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Subject[PATCH v4 4/5] media: ov7670: split register setting from set_fmt() logic
Date
This will allow us to restore the last set format after the device returns
from a power off.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
---
drivers/media/i2c/ov7670.c | 80 ++++++++++++++++++++++----------------
1 file changed, 46 insertions(+), 34 deletions(-)

diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c
index 93c055502bb9..d0f40d5f6ca0 100644
--- a/drivers/media/i2c/ov7670.c
+++ b/drivers/media/i2c/ov7670.c
@@ -241,6 +241,7 @@ struct ov7670_info {
};
struct v4l2_mbus_framefmt format;
struct ov7670_format_struct *fmt; /* Current format */
+ struct ov7670_win_size *wsize;
struct clk *clk;
int on;
struct gpio_desc *resetb_gpio;
@@ -1001,48 +1002,20 @@ static int ov7670_try_fmt_internal(struct v4l2_subdev *sd,
return 0;
}

-/*
- * Set a format.
- */
-static int ov7670_set_fmt(struct v4l2_subdev *sd,
- struct v4l2_subdev_pad_config *cfg,
- struct v4l2_subdev_format *format)
+static int ov7670_apply_fmt(struct v4l2_subdev *sd)
{
- struct ov7670_format_struct *ovfmt;
- struct ov7670_win_size *wsize;
struct ov7670_info *info = to_state(sd);
-#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
- struct v4l2_mbus_framefmt *mbus_fmt;
-#endif
+ struct ov7670_win_size *wsize = info->wsize;
unsigned char com7, com10 = 0;
int ret;

- if (format->pad)
- return -EINVAL;
-
- if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
- ret = ov7670_try_fmt_internal(sd, &format->format, NULL, NULL);
- if (ret)
- return ret;
-#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
- mbus_fmt = v4l2_subdev_get_try_format(sd, cfg, format->pad);
- *mbus_fmt = format->format;
- return 0;
-#else
- return -ENOTTY;
-#endif
- }
-
- ret = ov7670_try_fmt_internal(sd, &format->format, &ovfmt, &wsize);
- if (ret)
- return ret;
/*
* COM7 is a pain in the ass, it doesn't like to be read then
* quickly written afterward. But we have everything we need
* to set it absolutely here, as long as the format-specific
* register sets list it first.
*/
- com7 = ovfmt->regs[0].value;
+ com7 = info->fmt->regs[0].value;
com7 |= wsize->com7_bit;
ret = ov7670_write(sd, REG_COM7, com7);
if (ret)
@@ -1064,7 +1037,7 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
/*
* Now write the rest of the array. Also store start/stops
*/
- ret = ov7670_write_array(sd, ovfmt->regs + 1);
+ ret = ov7670_write_array(sd, info->fmt->regs + 1);
if (ret)
return ret;

@@ -1079,8 +1052,6 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
return ret;
}

- info->fmt = ovfmt;
-
/*
* If we're running RGB565, we must rewrite clkrc after setting
* the other parameters or the image looks poor. If we're *not*
@@ -1098,6 +1069,46 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
return 0;
}

+/*
+ * Set a format.
+ */
+static int ov7670_set_fmt(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *format)
+{
+ struct ov7670_info *info = to_state(sd);
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+ struct v4l2_mbus_framefmt *mbus_fmt;
+#endif
+ int ret;
+
+ if (format->pad)
+ return -EINVAL;
+
+ if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
+ ret = ov7670_try_fmt_internal(sd, &format->format, NULL, NULL);
+ if (ret)
+ return ret;
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+ mbus_fmt = v4l2_subdev_get_try_format(sd, cfg, format->pad);
+ *mbus_fmt = format->format;
+ return 0;
+#else
+ return -ENOTTY;
+#endif
+ }
+
+ ret = ov7670_try_fmt_internal(sd, &format->format, &info->fmt, &info->wsize);
+ if (ret)
+ return ret;
+
+ ret = ov7670_apply_fmt(sd);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
static int ov7670_get_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *format)
@@ -1882,6 +1893,7 @@ static int ov7670_probe(struct i2c_client *client,

info->devtype = &ov7670_devdata[id->driver_data];
info->fmt = &ov7670_formats[0];
+ info->wsize = &info->devtype->win_sizes[0];

ov7670_get_default_format(sd, &info->format);

--
2.20.1
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