DP AUX busses can both be accessed by DRM, and through any of the
userspace dev nodes in /dev/drm_dp_auxN. We need to make sure the GPU
stays on in all of these codepaths.
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Cc: Karol Herbst <karolherbst@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/gpu/drm/nouveau/nvkm/subdev/i2c/aux.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/aux.c b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/aux.c
index 4c1f547da463..6276b113065c 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/aux.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/aux.c
@@ -98,18 +98,28 @@ nvkm_i2c_aux_release(struct nvkm_i2c_aux *aux)
AUX_TRACE(aux, "release");
nvkm_i2c_pad_release(pad);
mutex_unlock(&aux->mutex);
+ pm_runtime_put_autosuspend(pad->i2c->subdev.device->dev);
}
int
nvkm_i2c_aux_acquire(struct nvkm_i2c_aux *aux)
{
struct nvkm_i2c_pad *pad = aux->pad;
+ struct device *dev = pad->i2c->subdev.device->dev;
int ret;
+
AUX_TRACE(aux, "acquire");
+
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0 && ret != -EACCES)
+ return ret;
+
mutex_lock(&aux->mutex);
ret = nvkm_i2c_pad_acquire(pad, NVKM_I2C_PAD_AUX);
- if (ret)
+ if (ret) {
mutex_unlock(&aux->mutex);
+ pm_runtime_put_autosuspend(dev);
+ }
return ret;
}
--
2.17.1
