[PATCH 08/11] drm/tegra: Use regular fbdev I/O helpers

[Thomas Zimmermann]

Use the regular fbdev helpers for framebuffer I/O instead of DRM's
helpers. Tegra does not use damage handling, so DRM's fbdev helpers
are mere wrappers around the fbdev code.

Add CONFIG_DRM_TEGRA_FBDEV_EMULATION to select the necessary
Kconfig options automatically. Make fbdev emulation depend on
the new config option.

By using fbdev helpers directly within each DRM fbdev emulation,
we can eventually remove DRM's wrapper functions entirely.

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
Cc: Thierry Reding <thierry.reding at gmail.com>
Cc: Mikko Perttunen <mperttunen at nvidia.com>
Cc: Jonathan Hunter <jonathanh at nvidia.com>
---
 drivers/gpu/drm/tegra/Kconfig  |  9 +++++++++
 drivers/gpu/drm/tegra/Makefile |  2 +-
 drivers/gpu/drm/tegra/drm.h    |  2 +-
 drivers/gpu/drm/tegra/fbdev.c  | 11 ++++++-----
 4 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/tegra/Kconfig b/drivers/gpu/drm/tegra/Kconfig
index 56453ca277c2..8d04549ad671 100644
--- a/drivers/gpu/drm/tegra/Kconfig
+++ b/drivers/gpu/drm/tegra/Kconfig
@@ -12,6 +12,7 @@ config DRM_TEGRA
 	select DRM_KMS_HELPER
 	select DRM_MIPI_DSI
 	select DRM_PANEL
+	select DRM_TEGRA_FBDEV_EMULATION if DRM_FBDEV_EMULATION
 	select TEGRA_HOST1X
 	select INTERCONNECT
 	select IOMMU_IOVA
@@ -41,3 +42,11 @@ config DRM_TEGRA_STAGING
 	  If unsure, choose N.
 
 endif
+
+config DRM_TEGRA_FBDEV_EMULATION
+	bool
+	depends on DRM_TEGRA
+	select FB_SYS_COPYAREA
+	select FB_SYS_FILLRECT
+	select FB_SYS_FOPS
+	select FB_SYS_IMAGEBLIT
diff --git a/drivers/gpu/drm/tegra/Makefile b/drivers/gpu/drm/tegra/Makefile
index 6fc4b504e786..2ae9fb5d9213 100644
--- a/drivers/gpu/drm/tegra/Makefile
+++ b/drivers/gpu/drm/tegra/Makefile
@@ -29,6 +29,6 @@ tegra-drm-y := \
 
 tegra-drm-y += trace.o
 
-tegra-drm-$(CONFIG_DRM_FBDEV_EMULATION) += fbdev.o
+tegra-drm-$(CONFIG_DRM_TEGRA_FBDEV_EMULATION) += fbdev.o
 
 obj-$(CONFIG_DRM_TEGRA) += tegra-drm.o
diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index f9d18e8cf6ab..874e93ef4e47 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -192,7 +192,7 @@ struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
 					struct drm_file *file,
 					const struct drm_mode_fb_cmd2 *cmd);
 
-#ifdef CONFIG_DRM_FBDEV_EMULATION
+#if defined(CONFIG_DRM_TEGRA_FBDEV_EMULATION)
 void tegra_fbdev_setup(struct drm_device *drm);
 #else
 static inline void tegra_fbdev_setup(struct drm_device *drm)
diff --git a/drivers/gpu/drm/tegra/fbdev.c b/drivers/gpu/drm/tegra/fbdev.c
index dca9eccae466..144d851e566f 100644
--- a/drivers/gpu/drm/tegra/fbdev.c
+++ b/drivers/gpu/drm/tegra/fbdev.c
@@ -8,6 +8,7 @@
  */
 
 #include <linux/console.h>
+#include <linux/fb.h>
 #include <linux/vmalloc.h>
 
 #include <drm/drm_drv.h>
@@ -59,11 +60,11 @@ static void tegra_fbdev_fb_destroy(struct fb_info *info)
 static const struct fb_ops tegra_fb_ops = {
 	.owner = THIS_MODULE,
 	DRM_FB_HELPER_DEFAULT_OPS,
-	.fb_read = drm_fb_helper_sys_read,
-	.fb_write = drm_fb_helper_sys_write,
-	.fb_fillrect = drm_fb_helper_sys_fillrect,
-	.fb_copyarea = drm_fb_helper_sys_copyarea,
-	.fb_imageblit = drm_fb_helper_sys_imageblit,
+	.fb_read = fb_sys_read,
+	.fb_write = fb_sys_write,
+	.fb_fillrect = sys_fillrect,
+	.fb_copyarea = sys_copyarea,
+	.fb_imageblit = sys_imageblit,
 	.fb_mmap = tegra_fb_mmap,
 	.fb_destroy = tegra_fbdev_fb_destroy,
 };
-- 
2.40.1