From e291af3f2259e9e105dfd72416fd5796513791a4 Mon Sep 17 00:00:00 2001 From: Mario Kleiner Date: Wed, 28 May 2014 05:22:18 +0200 Subject: [PATCH] drm/nouveau/disp/nv04-nv40: abort scanoutpos query on vga analog. 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 Signed-off-by: Ben Skeggs Cc: # 3.14+ --- drivers/gpu/drm/nouveau/core/engine/disp/nv04.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nv04.c b/drivers/gpu/drm/nouveau/core/engine/disp/nv04.c index 6c89af7..94a2cc6 100644 --- 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_object *object, u32 mthd, 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()); -- 2.7.4