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drm/fb_helper: Create a wrapper for unlink_framebuffer

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Some drm drivers call unlink_framebuffer. Create a drm_fb_helper function
that wraps around these calls.

This is part of an effort to prevent drm drivers from calling fbdev
functions directly, in order to make fbdev emulation a top level drm
option.

v2:
- Added kerneldocs
- Added a check for non-NULL fb_helper before proceeding. This will
  make the helpers work when we have a module param for fbdev emulation

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Archit Taneja 2015-07-22 14:57:57 +05:30 committed by Daniel Vetter
parent b8017d6c33
commit 47074ab795
2 changed files with 15 additions and 0 deletions
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13
drivers/gpu/drm/drm_fb_helper.c
View File

@ -748,6 +748,19 @@ void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
}
EXPORT_SYMBOL(drm_fb_helper_fini);
/**
* drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
* @fb_helper: driver-allocated fbdev helper
*
* A wrapper around unlink_framebuffer implemented by fbdev core
*/
void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
{
if (fb_helper && fb_helper->fbdev)
unlink_framebuffer(fb_helper->fbdev);
}
EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
u16 blue, u16 regno, struct fb_info *info)
{

2
include/drm/drm_fb_helper.h
View File

@ -145,6 +145,8 @@ void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helpe
void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
uint32_t depth);
void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper);
int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);