When a framebuffer is kept enabled when Linux starts its framebuffer
memory should be reserved. Otherwise Linux may overwrite its contents.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/video/fb.c | 21 +++++++++++++++++++++
include/fb.h | 1 +
2 files changed, 22 insertions(+)
diff --git a/drivers/video/fb.c b/drivers/video/fb.c
index e30ab59..931c99c 100644
--- a/drivers/video/fb.c
+++ b/drivers/video/fb.c
@@ -103,6 +103,27 @@ static int fb_setup_mode(struct fb_info *info)
return 0;
}
+static int fb_of_reserve_fixup(struct device_node *root, void *context)
+{
+ struct fb_info *info = context;
+
+ if (!info->enabled)
+ return 0;
+
+ of_add_reserve_entry((unsigned long)info->screen_base,
+ (unsigned long)info->screen_base + info->screen_size);
+
+ return 0;
+}
+
+void fb_of_reserve_add_fixup(struct fb_info *info)
+{
+ if (!IS_ENABLED(CONFIG_OFDEVICE))
+ return;
+
+ of_register_fixup(fb_of_reserve_fixup, info);
+}
+
static int fb_set_modename(struct param_d *param, void *priv)
{
struct fb_info *info = priv;
diff --git a/include/fb.h b/include/fb.h
index 2db6ad6..a693f4b 100644
--- a/include/fb.h
+++ b/include/fb.h
@@ -159,5 +159,6 @@ int fb_register_simplefb(struct fb_info *info);
int edid_to_display_timings(struct display_timings *, unsigned char *edid);
void *edid_read_i2c(struct i2c_adapter *adapter);
void fb_edid_add_modes(struct fb_info *info);
+void fb_of_reserve_add_fixup(struct fb_info *info);
#endif /* __FB_H */
--
2.1.4
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