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drm/cirrus: Enable damage clipping on primary plane

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Enable damage clipping on the primary plane and iterate over small
areas of reported framebuffer damage. Avoid the overhead of permanent
full-screen updates that cirrus currently implements.

This problem is indicated by the warning

  drm_plane_enable_fb_damage_clips() not called

in the kernel's log. Without damage clipping, drivers do full updates
of the screen area. This is costly as many screen updates, such as
cursor movement or command-line input, only change a small portion
of the output. Damage clipping allows renderers to inform drivers about
the changed areas.

With the damage information known, cirrus now iterates over a list of
change areas and only flushes those to the hardware's scanout buffer.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230215161517.5113-10-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2023-02-15 17:15:09 +01:00
parent d99c028941
commit 03e7ac67e7
1 changed files with 7 additions and 3 deletions
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10
drivers/gpu/drm/tiny/cirrus.c
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@ -393,7 +393,8 @@ static void cirrus_primary_plane_helper_atomic_update(struct drm_plane *plane,
struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
struct drm_framebuffer *fb = plane_state->fb;
struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
struct drm_rect rect;
struct drm_atomic_helper_damage_iter iter;
struct drm_rect damage;
int idx;
if (!fb)
@ -407,8 +408,10 @@ static void cirrus_primary_plane_helper_atomic_update(struct drm_plane *plane,
if (cirrus->pitch != cirrus_pitch(fb))
cirrus_pitch_set(cirrus, fb);
if (drm_atomic_helper_damage_merged(old_plane_state, plane_state, &rect))
cirrus_fb_blit_rect(fb, &shadow_plane_state->data[0], &rect);
drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
drm_atomic_for_each_plane_damage(&iter, &damage) {
cirrus_fb_blit_rect(fb, &shadow_plane_state->data[0], &damage);
}
drm_dev_exit(idx);
}
@ -529,6 +532,7 @@ static int cirrus_pipe_init(struct cirrus_device *cirrus)
if (ret)
return ret;
drm_plane_helper_add(primary_plane, &cirrus_primary_plane_helper_funcs);
drm_plane_enable_fb_damage_clips(primary_plane);
crtc = &cirrus->crtc;
ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,