[PATCH v3 12/12] drm/i915: Implement dedicated fbdev I/O helpers

[Thomas Zimmermann <tzimmermann@suse.de>]

Implement dedicated fbdev helpers for framebuffer I/O instead
of using DRM's helpers. i915 was the only caller of the DRM
helpers, so remove them from the helper module.

v2:
	* use FB_IO_HELPERS options

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/Kconfig                    |   3 -
 drivers/gpu/drm/drm_fb_helper.c            | 107 ---------------------
 drivers/gpu/drm/i915/Kconfig               |   1 +
 drivers/gpu/drm/i915/display/intel_fbdev.c |  51 ++++++++--
 include/drm/drm_fb_helper.h                |  39 --------
 5 files changed, 46 insertions(+), 155 deletions(-)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 92a782827b7b..bb2e48cc6cd6 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -133,9 +133,6 @@ config DRM_FBDEV_EMULATION
 	bool "Enable legacy fbdev support for your modesetting driver"
 	depends on DRM_KMS_HELPER
 	depends on FB=y || FB=DRM_KMS_HELPER
-	select FB_CFB_FILLRECT
-	select FB_CFB_COPYAREA
-	select FB_CFB_IMAGEBLIT
 	select FRAMEBUFFER_CONSOLE if !EXPERT
 	select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE
 	default y
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index ba0a808f14ee..5927896ad8f6 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -729,113 +729,6 @@ void drm_fb_helper_deferred_io(struct fb_info *info, struct list_head *pagerefli
 }
 EXPORT_SYMBOL(drm_fb_helper_deferred_io);
 
-/**
- * drm_fb_helper_cfb_read - Implements struct &fb_ops.fb_read for I/O memory
- * @info: fb_info struct pointer
- * @buf: userspace buffer to read from framebuffer memory
- * @count: number of bytes to read from framebuffer memory
- * @ppos: read offset within framebuffer memory
- *
- * Returns:
- * The number of bytes read on success, or an error code otherwise.
- */
-ssize_t drm_fb_helper_cfb_read(struct fb_info *info, char __user *buf,
-			       size_t count, loff_t *ppos)
-{
-	return fb_io_read(info, buf, count, ppos);
-}
-EXPORT_SYMBOL(drm_fb_helper_cfb_read);
-
-/**
- * drm_fb_helper_cfb_write - Implements struct &fb_ops.fb_write for I/O memory
- * @info: fb_info struct pointer
- * @buf: userspace buffer to write to framebuffer memory
- * @count: number of bytes to write to framebuffer memory
- * @ppos: write offset within framebuffer memory
- *
- * Returns:
- * The number of bytes written on success, or an error code otherwise.
- */
-ssize_t drm_fb_helper_cfb_write(struct fb_info *info, const char __user *buf,
-				size_t count, loff_t *ppos)
-{
-	struct drm_fb_helper *helper = info->par;
-	loff_t pos = *ppos;
-	ssize_t ret;
-	struct drm_rect damage_area;
-
-	ret = fb_io_write(info, buf, count, ppos);
-	if (ret <= 0)
-		return ret;
-
-	if (helper->funcs->fb_dirty) {
-		drm_fb_helper_memory_range_to_clip(info, pos, ret, &damage_area);
-		drm_fb_helper_damage(helper, damage_area.x1, damage_area.y1,
-				     drm_rect_width(&damage_area),
-				     drm_rect_height(&damage_area));
-	}
-
-	return ret;
-}
-EXPORT_SYMBOL(drm_fb_helper_cfb_write);
-
-/**
- * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
- * @info: fbdev registered by the helper
- * @rect: info about rectangle to fill
- *
- * A wrapper around cfb_fillrect implemented by fbdev core
- */
-void drm_fb_helper_cfb_fillrect(struct fb_info *info,
-				const struct fb_fillrect *rect)
-{
-	struct drm_fb_helper *helper = info->par;
-
-	cfb_fillrect(info, rect);
-
-	if (helper->funcs->fb_dirty)
-		drm_fb_helper_damage(helper, rect->dx, rect->dy, rect->width, rect->height);
-}
-EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
-
-/**
- * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
- * @info: fbdev registered by the helper
- * @area: info about area to copy
- *
- * A wrapper around cfb_copyarea implemented by fbdev core
- */
-void drm_fb_helper_cfb_copyarea(struct fb_info *info,
-				const struct fb_copyarea *area)
-{
-	struct drm_fb_helper *helper = info->par;
-
-	cfb_copyarea(info, area);
-
-	if (helper->funcs->fb_dirty)
-		drm_fb_helper_damage(helper, area->dx, area->dy, area->width, area->height);
-}
-EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
-
-/**
- * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
- * @info: fbdev registered by the helper
- * @image: info about image to blit
- *
- * A wrapper around cfb_imageblit implemented by fbdev core
- */
-void drm_fb_helper_cfb_imageblit(struct fb_info *info,
-				 const struct fb_image *image)
-{
-	struct drm_fb_helper *helper = info->par;
-
-	cfb_imageblit(info, image);
-
-	if (helper->funcs->fb_dirty)
-		drm_fb_helper_damage(helper, image->dx, image->dy, image->width, image->height);
-}
-EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
-
 /**
  * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
  * @fb_helper: driver-allocated fbdev helper, can be NULL
diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index e4f4d2e3fdfe..01b5a8272a27 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -17,6 +17,7 @@ config DRM_I915
 	select DRM_KMS_HELPER
 	select DRM_PANEL
 	select DRM_MIPI_DSI
+	select FB_IO_HELPERS if DRM_FBDEV_EMULATION
 	select RELAY
 	select I2C
 	select I2C_ALGOBIT
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index aab1ae74a8f7..64aeacef703d 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -28,6 +28,7 @@
 #include <linux/console.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
+#include <linux/fb.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
@@ -84,6 +85,20 @@ static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
 	intel_frontbuffer_invalidate(to_frontbuffer(ifbdev), ORIGIN_CPU);
 }
 
+static ssize_t intel_fbdev_fb_write(struct fb_info *info, const char __user *buf,
+				    size_t count, loff_t *ppos)
+{
+	struct drm_fb_helper *helper = info->par;
+	loff_t pos = *ppos;
+	ssize_t ret;
+
+	ret = fb_io_write(info, buf, count, ppos);
+	if (ret > 0)
+		drm_fb_helper_damage_range(helper, pos, ret);
+
+	return ret;
+}
+
 static int intel_fbdev_set_par(struct fb_info *info)
 {
 	struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
@@ -121,6 +136,30 @@ static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
 	return ret;
 }
 
+static void intel_fbdev_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
+{
+	struct drm_fb_helper *helper = info->par;
+
+	cfb_fillrect(info, rect);
+	drm_fb_helper_damage(helper, rect->dx, rect->dy, rect->width, rect->height);
+}
+
+static void intel_fbdev_fb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
+{
+	struct drm_fb_helper *helper = info->par;
+
+	cfb_copyarea(info, area);
+	drm_fb_helper_damage(helper, area->dx, area->dy, area->width, area->height);
+}
+
+static void intel_fbdev_fb_imageblit(struct fb_info *info, const struct fb_image *image)
+{
+	struct drm_fb_helper *helper = info->par;
+
+	cfb_imageblit(info, image);
+	drm_fb_helper_damage(helper, image->dx, image->dy, image->width, image->height);
+}
+
 static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
 {
 	struct intel_fbdev *fbdev = to_intel_fbdev(info->par);
@@ -134,13 +173,13 @@ static const struct fb_ops intelfb_ops = {
 	.owner = THIS_MODULE,
 	DRM_FB_HELPER_DEFAULT_OPS,
 	.fb_set_par = intel_fbdev_set_par,
-	.fb_read = drm_fb_helper_cfb_read,
-	.fb_write = drm_fb_helper_cfb_write,
-	.fb_fillrect = drm_fb_helper_cfb_fillrect,
-	.fb_copyarea = drm_fb_helper_cfb_copyarea,
-	.fb_imageblit = drm_fb_helper_cfb_imageblit,
-	.fb_pan_display = intel_fbdev_pan_display,
+	.fb_read = fb_io_read,
+	.fb_write = intel_fbdev_fb_write,
 	.fb_blank = intel_fbdev_blank,
+	.fb_pan_display = intel_fbdev_pan_display,
+	.fb_fillrect = intel_fbdev_fb_fillrect,
+	.fb_copyarea = intel_fbdev_fb_copyarea,
+	.fb_imageblit = intel_fbdev_fb_imageblit,
 	.fb_mmap = intel_fbdev_mmap,
 };
 
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index e3240d749a43..15f03d8fb5cd 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -259,18 +259,6 @@ void drm_fb_helper_damage_range(struct drm_fb_helper *helper, off_t off, size_t
 
 void drm_fb_helper_deferred_io(struct fb_info *info, struct list_head *pagereflist);
 
-ssize_t drm_fb_helper_cfb_read(struct fb_info *info, char __user *buf,
-			       size_t count, loff_t *ppos);
-ssize_t drm_fb_helper_cfb_write(struct fb_info *info, const char __user *buf,
-				size_t count, loff_t *ppos);
-
-void drm_fb_helper_cfb_fillrect(struct fb_info *info,
-				const struct fb_fillrect *rect);
-void drm_fb_helper_cfb_copyarea(struct fb_info *info,
-				const struct fb_copyarea *area);
-void drm_fb_helper_cfb_imageblit(struct fb_info *info,
-				 const struct fb_image *image);
-
 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend);
 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
 					bool suspend);
@@ -386,33 +374,6 @@ static inline int drm_fb_helper_defio_init(struct drm_fb_helper *fb_helper)
 	return -ENODEV;
 }
 
-static inline ssize_t drm_fb_helper_cfb_read(struct fb_info *info, char __user *buf,
-					     size_t count, loff_t *ppos)
-{
-	return -ENODEV;
-}
-
-static inline ssize_t drm_fb_helper_cfb_write(struct fb_info *info, const char __user *buf,
-					      size_t count, loff_t *ppos)
-{
-	return -ENODEV;
-}
-
-static inline void drm_fb_helper_cfb_fillrect(struct fb_info *info,
-					      const struct fb_fillrect *rect)
-{
-}
-
-static inline void drm_fb_helper_cfb_copyarea(struct fb_info *info,
-					      const struct fb_copyarea *area)
-{
-}
-
-static inline void drm_fb_helper_cfb_imageblit(struct fb_info *info,
-					       const struct fb_image *image)
-{
-}
-
 static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper,
 					     bool suspend)
 {
-- 
2.40.1