diff options
| author | Kuninori Morimoto <morimoto.kuninori@renesas.com> | 2009-12-11 15:34:50 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-12-16 12:27:24 +0100 |
| commit | 607e5ad8d596495341fa0a13e0a23121ee6053b6 (patch) | |
| tree | 83b1d3b8dcc28c9be134aefeec14fbb4fdd32682 /drivers/media/video/tw9910.c | |
| parent | V4L/DVB (13654): tw9910: Tri-state pins when idle (diff) | |
| download | linux-607e5ad8d596495341fa0a13e0a23121ee6053b6.tar.xz linux-607e5ad8d596495341fa0a13e0a23121ee6053b6.zip | |
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.c | 39 |
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, |