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drm/omap: add support for manually updated displays

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This adds the required infrastructure for manually updated displays,
such as DSI command mode panels. While those panels often support
partial updates we currently always do a full refresh.

The display will be refreshed when something calls the dirty callback,
such as libdrm's drmModeDirtyFB(). This is currently being done at least
by the kernel console and Xorg (with modesetting driver) in their
default configuration. Weston does not implement this and the fbdev
backend does not work (display will not update). Weston's DRM backend
uses double buffering and the page flip will also trigger a display
refresh.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Sebastian Reichel
2019-05-23 22:07:56 +02:00
committed by Tomi Valkeinen
parent 47103a80f5
commit 1bb418bffd
3 changed files with 129 additions and 5 deletions
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19
drivers/gpu/drm/omapdrm/omap_fb.c
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@@ -66,8 +66,27 @@ struct omap_framebuffer {
struct mutex lock;
};
static int omap_framebuffer_dirty(struct drm_framebuffer *fb,
struct drm_file *file_priv,
unsigned flags, unsigned color,
struct drm_clip_rect *clips,
unsigned num_clips)
{
struct drm_crtc *crtc;
drm_modeset_lock_all(fb->dev);
drm_for_each_crtc(crtc, fb->dev)
omap_crtc_flush(crtc);
drm_modeset_unlock_all(fb->dev);
return 0;
}
static const struct drm_framebuffer_funcs omap_framebuffer_funcs = {
.create_handle = drm_gem_fb_create_handle,
.dirty = omap_framebuffer_dirty,
.destroy = drm_gem_fb_destroy,
};