media: stm32-dcmi: fix check of pm_runtime_get_sync return value

Start streaming was sometimes failing because of pm_runtime_get_sync()
non-0 return value. In fact return value was not an error but a
positive value (1), indicating that PM was already enabled.
Fix this by going to error path only with negative return value.

Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
index 5fe5b38..37e9fb0 100644 (file)
--- a/drivers/media/platform/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/stm32/stm32-dcmi.c
@@ -570,9 +570,9 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
        int ret;
 
        ret = pm_runtime_get_sync(dcmi->dev);
-       if (ret) {
-               dev_err(dcmi->dev, "%s: Failed to start streaming, cannot get sync\n",
-                       __func__);
+       if (ret < 0) {
+               dev_err(dcmi->dev, "%s: Failed to start streaming, cannot get sync (%d)\n",
+                       __func__, ret);
                goto err_release_buffers;
        }