[PATCH] media: pxa_camera: ignore -ENOIOCTLCMD from v4l2_subdev_call for s_power

[Akinobu Mita]

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: Hans Verkuil <hans.verk...@cisco.com>
Cc: Sakari Ailus <sakari.ai...@linux.intel.com>
Cc: Mauro Carvalho Chehab <mche...@kernel.org>
Signed-off-by: Akinobu Mita <akinobu.m...@gmail.com>
---
 drivers/media/platform/pxa_camera.c | 35 +++++++++++++++++++++++------------
 1 file changed, 23 insertions(+), 12 deletions(-)

diff --git a/drivers/media/platform/pxa_camera.c 
b/drivers/media/platform/pxa_camera.c
index c792cb1..4d5a26b 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 */
-- 
2.7.4