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authorKuninori Morimoto <morimoto.kuninori@renesas.com>2009-12-11 17:34:50 +0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-12-16 14:27:24 +0300
commit607e5ad8d596495341fa0a13e0a23121ee6053b6 (patch)
tree83b1d3b8dcc28c9be134aefeec14fbb4fdd32682 /drivers/media/video/tw9910.c
parent06f292e4806fcec2e7b2356c41241f5b6c4e3afb (diff)
downloadlinux-607e5ad8d596495341fa0a13e0a23121ee6053b6.tar.xz
V4L/DVB (13655): tw9910: Add power control
Power down internal blocks when not streaming. 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>
Diffstat (limited to 'drivers/media/video/tw9910.c')
-rw-r--r--drivers/media/video/tw9910.c39
1 files changed, 36 insertions, 3 deletions
diff --git a/drivers/media/video/tw9910.c b/drivers/media/video/tw9910.c
index 80b214efb24e..c21acedcf027 100644
--- a/drivers/media/video/tw9910.c
+++ b/drivers/media/video/tw9910.c
@@ -181,6 +181,14 @@
* but all register content remain unchanged.
* This bit is self-resetting.
*/
+#define ACNTL1_PDN_MASK 0x0e
+#define CLK_PDN 0x08 /* system clock power down */
+#define Y_PDN 0x04 /* Luma ADC power down */
+#define C_PDN 0x02 /* Chroma ADC power down */
+
+/* ACNTL2 */
+#define ACNTL2_PDN_MASK 0x40
+#define PLL_PDN 0x40 /* PLL power down */
/* VBICNTL */
@@ -478,10 +486,31 @@ static int tw9910_mask_set(struct i2c_client *client, u8 command,
static void tw9910_reset(struct i2c_client *client)
{
- i2c_smbus_write_byte_data(client, ACNTL1, SRESET);
+ tw9910_mask_set(client, ACNTL1, SRESET, SRESET);
msleep(1);
}
+static int tw9910_power(struct i2c_client *client, int enable)
+{
+ int ret;
+ u8 acntl1;
+ u8 acntl2;
+
+ if (enable) {
+ acntl1 = 0;
+ acntl2 = 0;
+ } else {
+ acntl1 = CLK_PDN | Y_PDN | C_PDN;
+ acntl2 = PLL_PDN;
+ }
+
+ ret = tw9910_mask_set(client, ACNTL1, ACNTL1_PDN_MASK, acntl1);
+ if (ret < 0)
+ return ret;
+
+ return tw9910_mask_set(client, ACNTL2, ACNTL2_PDN_MASK, acntl2);
+}
+
static const struct tw9910_scale_ctrl*
tw9910_select_norm(struct soc_camera_device *icd, u32 width, u32 height)
{
@@ -520,8 +549,8 @@ static int tw9910_s_stream(struct v4l2_subdev *sd, int enable)
{
struct i2c_client *client = sd->priv;
struct tw9910_priv *priv = to_tw9910(client);
-
u8 val;
+ int ret;
if (!enable) {
switch (priv->revision) {
@@ -549,7 +578,11 @@ static int tw9910_s_stream(struct v4l2_subdev *sd, int enable)
priv->scale->height);
}
- return tw9910_mask_set(client, OPFORM, OEN_TRI_SEL_MASK, val);
+ ret = tw9910_mask_set(client, OPFORM, OEN_TRI_SEL_MASK, val);
+ if (ret < 0)
+ return ret;
+
+ return tw9910_power(client, enable);
}
static int tw9910_set_bus_param(struct soc_camera_device *icd,