From 6d24c1c5918907ab78a5729b78c0d165deb3cc2b Mon Sep 17 00:00:00 2001 From: Michael Zoran Date: Thu, 23 Feb 2017 17:54:31 -0800 Subject: [PATCH] drm/vc4: Don't wait for vblank when updating the cursor Commonly used desktop environments such as xfce4 and gnome on debian sid can flood the graphics drivers with cursor updates. Because the current implementation is waiting for a vblank between cursor updates, this will cause the display to hang for a long time since a typical refresh rate is only 60Hz. This is unnecessary and unexpected by user mode software, so simply swap out the cursor frame buffer without waiting. Signed-off-by: Michael Zoran Reviewed-by: Eric Anholt Link: http://patchwork.freedesktop.org/patch/msgid/20170224015431.24583-1-mzoran@crowfest.net --- drivers/gpu/drm/vc4/vc4_plane.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c index f7a229df572d..110224c3a3ac 100644 --- a/drivers/gpu/drm/vc4/vc4_plane.c +++ b/drivers/gpu/drm/vc4/vc4_plane.c @@ -20,6 +20,7 @@ #include "vc4_drv.h" #include "vc4_regs.h" +#include "drm_atomic.h" #include "drm_atomic_helper.h" #include "drm_fb_cma_helper.h" #include "drm_plane_helper.h" @@ -769,12 +770,6 @@ vc4_update_plane(struct drm_plane *plane, if (!plane_state) goto out; - /* If we're changing the cursor contents, do that in the - * normal vblank-synced atomic path. - */ - if (fb != plane_state->fb) - goto out; - /* No configuring new scaling in the fast path. */ if (crtc_w != plane_state->crtc_w || crtc_h != plane_state->crtc_h || @@ -783,6 +778,11 @@ vc4_update_plane(struct drm_plane *plane, goto out; } + if (fb != plane_state->fb) { + drm_atomic_set_fb_for_plane(plane->state, fb); + vc4_plane_async_set_fb(plane, fb); + } + /* Set the cursor's position on the screen. This is the * expected change from the drm_mode_cursor_universal() * helper. -- 2.20.1