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media: i2c: ov9282: Add selection for CSI2 clock mode

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The sensor supports either having the CSI2 clock lane free
running, or gated when there is no packet to transmit.
The driver only selected gated (non-continuous) clock mode.

Add code to allow fwnode to configure whether the clock is
gated or free running.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Dave Stevenson 2022-10-28 17:08:54 +01:00 committed by Mauro Carvalho Chehab
parent 9fd61bb0e3
commit 6f7def3d8a
1 changed files with 22 additions and 2 deletions
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24
drivers/media/i2c/ov9282.c
View file

@ -45,6 +45,9 @@
/* Group hold register */
#define OV9282_REG_HOLD 0x3308
#define OV9282_REG_MIPI_CTRL00 0x4800
#define OV9282_GATED_CLOCK BIT(5)
/* Input clock rate */
#define OV9282_INCLK_RATE 24000000
@ -136,6 +139,7 @@ struct ov9282 {
struct v4l2_ctrl *again_ctrl;
};
u32 vblank;
bool noncontinuous_clock;
const struct ov9282_mode *cur_mode;
struct mutex mutex;
bool streaming;
@ -145,7 +149,13 @@ static const s64 link_freq[] = {
OV9282_LINK_FREQ,
};
/* Common registers */
/*
* Common registers
*
* Note: Do NOT include a software reset (0x0103, 0x01) in any of these
* register arrays as some settings are written as part of ov9282_power_on,
* and the reset will clear them.
*/
static const struct ov9282_reg common_regs[] = {
{0x0302, 0x32},
{0x030d, 0x50},
@ -201,7 +211,6 @@ static const struct ov9282_reg common_regs[] = {
{0x4601, 0x04},
{0x470f, 0x00},
{0x4f07, 0x00},
{0x4800, 0x20},
{0x5000, 0x9f},
{0x5001, 0x00},
{0x5e00, 0x00},
@ -835,6 +844,9 @@ static int ov9282_parse_hw_config(struct ov9282 *ov9282)
if (ret)
return ret;
ov9282->noncontinuous_clock =
bus_cfg.bus.mipi_csi2.flags & V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
if (bus_cfg.bus.mipi_csi2.num_data_lanes != OV9282_NUM_DATA_LANES) {
dev_err(ov9282->dev,
"number of CSI2 data lanes %d is not supported",
@ -903,6 +915,14 @@ static int ov9282_power_on(struct device *dev)
usleep_range(400, 600);
ret = ov9282_write_reg(ov9282, OV9282_REG_MIPI_CTRL00, 1,
ov9282->noncontinuous_clock ?
OV9282_GATED_CLOCK : 0);
if (ret) {
dev_err(ov9282->dev, "fail to write MIPI_CTRL00");
return ret;
}
return 0;
error_reset: