3.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mario Kleiner <mario.kleiner.de@xxxxxxxxx> commit e291af3f2259e9e105dfd72416fd5796513791a4 upstream. nv04_disp_scanoutpos() must abort to trigger simple timestamping fallback if vtotal/htotal regs return zero. This happens if the output isn't a digital output, but a vga analog output, as the regs don't get initialized in that case. Fixes timestamping failure on nv-40 and earlier with vga output. Signed-off-by: Mario Kleiner <mario.kleiner.de@xxxxxxxxx> Signed-off-by: Ben Skeggs <bskeggs@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/nouveau/core/engine/disp/nv04.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/gpu/drm/nouveau/core/engine/disp/nv04.c +++ b/drivers/gpu/drm/nouveau/core/engine/disp/nv04.c @@ -51,6 +51,14 @@ nv04_disp_scanoutpos(struct nouveau_obje args->htotal = nv_rd32(priv, 0x680824 + (head * 0x2000)) & 0xffff; args->hblanke = args->htotal - 1; + /* + * If output is vga instead of digital then vtotal/htotal is invalid + * so we have to give up and trigger the timestamping fallback in the + * drm core. + */ + if (!args->vtotal || !args->htotal) + return -ENOTSUPP; + args->time[0] = ktime_to_ns(ktime_get()); line = nv_rd32(priv, 0x600868 + (head * 0x2000)); args->time[1] = ktime_to_ns(ktime_get()); -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html