drm/doc: Document drm_helper_resume_force_mode

Stumbled over while reviewing all occurences in the DRM doc talking
about suspend/resume.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl
index 26539ee3c63eec4a8289228bf35af24e51718849..8e1052434baba8b43223eec2e0220eb536fe52d7 100644 (file)
--- a/Documentation/DocBook/drm.tmpl
+++ b/Documentation/DocBook/drm.tmpl
@@ -1151,8 +1151,11 @@ int max_width, max_height;</synopsis>
             This operation is called with the mode config lock held.
           </para>
           <note><para>
-            FIXME: How should set_config interact with DPMS? If the CRTC is
-            suspended, should it be resumed?
+           Note that the drm core has no notion of restoring the mode setting
+           state after resume, since all resume handling is in the full
+           responsibility of the driver. The common mode setting helper library
+           though provides a helper which can be used for this:
+           <function>drm_helper_resume_force_mode</function>.
           </para></note>
         </sect4>
         <sect4>

diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index ea92b827e787e3543a745b119822085618c16988..85d476abea6cadab89270c496e496afc01e2e4b1 100644 (file)
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -943,6 +943,15 @@ int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 }
 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 
+/**
+ * drm_helper_resume_force_mode - force-restore mode setting configuration
+ * @dev: drm_device which should be restored
+ *
+ * Drivers which use the mode setting helpers can use this function to
+ * force-restore the mode setting configuration e.g. on resume or when something
+ * else might have trampled over the hw state (like some overzealous old BIOSen
+ * tended to do).
+ */
 int drm_helper_resume_force_mode(struct drm_device *dev)
 {
        struct drm_crtc *crtc;