drm/amdgpu: correct comment to clear up the confusion

Former comment looks to be one intended behavior in code,
actually it's not. So correct it.
Suggested-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Guchun Chen <guchun.chen@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c

@@ -4374,7 +4374,12 @@ static int gfx_v9_0_ecc_late_init(void *handle)
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 	int r;
 
-	/* limit gds clearing operation in cold boot sequence */
+	/*
+	 * Temp workaround to fix the issue that CP firmware fails to
+	 * update read pointer when CPDMA is writing clearing operation
+	 * to GDS in suspend/resume sequence on several cards. So just
+	 * limit this operation in cold boot sequence.
+	 */
 	if (!adev->in_suspend) {
 		r = gfx_v9_0_do_edc_gds_workarounds(adev);
 		if (r)