diff options
| author | Thomas Zimmermann <tzimmermann@suse.de> | 2020-11-03 10:30:15 +0100 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2020-11-09 09:20:00 +0100 |
| commit | 222ec45f4c69dfa8cd02c72928147ac06dffffa2 (patch) | |
| tree | 8d308eeaecb657f1924c06503d55591f8f0ffc4e /include/drm | |
| parent | b4e7090c242ec64bfa77a69ea7c3cceba21c7a65 (diff) | |
| download | linux-222ec45f4c69dfa8cd02c72928147ac06dffffa2.tar.bz2 | |
drm/fb_helper: Support framebuffers in I/O memory
At least sparc64 requires I/O-specific access to framebuffers. This
patch updates the fbdev console accordingly.
For drivers with direct access to the framebuffer memory, the callback
functions in struct fb_ops test for the type of memory and call the rsp
fb_sys_ of fb_cfb_ functions. Read and write operations are implemented
internally by DRM's fbdev helper.
For drivers that employ a shadow buffer, fbdev's blit function retrieves
the framebuffer address as struct dma_buf_map, and uses dma_buf_map
interfaces to access the buffer.
The bochs driver on sparc64 uses a workaround to flag the framebuffer as
I/O memory and avoid a HW exception. With the introduction of struct
dma_buf_map, this is not required any longer. The patch removes the rsp
code from both, bochs and fbdev.
v7:
* use min_t(size_t,) (kernel test robot)
* return the number of bytes read/written, if any (fbdev testcase)
v5:
* implement fb_read/fb_write internally (Daniel, Sam)
v4:
* move dma_buf_map changes into separate patch (Daniel)
* TODO list: comment on fbdev updates (Daniel)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Tested-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20201103093015.1063-11-tzimmermann@suse.de
Diffstat (limited to 'include/drm')
| -rw-r--r-- | include/drm/drm_mode_config.h | 12 |
1 files changed, 0 insertions, 12 deletions
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h index 5ffbb4ed5b35..ab424ddd7665 100644 --- a/include/drm/drm_mode_config.h +++ b/include/drm/drm_mode_config.h @@ -878,18 +878,6 @@ struct drm_mode_config { bool prefer_shadow_fbdev; /** - * @fbdev_use_iomem: - * - * Set to true if framebuffer reside in iomem. - * When set to true memcpy_toio() is used when copying the framebuffer in - * drm_fb_helper.drm_fb_helper_dirty_blit_real(). - * - * FIXME: This should be replaced with a per-mapping is_iomem - * flag (like ttm does), and then used everywhere in fbdev code. - */ - bool fbdev_use_iomem; - - /** * @quirk_addfb_prefer_xbgr_30bpp: * * Special hack for legacy ADDFB to keep nouveau userspace happy. Should |