Hi Laurent,
On 07/17/2012 04:24 AM, Laurent Pinchart wrote:
Hi David,
Thanks for the review.
You're welcome.
On Monday 16 July 2012 02:17:43 David Cohen wrote:
On 07/05/2012 11:38 PM, Laurent Pinchart wrote:
Instead of forcing all soc-camera drivers to go through the mid-layer to
handle power management, create soc_camera_power_[on|off]() functions
that can be called from the subdev .s_power() operation to manage
regulators and platform-specific power handling. This allows non
soc-camera hosts to use soc-camera-aware clients.
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
drivers/media/video/imx074.c | 9 +++
drivers/media/video/mt9m001.c | 9 +++
drivers/media/video/mt9m111.c | 52 +++++++++++++-----
drivers/media/video/mt9t031.c | 11 +++-
drivers/media/video/mt9t112.c | 9 +++
drivers/media/video/mt9v022.c | 9 +++
drivers/media/video/ov2640.c | 9 +++
drivers/media/video/ov5642.c | 10 +++-
drivers/media/video/ov6650.c | 9 +++
drivers/media/video/ov772x.c | 9 +++
drivers/media/video/ov9640.c | 10 +++-
drivers/media/video/ov9740.c | 15 +++++-
drivers/media/video/rj54n1cb0c.c | 9 +++
drivers/media/video/soc_camera.c | 83 ++++++++++++--------
drivers/media/video/soc_camera_platform.c | 11 ++++-
drivers/media/video/tw9910.c | 9 +++
include/media/soc_camera.h | 10 ++++
17 files changed, 225 insertions(+), 58 deletions(-)
[snip]
diff --git a/drivers/media/video/ov9740.c b/drivers/media/video/ov9740.c
index 3eb07c2..effd0f1 100644
--- a/drivers/media/video/ov9740.c
+++ b/drivers/media/video/ov9740.c
@@ -786,16 +786,29 @@ static int ov9740_g_chip_ident(struct v4l2_subdev
*sd,>
static int ov9740_s_power(struct v4l2_subdev *sd, int on)
{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
struct ov9740_priv *priv = to_ov9740(sd);
+ int ret;
- if (!priv->current_enable)
+ if (on) {
+ ret = soc_camera_power_on(&client->dev, icl);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (!priv->current_enable) {
+ if (!on)
+ soc_camera_power_off(&client->dev, icl);
After your changes, this function has 3 if's (one nested) where all of
them checks "on" variable due to you need to mix "on" and
"priv->current_enable" checks. However, code's traceability is not so
trivial.
How about if you nest "priv->current_enable" into last "if" and keep
only that one?
See an incomplete code below:
return 0;
+ }
if (on) {
soc_camera_power_on();
if (!priv->current_enable)
return;
ov9740_s_fmt(sd, &priv->current_mf);
ov9740_s_stream(sd, priv->current_enable);
} else {
ov9740_s_stream(sd, 0);
Execute ov9740_s_stream() conditionally:
if (priv->current_enable) {
ov9740_s_stream();
priv->current_enable = true;
}
+ soc_camera_power_off(&client->dev, icl);
priv->current_enable = true;
priv->current_enable is set to false when ov9740_s_stream(0) is called
then this function sets it back to true afterwards. So, in case you want
to have no functional change, it seems to me you should call
soc_camera_power_off() after that variable has its original value set
back.
In this case, even if you don't like my suggestion, you still need to
swap those 2 lines above. :)
What do you think of
Sounds good to me :)
Br,
David Cohen
diff --git a/drivers/media/video/ov9740.c b/drivers/media/video/ov9740.c
index 3eb07c2..10c0ba9 100644
--- a/drivers/media/video/ov9740.c
+++ b/drivers/media/video/ov9740.c
@@ -786,17 +786,27 @@ static int ov9740_g_chip_ident(struct v4l2_subdev *sd,
static int ov9740_s_power(struct v4l2_subdev *sd, int on)
{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
struct ov9740_priv *priv = to_ov9740(sd);
-
- if (!priv->current_enable)
- return 0;
+ int ret;
if (on) {
- ov9740_s_fmt(sd, &priv->current_mf);
- ov9740_s_stream(sd, priv->current_enable);
+ ret = soc_camera_power_on(&client->dev, icl);
+ if (ret < 0)
+ return ret;
+
+ if (priv->current_enable) {
+ ov9740_s_fmt(sd, &priv->current_mf);
+ ov9740_s_stream(sd, 1);
+ }
} else {
- ov9740_s_stream(sd, 0);
- priv->current_enable = true;
+ if (priv->current_enable) {
+ ov9740_s_stream(sd, 0);
+ priv->current_enable = true;
+ }
+
+ soc_camera_power_off(&client->dev, icl);
}
return 0;
--
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