The i2c bus can be both accessed by DRM itself, along with any of it's
devnodes (/sys/class/i2c). So, we need to make sure that all codepaths
using the i2c bus keep the GPU resumed.
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Cc: Karol Herbst <karolherbst@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/gpu/drm/nouveau/nvkm/subdev/i2c/bus.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/bus.c b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/bus.c
index 807a2b67bd64..1de48c990b80 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/bus.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/bus.c
@@ -119,18 +119,28 @@ nvkm_i2c_bus_release(struct nvkm_i2c_bus *bus)
BUS_TRACE(bus, "release");
nvkm_i2c_pad_release(pad);
mutex_unlock(&bus->mutex);
+ pm_runtime_put_autosuspend(pad->i2c->subdev.device->dev);
}
int
nvkm_i2c_bus_acquire(struct nvkm_i2c_bus *bus)
{
struct nvkm_i2c_pad *pad = bus->pad;
+ struct device *dev = pad->i2c->subdev.device->dev;
int ret;
+
BUS_TRACE(bus, "acquire");
+
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0 && ret != -EACCES)
+ return ret;
+
mutex_lock(&bus->mutex);
ret = nvkm_i2c_pad_acquire(pad, NVKM_I2C_PAD_I2C);
- if (ret)
+ if (ret) {
mutex_unlock(&bus->mutex);
+ pm_runtime_put_autosuspend(dev);
+ }
return ret;
}
--
2.17.1
