[PATCH 5/5] media: i2c: imx290: Add configurable link frequency and pixel rate

Manivannan Sadhasivam
2019-11-29T19:07:35Z

IMX290 operates with multiple link frequency and pixel rate combinations.
The initial driver used a single setting for both but since we now have
the lane count support in place, let's add configurable link frequency
and pixel rate.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
drivers/media/i2c/imx290.c | 155 +++++++++++++++++++++----------------
1 file changed, 89 insertions(+), 66 deletions(-)

diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
index f26c4a0ee0a0..d794ade26609 100644
--- a/drivers/media/i2c/imx290.c
+++ b/drivers/media/i2c/imx290.c
@@ -45,8 +45,6 @@
#define IMX290_HMAX_2_720 0x19C8
#define IMX290_HMAX_4_720 0x0CE4

-#define IMX290_DEFAULT_LINK_FREQ 445500000
-
static const char * const imx290_supply_name[] = {
"vdda",
"vddd",
@@ -63,8 +61,6 @@ struct imx290_regval {
struct imx290_mode {
u32 width;
u32 height;
- u32 pixel_rate;
- u32 link_freq_index;

const struct imx290_regval *data;
u32 data_size;
@@ -281,7 +277,10 @@ static const struct imx290_regval imx290_12bit_settings[] = {

/* supported link frequencies */
static const s64 imx290_link_freq[] = {
- IMX290_DEFAULT_LINK_FREQ,
+ 891000000, /* 1920x1080 - 2 lane */
+ 445500000, /* 1920x1080 - 4 lane */
+ 594000000, /* 1280x720 - 2 lane */
+ 297000000, /* 1280x720 - 4 lane */
};

/* Mode configs */
@@ -291,16 +290,12 @@ static const struct imx290_mode imx290_modes[] = {
.height = 1080,
.data = imx290_1080p_settings,
.data_size = ARRAY_SIZE(imx290_1080p_settings),
- .pixel_rate = 178200000,
- .link_freq_index = 0,
},
{
.width = 1280,
.height = 720,
.data = imx290_720p_settings,
.data_size = ARRAY_SIZE(imx290_720p_settings),
- .pixel_rate = 178200000,
- .link_freq_index = 0,
},
};

@@ -509,6 +504,73 @@ static int imx290_get_fmt(struct v4l2_subdev *sd,
return 0;
}

+static s64 imx290_get_link_freq_index(struct imx290 *imx290)
+{
+ const struct imx290_mode *cur_mode = imx290->current_mode;
+ u8 index;
+
+ if (cur_mode->width == 1920)
+ index = imx290->nlanes / 4;
+ else
+ index = (imx290->nlanes / 4) + 2;
+
+ return index;
+}
+
+static s64 imx290_get_link_freq(struct imx290 *imx290)
+{
+ u8 index = imx290_get_link_freq_index(imx290);
+
+ return imx290_link_freq[index];
+}
+
+static u64 imx290_calc_pixel_rate(struct imx290 *imx290)
+{
+ s64 link_freq = imx290_get_link_freq(imx290);
+ u8 nlanes = imx290->nlanes;
+
+ /* pixel rate = link_freq * 2 * nr_of_lanes / bits_per_sample */
+ return (link_freq * 2 * nlanes / imx290->bpp);
+}
+
+static int imx290_write_current_format(struct imx290 *imx290,
+ struct v4l2_mbus_framefmt *format)
+{
+ int ret;
+
+ switch (format->code) {
+ case MEDIA_BUS_FMT_SRGGB10_1X10:
+ ret = imx290_set_register_array(imx290, imx290_10bit_settings,
+ ARRAY_SIZE(
+ imx290_10bit_settings));
+ if (ret < 0) {
+ dev_err(imx290->dev, "Could not set format registers\n");
+ return ret;
+ }
+
+ imx290->bpp = 10;
+
+ break;
+ case MEDIA_BUS_FMT_SRGGB12_1X12:
+ ret = imx290_set_register_array(imx290, imx290_12bit_settings,
+ ARRAY_SIZE(
+ imx290_12bit_settings));
+ if (ret < 0) {
+ dev_err(imx290->dev, "Could not set format registers\n");
+ return ret;
+ }
+
+ imx290->bpp = 12;
+
+ break;
+ default:
+ dev_err(imx290->dev, "Unknown pixel format\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int imx290_set_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *fmt)
@@ -517,6 +579,7 @@ static int imx290_set_fmt(struct v4l2_subdev *sd,
const struct imx290_mode *mode;
struct v4l2_mbus_framefmt *format;
unsigned int i;
+ int ret = 0;

mutex_lock(&imx290->lock);

@@ -542,17 +605,27 @@ static int imx290_set_fmt(struct v4l2_subdev *sd,
format = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
} else {
format = &imx290->current_format;
- __v4l2_ctrl_s_ctrl(imx290->link_freq, mode->link_freq_index);
- __v4l2_ctrl_s_ctrl_int64(imx290->pixel_rate, mode->pixel_rate);
-
imx290->current_mode = mode;
+
+ /* Set current frame format */
+ ret = imx290_write_current_format(imx290, &fmt->format);
+ if (ret < 0) {
+ dev_err(imx290->dev, "Could not set frame format\n");
+ goto err_out;
+ }
+
+ __v4l2_ctrl_s_ctrl(imx290->link_freq,
+ imx290_get_link_freq_index(imx290));
+ __v4l2_ctrl_s_ctrl_int64(imx290->pixel_rate,
+ imx290_calc_pixel_rate(imx290));
}

*format = fmt->format;

+err_out:
mutex_unlock(&imx290->lock);

- return 0;
+ return ret;
}

static int imx290_entity_init_cfg(struct v4l2_subdev *subdev,
@@ -569,44 +642,6 @@ static int imx290_entity_init_cfg(struct v4l2_subdev *subdev,
return 0;
}

-static int imx290_write_current_format(struct imx290 *imx290,
- struct v4l2_mbus_framefmt *format)
-{
- int ret;
-
- switch (format->code) {
- case MEDIA_BUS_FMT_SRGGB10_1X10:
- ret = imx290_set_register_array(imx290, imx290_10bit_settings,
- ARRAY_SIZE(
- imx290_10bit_settings));
- if (ret < 0) {
- dev_err(imx290->dev, "Could not set format registers\n");
- return ret;
- }
-
- imx290->bpp = 10;
-
- break;
- case MEDIA_BUS_FMT_SRGGB12_1X12:
- ret = imx290_set_register_array(imx290, imx290_12bit_settings,
- ARRAY_SIZE(
- imx290_12bit_settings));
- if (ret < 0) {
- dev_err(imx290->dev, "Could not set format registers\n");
- return ret;
- }
-
- imx290->bpp = 12;
-
- break;
- default:
- dev_err(imx290->dev, "Unknown pixel format\n");
- return -EINVAL;
- }
-
- return 0;
-}
-
static int imx290_set_hmax(struct imx290 *imx290, u32 val)
{
int ret;
@@ -640,13 +675,6 @@ static int imx290_start_streaming(struct imx290 *imx290)
return ret;
}

- /* Set current frame format */
- ret = imx290_write_current_format(imx290, &imx290->current_format);
- if (ret < 0) {
- dev_err(imx290->dev, "Could not set frame format\n");
- return ret;
- }
-
/* Apply default values of current mode */
ret = imx290_set_register_array(imx290, imx290->current_mode->data,
imx290->current_mode->data_size);
@@ -901,12 +929,6 @@ static int imx290_probe(struct i2c_client *client)
goto free_err;
}

- if (imx290->ep.link_frequencies[0] != IMX290_DEFAULT_LINK_FREQ) {
- dev_err(dev, "Unsupported link frequency\n");
- ret = -EINVAL;
- goto free_err;
- }
-
/* Only CSI2 is supported for now */
if (imx290->ep.bus_type != V4L2_MBUS_CSI2_DPHY) {
dev_err(dev, "Unsupported bus type, should be CSI2\n");
@@ -973,14 +995,15 @@ static int imx290_probe(struct i2c_client *client)
&imx290_ctrl_ops,
V4L2_CID_LINK_FREQ,
ARRAY_SIZE(imx290_link_freq) - 1,
- 0, imx290_link_freq);
+ (imx290->nlanes / 4),
+ imx290_link_freq);
if (imx290->link_freq)
imx290->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;

imx290->pixel_rate = v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
V4L2_CID_PIXEL_RATE, 1,
INT_MAX, 1,
- imx290_modes[0].pixel_rate);
+ imx290_calc_pixel_rate(imx290));

v4l2_ctrl_new_std_menu_items(&imx290->ctrls, &imx290_ctrl_ops,
V4L2_CID_TEST_PATTERN,
--
2.17.1