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drm: don't override possible_crtcs for primary/cursor planes 

It is kind of a pointless restriction.  If userspace does silly things
like using crtcA's cursor plane on crtcB, and then setcursor on crtcA,
it will end up with the overlay disabled on crtcB.  But userspace is
allowed to shoot itself like this.

v2: don't WARN_ON() if caller did not set ->possible_crtcs.  This keeps
    the existing behavior by default, if caller does not set the
    ->possible_crtcs.

Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1478357521-26542-1-git-send-email-robdclark@gmail.com
This commit is contained in:
Rob Clark 2016-11-05 10:52:01 -04:00 committed by Daniel Vetter
parent 91d5ee0451
commit 7abc7d4751
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/drm_crtc.c
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@ -229,9 +229,9 @@ int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
crtc->primary = primary;
crtc->cursor = cursor;
if (primary)
if (primary && !primary->possible_crtcs)
primary->possible_crtcs = 1 << drm_crtc_index(crtc);
if (cursor)
if (cursor && !cursor->possible_crtcs)
cursor->possible_crtcs = 1 << drm_crtc_index(crtc);
ret = drm_crtc_crc_init(crtc);