[PATCH 4/8] drm: add initial_config function to fb helper

[Chris Wilson]

From: Jesse Barnes <jbarnes at virtuousgeek.org>

Rather than building a config which may or may not work, let the driver
build an initial fb config.  This allows the driver to use the BIOS boot
configuration for example, displaying kernel messages and the initial fb
console on the same outputs the BIOS lit up at boot time.  If that
fails, the driver can still fall back the same way as the core.

Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: dri-devel at lists.freedesktop.org
---
 drivers/gpu/drm/drm_fb_helper.c |   23 +++++++++++++++--------
 include/drm/drm_fb_helper.h     |    4 ++++
 2 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 954d175..924901d 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1247,7 +1247,7 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
 	struct drm_mode_set *modeset;
 	bool *enabled;
 	int width, height;
-	int i, ret;
+	int i;
 
 	DRM_DEBUG_KMS("\n");
 
@@ -1268,16 +1268,23 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
 
 	drm_enable_connectors(fb_helper, enabled);
 
-	ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
-	if (!ret) {
-		ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
-		if (!ret)
+	if (!(fb_helper->funcs->initial_config &&
+	      fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
+					       enabled, width, height))) {
+		memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
+		memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
+
+		if (!drm_target_cloned(fb_helper,
+				       modes, enabled, width, height) &&
+		    !drm_target_preferred(fb_helper,
+					  modes, enabled, width, height))
 			DRM_ERROR("Unable to find initial modes\n");
-	}
 
-	DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
+		DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
+			      width, height);
 
-	drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
+		drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
+	}
 
 	/* need to set the modesets up here for use later */
 	/* fill out the connector<->crtc mappings into the modesets */
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index 5120b01..40b0c5c 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -56,6 +56,10 @@ struct drm_fb_helper_funcs {
 
 	int (*fb_probe)(struct drm_fb_helper *helper,
 			struct drm_fb_helper_surface_size *sizes);
+	bool (*initial_config)(struct drm_fb_helper *fb_helper,
+			       struct drm_fb_helper_crtc **crtcs,
+			       struct drm_display_mode **modes,
+			       bool *enabled, int width, int height);
 };
 
 struct drm_fb_helper_connector {
-- 
1.7.10.4