media: pxa_camera: ignore -ENOIOCTLCMD from v4l2_subdev_call for s_power

When the subdevice doesn't provide s_power core ops callback, the
v4l2_subdev_call for s_power returns -ENOIOCTLCMD.  If the subdevice
doesn't have the special handling for its power saving mode, the s_power
isn't required.  So -ENOIOCTLCMD from the v4l2_subdev_call should be
ignored.

Actually the -ENOIOCTLCMD is ignored in this driver's suspend/resume,
but the others treat the -ENOIOCTLCMD as an error.

This prepares a wrapper function to ignore -ENOIOCTLCMD and replaces
all s_power calls with it.

This also adds warning message when s_power() is failed.

Cc: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

1 files changed, 23 insertions, 12 deletions

diff --git a/drivers/media/platform/pxa_camera.c b/drivers/media/platform/pxa_camera.c
index c792cb178a84..4d5a26b4cdda 100644
--- a/drivers/media/platform/pxa_camera.c
+++ b/drivers/media/platform/pxa_camera.c
@@ -2030,6 +2030,22 @@ static int pxac_vidioc_s_input(struct file *file, void *priv, unsigned int i)
         return 0;
 }
 
+static int pxac_sensor_set_power(struct pxa_camera_dev *pcdev, int on)
+{
+        int ret;
+
+        ret = sensor_call(pcdev, core, s_power, on);
+        if (ret == -ENOIOCTLCMD)
+                ret = 0;
+        if (ret) {
+                dev_warn(pcdev_to_dev(pcdev),
+                         "Failed to put subdevice in %s mode: %d\n",
+                         on ? "normal operation" : "power saving", ret);
+        }
+
+        return ret;
+}
+
 static int pxac_fops_camera_open(struct file *filp)
 {
         struct pxa_camera_dev *pcdev = video_drvdata(filp);
@@ -2043,7 +2059,7 @@ static int pxac_fops_camera_open(struct file *filp)
         if (!v4l2_fh_is_singular_file(filp))
                 goto out;
 
-        ret = sensor_call(pcdev, core, s_power, 1);
+        ret = pxac_sensor_set_power(pcdev, 1);
         if (ret)
                 v4l2_fh_release(filp);
 out:
@@ -2064,7 +2080,7 @@ static int pxac_fops_camera_release(struct file *filp)
         ret = _vb2_fop_release(filp, NULL);
 
         if (fh_singular)
-                ret = sensor_call(pcdev, core, s_power, 0);
+                ret = pxac_sensor_set_power(pcdev, 0);
 
         mutex_unlock(&pcdev->mlock);
 
@@ -2167,7 +2183,7 @@ static int pxa_camera_sensor_bound(struct v4l2_async_notifier *notifier,
         pix->pixelformat = pcdev->current_fmt->host_fmt->fourcc;
         v4l2_fill_mbus_format(mf, pix, pcdev->current_fmt->code);
 
-        err = sensor_call(pcdev, core, s_power, 1);
+        err = pxac_sensor_set_power(pcdev, 1);
         if (err)
                 goto out;
 
@@ -2194,7 +2210,7 @@ static int pxa_camera_sensor_bound(struct v4l2_async_notifier *notifier,
         }
 
 out_sensor_poweroff:
-        err = sensor_call(pcdev, core, s_power, 0);
+        err = pxac_sensor_set_power(pcdev, 0);
 out:
         mutex_unlock(&pcdev->mlock);
         return err;
@@ -2249,11 +2265,8 @@ static int pxa_camera_suspend(struct device *dev)
         pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR3);
         pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR4);
 
-        if (pcdev->sensor) {
-                ret = sensor_call(pcdev, core, s_power, 0);
-                if (ret == -ENOIOCTLCMD)
-                        ret = 0;
-        }
+        if (pcdev->sensor)
+                ret = pxac_sensor_set_power(pcdev, 0);
 
         return ret;
 }
@@ -2270,9 +2283,7 @@ static int pxa_camera_resume(struct device *dev)
         __raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR4);
 
         if (pcdev->sensor) {
-                ret = sensor_call(pcdev, core, s_power, 1);
-                if (ret == -ENOIOCTLCMD)
-                        ret = 0;
+                ret = pxac_sensor_set_power(pcdev, 1);
         }
 
         /* Restart frame capture if active buffer exists */