Commit 607e5ad8 authored by Kuninori Morimoto's avatar Kuninori Morimoto Committed by Mauro Carvalho Chehab
Browse files

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



Power down internal blocks when not streaming.

Signed-off-by: default avatarKuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 06f292e4

drivers/media/video/tw9910.c

+36 −3
Original line number Diff line number Diff line
@@ -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,