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media: ov5647: Add support for non-continuous clock mode

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Add support for optional non-continuous clock mode to the ov5647
sensor driver.

Non-continuous clock saves a small amount of power and on some SoCs
is easier to interface with.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
Signed-off-by: Roman Kovalivskyi <roman.kovalivskyi@globallogic.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Dave Stevenson 2020-11-19 17:19:29 +01:00 • committed by Mauro Carvalho Chehab
parent b050791d28
commit dea4fcfe77
1 changed files with 20 additions and 4 deletions
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24
drivers/media/i2c/ov5647.c
View file

@ -44,6 +44,7 @@
#define PWDN_ACTIVE_DELAY_MS 20
#define MIPI_CTRL00_CLOCK_LANE_GATE BIT(5)
#define MIPI_CTRL00_LINE_SYNC_ENABLE BIT(4)
#define MIPI_CTRL00_BUS_IDLE BIT(2)
#define MIPI_CTRL00_CLOCK_LANE_DISABLE BIT(0)
@ -95,6 +96,7 @@ struct ov5647 {
int power_count;
struct clk *xclk;
struct gpio_desc *pwdn;
bool clock_ncont;
};
static inline struct ov5647 *to_state(struct v4l2_subdev *sd)
@ -269,9 +271,15 @@ static int ov5647_set_virtual_channel(struct v4l2_subdev *sd, int channel)
static int ov5647_stream_on(struct v4l2_subdev *sd)
{
struct ov5647 *ov5647 = to_state(sd);
u8 val = MIPI_CTRL00_BUS_IDLE;
int ret;
ret = ov5647_write(sd, OV5647_REG_MIPI_CTRL00, MIPI_CTRL00_BUS_IDLE);
if (ov5647->clock_ncont)
val |= MIPI_CTRL00_CLOCK_LANE_GATE |
MIPI_CTRL00_LINE_SYNC_ENABLE;
ret = ov5647_write(sd, OV5647_REG_MIPI_CTRL00, val);
if (ret < 0)
return ret;
@ -546,9 +554,11 @@ static const struct v4l2_subdev_internal_ops ov5647_subdev_internal_ops = {
.open = ov5647_open,
};
static int ov5647_parse_dt(struct device_node *np)
static int ov5647_parse_dt(struct ov5647 *sensor, struct device_node *np)
{
struct v4l2_fwnode_endpoint bus_cfg = { .bus_type = 0 };
struct v4l2_fwnode_endpoint bus_cfg = {
.bus_type = V4L2_MBUS_CSI2_DPHY,
};
struct device_node *ep;
int ret;
@ -558,7 +568,13 @@ static int ov5647_parse_dt(struct device_node *np)
return -EINVAL;
ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &bus_cfg);
if (ret)
goto out;
sensor->clock_ncont = bus_cfg.bus.mipi_csi2.flags &
V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
out:
of_node_put(ep);
return ret;
}
@ -577,7 +593,7 @@ static int ov5647_probe(struct i2c_client *client)
return -ENOMEM;
if (IS_ENABLED(CONFIG_OF) && np) {
ret = ov5647_parse_dt(np);
ret = ov5647_parse_dt(sensor, np);
if (ret) {
dev_err(dev, "DT parsing error: %d\n", ret);
return ret;