drm/nouveau: Use drm_fb_helper_fill_info

This changes the fb name from "nouveaufb" to "nouveaudrmfb".

Aside: I wonder whether the in_interrupt() check is good enough for
the nouveau acceleration. Cargo-cult says drm_can_sleep() is needed,
which isn't actually working if you pick a .config without PREEMPT.
For the generic fbdev defio support we've gone with offloading
everything to a worker. For the non-accel callbacks (set_par, blank
and friends) checking for oops_in_progress is good enough to catch all
the evil calling contexts.

v2: Rebase
Acked-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: nouveau@lists.freedesktop.org
Link: https://patchwork.freedesktop.org/patch/msgid/20190326132008.11781-14-daniel.vetter@ffwll.ch

drivers/gpu/drm/nouveau/nouveau_fbcon.c

@@ -366,12 +366,9 @@ nouveau_fbcon_create(struct drm_fb_helper *helper,
 		goto out_unlock;
 	}
 
-	info->par = fbcon;
-
 	/* setup helper */
 	fbcon->helper.fb = &fb->base;
 
-	strcpy(info->fix.id, "nouveaufb");
 	if (!chan)
 		info->flags = FBINFO_HWACCEL_DISABLED;
 	else
@@ -386,9 +383,7 @@ nouveau_fbcon_create(struct drm_fb_helper *helper,
 	info->screen_base = nvbo_kmap_obj_iovirtual(fb->nvbo);
 	info->screen_size = fb->nvbo->bo.mem.num_pages << PAGE_SHIFT;
 
-	drm_fb_helper_fill_fix(info, fb->base.pitches[0],
-			       fb->base.format->depth);
-	drm_fb_helper_fill_var(info, &fbcon->helper, sizes->fb_width, sizes->fb_height);
+	drm_fb_helper_fill_info(info, &fbcon->helper, sizes);
 
 	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 

drivers/gpu/drm/nouveau/nouveau_fbcon.h

@@ -32,7 +32,7 @@
 #include "nouveau_display.h"
 
 struct nouveau_fbdev {
-	struct drm_fb_helper helper;
+	struct drm_fb_helper helper; /* must be first */
 	unsigned int saved_flags;
 	struct nvif_object surf2d;
 	struct nvif_object clip;