[PATCH V3 46/47] drm/amd/display: Fix failures of disabling primary plans

[Wayne Lin]

From: Alex Hung <alex.hung at amd.com>

[Why & How]
This fixes kernel errors when IGT disables primary planes during the
tests kms_universal_plane::functional_test_pipe/pageflip_test_pipe.

Acked-by: Wayne Lin <wayne.lin at amd.com>
Signed-off-by: Alex Hung <alex.hung at amd.com>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c   | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
index c89594f3a5cb..099a226407a3 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
@@ -376,18 +376,6 @@ static int dm_crtc_helper_atomic_check(struct drm_crtc *crtc,
 		return ret;
 	}
 
-	/*
-	 * We require the primary plane to be enabled whenever the CRTC is, otherwise
-	 * drm_mode_cursor_universal may end up trying to enable the cursor plane while all other
-	 * planes are disabled, which is not supported by the hardware. And there is legacy
-	 * userspace which stops using the HW cursor altogether in response to the resulting EINVAL.
-	 */
-	if (crtc_state->enable &&
-		!(crtc_state->plane_mask & drm_plane_mask(crtc->primary))) {
-		DRM_DEBUG_ATOMIC("Can't enable a CRTC without enabling the primary plane\n");
-		return -EINVAL;
-	}
-
 	/* In some use cases, like reset, no stream is attached */
 	if (!dm_crtc_state->stream)
 		return 0;
-- 
2.37.3