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drm/vc4: Don't wait for vblank when updating the cursor

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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 <mzoran@crowfest.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: http://patchwork.freedesktop.org/patch/msgid/20170224015431.24583-1-mzoran@crowfest.net
This commit is contained in:
Michael Zoran 2017-02-23 17:54:31 -08:00 committed by Eric Anholt
parent fb4fe33f93
commit 6d24c1c591
1 changed files with 6 additions and 6 deletions
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12
drivers/gpu/drm/vc4/vc4_plane.c
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@ -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.