drm/vmwgfx/vmwgfx_kms: Update worthy function headers and demote others

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

 In file included from drivers/gpu/drm/vmwgfx/vmwgfx_kms.c:37:
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c:483: warning: Function parameter or member 'new_state' not described in 'vmw_du_cursor_plane_atomic_check'
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c:483: warning: Excess function parameter 'state' description in 'vmw_du_cursor_plane_atomic_check'
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c:1069: warning: Function parameter or member 'vfb' not described in 'vmw_framebuffer_pin'
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c:1281: warning: Function parameter or member 'dev_priv' not described in 'vmw_kms_srf_ok'
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c:1907: warning: Function parameter or member 'crtc' not described in 'vmw_get_vblank_counter'
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c:1915: warning: Function parameter or member 'crtc' not described in 'vmw_enable_vblank'
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c:1923: warning: Function parameter or member 'crtc' not described in 'vmw_disable_vblank'
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c:2131: warning: Function parameter or member 'mode' not described in 'vmw_guess_mode_timing'

Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Cc: Roland Scheidegger <sroland@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/20210115181313.3431493-21-lee.jones@linaro.org

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

@@ -467,7 +467,7 @@ int vmw_du_primary_plane_atomic_check(struct drm_plane *plane,
  * vmw_du_cursor_plane_atomic_check - check if the new state is okay
  *
  * @plane: cursor plane
- * @state: info on the new plane state
+ * @new_state: info on the new plane state
  *
  * This is a chance to fail if the new cursor state does not fit
  * our requirements.
@@ -1057,7 +1057,7 @@ static const struct drm_framebuffer_funcs vmw_framebuffer_bo_funcs = {
 	.dirty = vmw_framebuffer_bo_dirty_ext,
 };
 
-/**
+/*
  * Pin the bofer in a location suitable for access by the
  * display system.
  */
@@ -1267,6 +1267,7 @@ static int vmw_kms_new_framebuffer_bo(struct vmw_private *dev_priv,
 /**
  * vmw_kms_srf_ok - check if a surface can be created
  *
+ * @dev_priv: Pointer to device private struct.
  * @width: requested width
  * @height: requested height
  *
@@ -1896,7 +1897,7 @@ bool vmw_kms_validate_mode_vram(struct vmw_private *dev_priv,
 }
 
 
-/**
+/*
  * Function called by DRM code called with vbl_lock held.
  */
 u32 vmw_get_vblank_counter(struct drm_crtc *crtc)
@@ -1904,7 +1905,7 @@ u32 vmw_get_vblank_counter(struct drm_crtc *crtc)
 	return 0;
 }
 
-/**
+/*
  * Function called by DRM code called with vbl_lock held.
  */
 int vmw_enable_vblank(struct drm_crtc *crtc)
@@ -1912,7 +1913,7 @@ int vmw_enable_vblank(struct drm_crtc *crtc)
 	return -EINVAL;
 }
 
-/**
+/*
  * Function called by DRM code called with vbl_lock held.
  */
 void vmw_disable_vblank(struct drm_crtc *crtc)
@@ -2120,7 +2121,7 @@ static struct drm_display_mode vmw_kms_connector_builtin[] = {
  * vmw_guess_mode_timing - Provide fake timings for a
  * 60Hz vrefresh mode.
  *
- * @mode - Pointer to a struct drm_display_mode with hdisplay and vdisplay
+ * @mode: Pointer to a struct drm_display_mode with hdisplay and vdisplay
  * members filled in.
  */
 void vmw_guess_mode_timing(struct drm_display_mode *mode)