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GitHub Repository: orangepi-xunlong/orangepi-build
 Path: blob/next/external/patch/misc/0003-bootsplash.patch
Views: 3959
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diff --git a/drivers/video/fbdev/core/bootsplash.c b/drivers/video/fbdev/core/bootsplash.c

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index 843c5400fefc..815b007f81ca 100644

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--- a/drivers/video/fbdev/core/bootsplash.c

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+++ b/drivers/video/fbdev/core/bootsplash.c

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@@ -112,6 +112,8 @@ void bootsplash_render_full(struct fb_info *info)

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 	bootsplash_do_render_pictures(info, splash_state.file);

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+	bootsplash_do_render_flush(info);

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+

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 out:

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 	mutex_unlock(&splash_state.data_lock);

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 }

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diff --git a/drivers/video/fbdev/core/bootsplash_internal.h b/drivers/video/fbdev/core/bootsplash_internal.h

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index 71e2a27ac0b8..0acb383aa4e3 100644

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--- a/drivers/video/fbdev/core/bootsplash_internal.h

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+++ b/drivers/video/fbdev/core/bootsplash_internal.h

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@@ -89,6 +89,7 @@ void bootsplash_do_render_background(struct fb_info *info,

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 				     const struct splash_file_priv *fp);

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 void bootsplash_do_render_pictures(struct fb_info *info,

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 				   const struct splash_file_priv *fp);

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+void bootsplash_do_render_flush(struct fb_info *info);

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 void bootsplash_free_file(struct splash_file_priv *fp);

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diff --git a/drivers/video/fbdev/core/bootsplash_render.c b/drivers/video/fbdev/core/bootsplash_render.c

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index 2ae36949d0e3..8c09c306ff67 100644

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--- a/drivers/video/fbdev/core/bootsplash_render.c

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+++ b/drivers/video/fbdev/core/bootsplash_render.c

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@@ -186,3 +186,36 @@ void bootsplash_do_render_pictures(struct fb_info *info,

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 				pp->pic_header->width, pp->pic_header->height);

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 	}

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 }

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+

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+

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+void bootsplash_do_render_flush(struct fb_info *info)

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+{

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+	/*

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+	 * FB drivers using deferred_io (such as Xen) need to sync the

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+	 * screen after modifying its contents. When the FB is mmap()ed

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+	 * from userspace, this happens via a dirty pages callback, but

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+	 * when modifying the FB from the kernel, there is no such thing.

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+	 *

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+	 * So let's issue a fake fb_copyarea (copying the FB onto itself)

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+	 * to trick the FB driver into syncing the screen.

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+	 *

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+	 * A few DRM drivers' FB implementations are broken by not using

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+	 * deferred_io when they really should - we match on the known

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+	 * bad ones manually for now.

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+	 */

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+	if (info->fbdefio

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+	    || !strcmp(info->fix.id, "astdrmfb")

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+	    || !strcmp(info->fix.id, "cirrusdrmfb")

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+	    || !strcmp(info->fix.id, "mgadrmfb")) {

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+		struct fb_copyarea area;

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+

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+		area.dx = 0;

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+		area.dy = 0;

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+		area.width = info->var.xres;

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+		area.height = info->var.yres;

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+		area.sx = 0;

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+		area.sy = 0;

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+

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+		info->fbops->fb_copyarea(info, &area);

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+	}

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+}

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