diff options
| -rw-r--r-- | drivers/gpu/drm/gud/gud_pipe.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/gpu/drm/gud/gud_pipe.c b/drivers/gpu/drm/gud/gud_pipe.c index e0fb6cc969a3..8f56bf618ac2 100644 --- a/drivers/gpu/drm/gud/gud_pipe.c +++ b/drivers/gpu/drm/gud/gud_pipe.c @@ -24,6 +24,19 @@ #include "gud_internal.h" /* + * Some userspace rendering loops runs all displays in the same loop. + * This means that a fast display will have to wait for a slow one. + * For this reason gud does flushing asynchronous by default. + * The down side is that in e.g. a single display setup userspace thinks + * the display is insanely fast since the driver reports back immediately + * that the flush/pageflip is done. This wastes CPU and power. + * Such users might want to set this module parameter to false. + */ +static bool gud_async_flush = true; +module_param_named(async_flush, gud_async_flush, bool, 0644); +MODULE_PARM_DESC(async_flush, "Enable asynchronous flushing [default=true]"); + +/* * FIXME: The driver is probably broken on Big Endian machines. * See discussion: * https://lore.kernel.org/dri-devel/CAKb7UvihLX0hgBOP3VBG7O+atwZcUVCPVuBdfmDMpg0NjXe-cQ@mail.gmail.com/ @@ -578,6 +591,8 @@ void gud_pipe_update(struct drm_simple_display_pipe *pipe, if (gdrm->flags & GUD_DISPLAY_FLAG_FULL_UPDATE) drm_rect_init(&damage, 0, 0, fb->width, fb->height); gud_fb_queue_damage(gdrm, fb, &damage); + if (!gud_async_flush) + flush_work(&gdrm->work); } if (!crtc->state->enable) |