From: Mario Kleiner Date: Wed, 28 May 2014 03:22:18 +0000 (+0200) Subject: drm/nouveau/disp/nv04-nv40: abort scanoutpos query on vga analog. X-Git-Tag: firefly_0821_release~176^2~3773^2~2^2~3 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e291af3f2259e9e105dfd72416fd5796513791a4;p=firefly-linux-kernel-4.4.55.git 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+ --- diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nv04.c b/drivers/gpu/drm/nouveau/core/engine/disp/nv04.c index 6c89af792889..94a2cc69ec2c 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());