state->fb);
+			struct dc_plane_info plane_info;
+			struct dc_flip_addrs flip_addr;
+			uint64_t tiling_flags;
+
 			new_plane_crtc = new_plane_state->crtc;
 			old_plane_crtc = old_plane_state->crtc;
 			new_dm_plane_state = to_dm_plane_state(new_plane_state);
@@ -7030,6 +7036,24 @@ dm_determine_update_type_for_commit(struct amdgpu_display_manager *dm,
 
 			updates[num_plane].scaling_info = &scaling_info;
 
+			if (amdgpu_fb) {
+				ret = get_fb_info(amdgpu_fb, &tiling_flags);
+				if (ret)
+					goto cleanup;
+
+				memset(&flip_addr, 0, sizeof(flip_addr));
+
+				ret = fill_dc_plane_info_and_addr(
+					dm->adev, new_plane_state, tiling_flags,
+					&plane_info,
+					&flip_addr.address);
+				if (ret)
+					goto cleanup;
+
+				updates[num_plane].plane_info = &plane_info;
+				updates[num_plane].flip_addr = &flip_addr;
+			}
+
 			num_plane++;
 		}
 
-- 
2.17.1