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video: Add generic fixup handler to reserve fb memory 

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@pengutronix.de>
This commit is contained in:
Sascha Hauer 2015-07-06 12:25:11 +02:00
parent 7be1519c69
commit 2f5f0d6aa1
2 changed files with 22 additions and 0 deletions
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21
drivers/video/fb.c
View File

@ -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;

1
include/fb.h
View File

@ -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 */