drm/fb-helper: Add fill_info() functions

The fbdev split between fix and var information is kinda
pointless for drm drivers since everything is fixed: The fbdev
emulation doesn't support changing modes at all.

Create a new simplified helper and use it in the generic fbdev
helper code. Follow-up patches will beef it up more and roll
it out to all drivers.

v2: We need to keep sizes, since they might not match the fb dimensions
(Noralf)

v3: Fix typo in commit message and remove extraneous line in kerneldoc (Noralf)

Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190326132008.11781-1-daniel.vetter@ffwll.ch

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index d703487..e80c6a6 100644 (file)
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -2105,6 +2105,32 @@ void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helpe
 }
 EXPORT_SYMBOL(drm_fb_helper_fill_var);
 
+/**
+ * drm_fb_helper_fill_info - initializes fbdev information
+ * @info: fbdev instance to set up
+ * @fb_helper: fb helper instance to use as template
+ * @sizes: describes fbdev size and scanout surface size
+ *
+ * Sets up the variable and fixed fbdev metainformation from the given fb helper
+ * instance and the drm framebuffer allocated in &drm_fb_helper.fb.
+ *
+ * Drivers should call this (or their equivalent setup code) from their
+ * &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev
+ * backing storage framebuffer.
+ */
+void drm_fb_helper_fill_info(struct fb_info *info,
+                            struct drm_fb_helper *fb_helper,
+                            struct drm_fb_helper_surface_size *sizes)
+{
+       struct drm_framebuffer *fb = fb_helper->fb;
+
+       drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
+       drm_fb_helper_fill_var(info, fb_helper,
+                              sizes->fb_width, sizes->fb_height);
+
+}
+EXPORT_SYMBOL(drm_fb_helper_fill_info);
+
 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
                                                uint32_t maxX,
                                                uint32_t maxY)
@@ -3165,8 +3191,7 @@ int drm_fb_helper_generic_probe(struct drm_fb_helper *fb_helper,
 #endif
        strcpy(fbi->fix.id, "DRM emulated");
 
-       drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth);
-       drm_fb_helper_fill_var(fbi, fb_helper, sizes->fb_width, sizes->fb_height);
+       drm_fb_helper_fill_info(fbi, fb_helper, sizes);
 
        if (fb->funcs->dirty) {
                struct fb_ops *fbops;

diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index bb9acea..1833e9c 100644 (file)
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -292,6 +292,9 @@ void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helpe
                            uint32_t fb_width, uint32_t fb_height);
 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
                            uint32_t depth);
+void drm_fb_helper_fill_info(struct fb_info *info,
+                            struct drm_fb_helper *fb_helper,
+                            struct drm_fb_helper_surface_size *sizes);
 
 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper);