[media] adv7180: Reset the device before initialization

Reset the device when initializing it so it is in a good known state and the
assumed register settings matches the actual register settings.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Federico Vaga <federico.vaga@gmail.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
index 432a756..44a2832 100644 (file)
--- a/drivers/media/i2c/adv7180.c
+++ b/drivers/media/i2c/adv7180.c
@@ -30,6 +30,7 @@
 #include <media/v4l2-device.h>
 #include <media/v4l2-ctrls.h>
 #include <linux/mutex.h>
+#include <linux/delay.h>
 
 #define ADV7180_REG_INPUT_CONTROL                      0x0000
 #define ADV7180_INPUT_CONTROL_AD_PAL_BG_NTSC_J_SECAM   0x00
@@ -523,6 +524,9 @@ static int init_device(struct adv7180_state *state)
 
        mutex_lock(&state->mutex);
 
+       adv7180_write(state, ADV7180_REG_PWR_MAN, ADV7180_PWR_MAN_RES);
+       usleep_range(2000, 10000);
+
        /* Initialize adv7180 */
        /* Enable autodetection */
        if (state->autodetect) {
@@ -692,14 +696,14 @@ static int adv7180_resume(struct device *dev)
        struct adv7180_state *state = to_state(sd);
        int ret;
 
-       if (state->powered) {
-               ret = adv7180_set_power(state, true);
-               if (ret)
-                       return ret;
-       }
        ret = init_device(state);
        if (ret < 0)
                return ret;
+
+       ret = adv7180_set_power(state, state->powered);
+       if (ret)
+               return ret;
+
        return 0;
 }