drm/vmwgfx/vmwgfx_stdu: Add some missing param/member descriptions

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c:77: warning: Function parameter or member 'pitch' not described in 'vmw_stdu_dirty'
 drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c:125: warning: Function parameter or member 'content_fb_type' not described in 'vmw_screen_target_display_unit'
 drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c:125: warning: Function parameter or member 'display_width' not described in 'vmw_screen_target_display_unit'
 drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c:125: warning: Function parameter or member 'display_height' not described in 'vmw_screen_target_display_unit'
 drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c:125: warning: Function parameter or member 'cpp' not described in 'vmw_screen_target_display_unit'
 drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c:682: warning: Function parameter or member 'user_fence_rep' not described in 'vmw_kms_stdu_dma'

Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Cc: Roland Scheidegger <sroland@vmware.com>
Cc: Zack Rusin <zackr@vmware.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Zack Rusin <zackr@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210115181313.3431493-41-lee.jones@linaro.org

drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c

@@ -61,6 +61,7 @@ enum stdu_content_type {
  * @bottom: Bottom side of bounding box.
  * @fb_left: Left side of the framebuffer/content bounding box
  * @fb_top: Top of the framebuffer/content bounding box
+ * @pitch: framebuffer pitch (stride)
  * @buf: buffer object when DMA-ing between buffer and screen targets.
  * @sid: Surface ID when copying between surface and screen targets.
  */
@@ -109,8 +110,11 @@ struct vmw_stdu_update_gb_image {
  *               content_vfbs dimensions, then this is a pointer into the
  *               corresponding field in content_vfbs.  If not, then this
  *               is a separate buffer to which content_vfbs will blit to.
- * @content_type:  content_fb type
- * @defined:  true if the current display unit has been initialized
+ * @content_fb_type: content_fb type
+ * @display_width:  display width
+ * @display_height: display height
+ * @defined:     true if the current display unit has been initialized
+ * @cpp:         Bytes per pixel
  */
 struct vmw_screen_target_display_unit {
 	struct vmw_display_unit base;
@@ -652,6 +656,7 @@ static void vmw_stdu_bo_cpu_commit(struct vmw_kms_dirty *dirty)
  * @file_priv: Pointer to a struct drm-file identifying the caller. May be
  * set to NULL, but then @user_fence_rep must also be set to NULL.
  * @vfb: Pointer to the buffer-object backed framebuffer.
+ * @user_fence_rep: User-space provided structure for fence information.
  * @clips: Array of clip rects. Either @clips or @vclips must be NULL.
  * @vclips: Alternate array of clip rects. Either @clips or @vclips must
  * be NULL.