V4L/DVB (13654): tw9910: Tri-state pins when idle

Tri-state all pins when not streaming to save power.

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 30 insertions, 13 deletions

diff --git a/drivers/media/video/tw9910.c b/drivers/media/video/tw9910.c
index 3d8a45f0eb2a..80b214efb24e 100644
--- a/drivers/media/video/tw9910.c
+++ b/drivers/media/video/tw9910.c
@@ -152,7 +152,10 @@
                          /* 1 : non-auto */
 #define VSCTL       0x08 /* 1 : Vertical out ctrl by DVALID */
                          /* 0 : Vertical out ctrl by HACTIVE and DVALID */
-#define OEN         0x04 /* Output Enable together with TRI_SEL. */
+#define OEN_TRI_SEL_MASK        0x07
+#define OEN_TRI_SEL_ALL_ON      0x00 /* Enable output for Rev0/Rev1 */
+#define OEN_TRI_SEL_ALL_OFF_r0  0x06 /* All tri-stated for Rev0 */
+#define OEN_TRI_SEL_ALL_OFF_r1  0x07 /* All tri-stated for Rev1 */
 
 /* OUTCTR1 */
 #define VSP_LO      0x00 /* 0 : VS pin output polarity is active low */
@@ -236,7 +239,6 @@ struct tw9910_priv {
 
 static const struct regval_list tw9910_default_regs[] =
 {
-        { OPFORM,  0x00 },
         { OUTCTR1, VSP_LO | VSSL_VVALID | HSP_HI | HSSL_HSYNC },
         ENDMARKER,
 };
@@ -519,20 +521,35 @@ static int tw9910_s_stream(struct v4l2_subdev *sd, int enable)
         struct i2c_client *client = sd->priv;
         struct tw9910_priv *priv = to_tw9910(client);
 
-        if (!enable)
-                return 0;
+        u8 val;
 
-        if (!priv->scale) {
-                dev_err(&client->dev, "norm select error\n");
-                return -EPERM;
-        }
+        if (!enable) {
+                switch (priv->revision) {
+                case 0:
+                        val = OEN_TRI_SEL_ALL_OFF_r0;
+                        break;
+                case 1:
+                        val = OEN_TRI_SEL_ALL_OFF_r1;
+                        break;
+                default:
+                        dev_err(&client->dev, "un-supported revision\n");
+                        return -EINVAL;
+                }
+        } else {
+                val = OEN_TRI_SEL_ALL_ON;
 
-        dev_dbg(&client->dev, "%s %dx%d\n",
-                 priv->scale->name,
-                 priv->scale->width,
-                 priv->scale->height);
+                if (!priv->scale) {
+                        dev_err(&client->dev, "norm select error\n");
+                        return -EPERM;
+                }
 
-        return 0;
+                dev_dbg(&client->dev, "%s %dx%d\n",
+                        priv->scale->name,
+                        priv->scale->width,
+                        priv->scale->height);
+        }
+
+        return tw9910_mask_set(client, OPFORM, OEN_TRI_SEL_MASK, val);
 }
 
 static int tw9910_set_bus_param(struct soc_camera_device *icd,