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Commit 2408898e3b ("staging: vboxvideo: Add page-flip support") only
calls vbox_crtc_do_set_base() on page-flips, but despite that function's
name it only pins the new fb, unpins the old fb and sets
vbox_crtc->fb_offset. It does not program the hardware to scan out at the
new vbox_crtc->fb_offset value.
This was causing only every other frame (assuming page-flipping between 2
buffers) to be shown since we kept scanning out of the old (now unpinned!)
buffer.
This commit fixes this by adding code to vbox_crtc_page_flip() to tell
the hardware to scanout from the new fb_offset.
Fixes: 2408898e3b ("staging: vboxvideo: Add page-flip support")
Cc: Steve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
65aac17423