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drm/nouveau/disp/nv04-nv40: abort scanoutpos query on vga analog.

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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@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Cc: <stable@vger.kernel.org> # 3.14+
This commit is contained in:
Mario Kleiner 2014-05-28 05:22:18 +02:00 committed by Ben Skeggs
parent 56d237d268
commit e291af3f22
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/nouveau/core/engine/disp/nv04.c
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@ -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());