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V4L/DVB (13655): tw9910: Add power control

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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>
This commit is contained in:
Kuninori Morimoto 2009-12-11 11:34:50 -03:00 committed by Mauro Carvalho Chehab
parent 06f292e480
commit 607e5ad8d5
1 changed files with 36 additions and 3 deletions
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39
drivers/media/video/tw9910.c
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@ -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,