lkml.org 
[lkml]   [2018]   [Jul]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/2] staging: vboxvideo: Add page-flip support
Date
Adds crtc page-flip support by passing the new requested framebuffer
to vbox_crtc_do_set_base().

Note there is no attempt to support vblank interrupts, it's not
not known how to do this in VBOX or if it is even possible. Since
this page-flip implementation does not try to sync the page-flip
to vertical blanking, tearing effects are possible.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
---
drivers/staging/vboxvideo/vbox_mode.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)

diff --git a/drivers/staging/vboxvideo/vbox_mode.c b/drivers/staging/vboxvideo/vbox_mode.c
index 688e80d..285d8ad 100644
--- a/drivers/staging/vboxvideo/vbox_mode.c
+++ b/drivers/staging/vboxvideo/vbox_mode.c
@@ -308,6 +308,31 @@ static int vbox_crtc_mode_set(struct drm_crtc *crtc,
return ret;
}

+static int vbox_crtc_page_flip(struct drm_crtc *crtc,
+ struct drm_framebuffer *fb,
+ struct drm_pending_vblank_event *event,
+ uint32_t page_flip_flags,
+ struct drm_modeset_acquire_ctx *ctx)
+{
+ struct vbox_private *vbox = crtc->dev->dev_private;
+ struct drm_device *drm = vbox->dev;
+ unsigned long flags;
+ int rc;
+
+ rc = vbox_crtc_do_set_base(crtc, CRTC_FB(crtc), fb, 0, 0);
+ if (rc)
+ return rc;
+
+ spin_lock_irqsave(&drm->event_lock, flags);
+
+ if (event)
+ drm_crtc_send_vblank_event(crtc, event);
+
+ spin_unlock_irqrestore(&drm->event_lock, flags);
+
+ return 0;
+}
+
static void vbox_crtc_disable(struct drm_crtc *crtc)
{
}
@@ -346,6 +371,7 @@ static const struct drm_crtc_funcs vbox_crtc_funcs = {
.reset = vbox_crtc_reset,
.set_config = drm_crtc_helper_set_config,
/* .gamma_set = vbox_crtc_gamma_set, */
+ .page_flip = vbox_crtc_page_flip,
.destroy = vbox_crtc_destroy,
};

--
2.7.4
\
 
 \ /
  Last update: 2018-07-20 19:18    [W:0.027 / U:1.152 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site