[RFC v2 3/6] drm/tegra: Remove local fbdev emulation Kconfig option

[Archit Taneja <architt@codeaurora.org>]

DRM_TEGRA_FBDEV config is currently used to enable/disable fbdev emulation
for the tegra kms driver.

Replace this with the top level DRM_FBDEV_EMULATION config option. Using
this config lets us also prevent wrapping around drm_fb_helper_* calls with

The #ifdef in tegra_drm struct that adds/removes the terga_fbdev member
has been removed completely. This helps in calling stub drm fb helper
functions at not much cost.

We could clean up fb.c a bit further to reduce the number of #ifdefs, but
that's left for later.

Signed-off-by: Archit Taneja <architt@codeaurora.org>
---
 drivers/gpu/drm/tegra/Kconfig | 12 ------------
 drivers/gpu/drm/tegra/drm.c   | 15 ++++++++++-----
 drivers/gpu/drm/tegra/drm.h   |  8 --------
 drivers/gpu/drm/tegra/fb.c    | 25 ++++++-------------------
 4 files changed, 16 insertions(+), 44 deletions(-)

diff --git a/drivers/gpu/drm/tegra/Kconfig b/drivers/gpu/drm/tegra/Kconfig
index 74d9d62..63ebb15 100644
--- a/drivers/gpu/drm/tegra/Kconfig
+++ b/drivers/gpu/drm/tegra/Kconfig
@@ -16,18 +16,6 @@ config DRM_TEGRA
 
 if DRM_TEGRA
 
-config DRM_TEGRA_FBDEV
-	bool "Enable legacy fbdev support"
-	select DRM_KMS_FB_HELPER
-	select FB_SYS_FILLRECT
-	select FB_SYS_COPYAREA
-	select FB_SYS_IMAGEBLIT
-	default y
-	help
-	  Choose this option if you have a need for the legacy fbdev support.
-	  Note that this support also provides the Linux console on top of
-	  the Tegra modesetting driver.
-
 config DRM_TEGRA_DEBUG
 	bool "NVIDIA Tegra DRM debug support"
 	help
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 427f50c..e884e54 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -104,11 +104,17 @@ static int tegra_atomic_commit(struct drm_device *drm,
 	return 0;
 }
 
+static inline void tegra_fb_output_poll_changed(struct drm_device *drm)
+{
+	struct tegra_drm *tegra = drm->dev_private;
+
+	if (tegra->fbdev)
+		drm_fb_helper_hotplug_event(&tegra->fbdev->base);
+}
+
 static const struct drm_mode_config_funcs tegra_drm_mode_funcs = {
 	.fb_create = tegra_fb_create,
-#ifdef CONFIG_DRM_TEGRA_FBDEV
 	.output_poll_changed = tegra_fb_output_poll_changed,
-#endif
 	.atomic_check = drm_atomic_helper_check,
 	.atomic_commit = tegra_atomic_commit,
 };
@@ -259,11 +265,10 @@ static void tegra_drm_context_free(struct tegra_drm_context *context)
 
 static void tegra_drm_lastclose(struct drm_device *drm)
 {
-#ifdef CONFIG_DRM_TEGRA_FBDEV
 	struct tegra_drm *tegra = drm->dev_private;
 
-	tegra_fbdev_restore_mode(tegra->fbdev);
-#endif
+	if (tegra->fbdev)
+		drm_fb_helper_restore_fbdev_mode_unlocked(&tegra->fbdev->base);
 }
 
 static struct host1x_bo *
diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index 659b2fc..25ee5ea 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -29,12 +29,10 @@ struct tegra_fb {
 	unsigned int num_planes;
 };
 
-#ifdef CONFIG_DRM_TEGRA_FBDEV
 struct tegra_fbdev {
 	struct drm_fb_helper base;
 	struct tegra_fb *fb;
 };
-#endif
 
 struct tegra_drm {
 	struct drm_device *drm;
@@ -45,9 +43,7 @@ struct tegra_drm {
 	struct mutex clients_lock;
 	struct list_head clients;
 
-#ifdef CONFIG_DRM_TEGRA_FBDEV
 	struct tegra_fbdev *fbdev;
-#endif
 
 	unsigned int pitch_align;
 
@@ -263,10 +259,6 @@ int tegra_drm_fb_prepare(struct drm_device *drm);
 void tegra_drm_fb_free(struct drm_device *drm);
 int tegra_drm_fb_init(struct drm_device *drm);
 void tegra_drm_fb_exit(struct drm_device *drm);
-#ifdef CONFIG_DRM_TEGRA_FBDEV
-void tegra_fbdev_restore_mode(struct tegra_fbdev *fbdev);
-void tegra_fb_output_poll_changed(struct drm_device *drm);
-#endif
 
 extern struct platform_driver tegra_dc_driver;
 extern struct platform_driver tegra_dsi_driver;
diff --git a/drivers/gpu/drm/tegra/fb.c b/drivers/gpu/drm/tegra/fb.c
index a2d66f9..1fd595c 100644
--- a/drivers/gpu/drm/tegra/fb.c
+++ b/drivers/gpu/drm/tegra/fb.c
@@ -18,7 +18,7 @@ static inline struct tegra_fb *to_tegra_fb(struct drm_framebuffer *fb)
 	return container_of(fb, struct tegra_fb, base);
 }
 
-#ifdef CONFIG_DRM_TEGRA_FBDEV
+#ifdef CONFIG_DRM_FBDEV_EMULATION
 static inline struct tegra_fbdev *to_tegra_fbdev(struct drm_fb_helper *helper)
 {
 	return container_of(helper, struct tegra_fbdev, base);
@@ -181,7 +181,7 @@ unreference:
 	return ERR_PTR(err);
 }
 
-#ifdef CONFIG_DRM_TEGRA_FBDEV
+#ifdef CONFIG_DRM_FBDEV_EMULATION
 static struct fb_ops tegra_fb_ops = {
 	.owner = THIS_MODULE,
 	.fb_fillrect = drm_fb_helper_sys_fillrect,
@@ -355,24 +355,11 @@ static void tegra_fbdev_exit(struct tegra_fbdev *fbdev)
 	tegra_fbdev_free(fbdev);
 }
 
-void tegra_fbdev_restore_mode(struct tegra_fbdev *fbdev)
-{
-	if (fbdev)
-		drm_fb_helper_restore_fbdev_mode_unlocked(&fbdev->base);
-}
-
-void tegra_fb_output_poll_changed(struct drm_device *drm)
-{
-	struct tegra_drm *tegra = drm->dev_private;
-
-	if (tegra->fbdev)
-		drm_fb_helper_hotplug_event(&tegra->fbdev->base);
-}
 #endif
 
 int tegra_drm_fb_prepare(struct drm_device *drm)
 {
-#ifdef CONFIG_DRM_TEGRA_FBDEV
+#ifdef CONFIG_DRM_FBDEV_EMULATION
 	struct tegra_drm *tegra = drm->dev_private;
 
 	tegra->fbdev = tegra_fbdev_create(drm);
@@ -385,7 +372,7 @@ int tegra_drm_fb_prepare(struct drm_device *drm)
 
 void tegra_drm_fb_free(struct drm_device *drm)
 {
-#ifdef CONFIG_DRM_TEGRA_FBDEV
+#ifdef CONFIG_DRM_FBDEV_EMULATION
 	struct tegra_drm *tegra = drm->dev_private;
 
 	tegra_fbdev_free(tegra->fbdev);
@@ -394,7 +381,7 @@ void tegra_drm_fb_free(struct drm_device *drm)
 
 int tegra_drm_fb_init(struct drm_device *drm)
 {
-#ifdef CONFIG_DRM_TEGRA_FBDEV
+#ifdef CONFIG_DRM_FBDEV_EMULATION
 	struct tegra_drm *tegra = drm->dev_private;
 	int err;
 
@@ -409,7 +396,7 @@ int tegra_drm_fb_init(struct drm_device *drm)
 
 void tegra_drm_fb_exit(struct drm_device *drm)
 {
-#ifdef CONFIG_DRM_TEGRA_FBDEV
+#ifdef CONFIG_DRM_FBDEV_EMULATION
 	struct tegra_drm *tegra = drm->dev_private;
 
 	tegra_fbdev_exit(tegra->fbdev);
-- 
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