drm/gf119-/disp: fix nasty bug which can clobber SOR0's clock setup

Fixes a LVDS bleed issue on Lenovo W530 that can occur under a
number of circumstances.

Cc: <stable@vger.kernel.org > # v3.9+
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c b/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
index 7762665ad8fdb5b461680ee84b7b224b77a5d4d5..876de9ac3793fd30af193ac7e8410818bdb56e7a 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
@@ -1009,7 +1009,7 @@ exec_clkcmp(struct nv50_disp_priv *priv, int head, int id,
        }
 
        if (outp == 8)
-               return false;
+               return conf;
 
        data = exec_lookup(priv, head, outp, ctrl, dcb, &ver, &hdr, &cnt, &len, &info1);
        if (data == 0x0000)