drm: Export the command-line mode parser

In the absence of configuration data for providing the fixed mode for
a panel, I would like to be able to pass such modes along a separate
module paramenter. To do so, I then need to parse a modeline from a
string, which drm is already capable of. Export that capability to the
drivers.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 4ab866e73f46..738b3a5faa12 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -994,6 +994,22 @@ struct drm_minor {
         struct drm_mode_group mode_group;
 };
 
+/* mode specified on the command line */
+struct drm_cmdline_mode {
+        bool specified;
+        bool refresh_specified;
+        bool bpp_specified;
+        int xres, yres;
+        int bpp;
+        int refresh;
+        bool rb;
+        bool interlace;
+        bool cvt;
+        bool margins;
+        enum drm_connector_force force;
+};
+
+
 struct drm_pending_vblank_event {
         struct drm_pending_event base;
         int pipe;
@@ -1389,6 +1405,15 @@ extern int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
                                                  struct drm_crtc *refcrtc);
 extern void drm_calc_timestamping_constants(struct drm_crtc *crtc);
 
+extern bool
+drm_mode_parse_command_line_for_connector(const char *mode_option,
+                                          struct drm_connector *connector,
+                                          struct drm_cmdline_mode *mode);
+
+extern struct drm_display_mode *
+drm_mode_create_from_cmdline_mode(struct drm_device *dev,
+                                  struct drm_cmdline_mode *cmd);
+
 /* Modesetting support */
 extern void drm_vblank_pre_modeset(struct drm_device *dev, int crtc);
 extern void drm_vblank_post_modeset(struct drm_device *dev, int crtc);