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Subject[PATCH v2 1/6] media: i2c: imx290: Add support for 2 data lanes
Date
The IMX290 sensor can output frames with 2/4 CSI2 data lanes. This commit
adds support for 2 lane mode in addition to the 4 lane and also
configuring the data lane settings in the driver based on system
configuration.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
drivers/media/i2c/imx290.c | 133 ++++++++++++++++++++++++++++++++++---
1 file changed, 124 insertions(+), 9 deletions(-)

diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
index f7678e5a5d87..532ad488b801 100644
--- a/drivers/media/i2c/imx290.c
+++ b/drivers/media/i2c/imx290.c
@@ -25,7 +25,18 @@
#define IMX290_STANDBY 0x3000
#define IMX290_REGHOLD 0x3001
#define IMX290_XMSTA 0x3002
+#define IMX290_FR_FDG_SEL 0x3009
#define IMX290_GAIN 0x3014
+#define IMX290_HMAX_LOW 0x301c
+#define IMX290_HMAX_HIGH 0x301d
+#define IMX290_PHY_LANE_NUM 0x3407
+#define IMX290_CSI_LANE_MODE 0x3443
+
+/* HMAX fields */
+#define IMX290_HMAX_2_1920 0x1130
+#define IMX290_HMAX_4_1920 0x0898
+#define IMX290_HMAX_2_720 0x19C8
+#define IMX290_HMAX_4_720 0x0CE4

#define IMX290_DEFAULT_LINK_FREQ 445500000

@@ -56,6 +67,7 @@ struct imx290 {
struct device *dev;
struct clk *xclk;
struct regmap *regmap;
+ u8 nlanes;

struct v4l2_subdev sd;
struct v4l2_fwnode_endpoint ep;
@@ -89,14 +101,11 @@ static const struct regmap_config imx290_regmap_config = {

static const struct imx290_regval imx290_global_init_settings[] = {
{ 0x3007, 0x00 },
- { 0x3009, 0x00 },
{ 0x3018, 0x65 },
{ 0x3019, 0x04 },
{ 0x301a, 0x00 },
- { 0x3443, 0x03 },
{ 0x3444, 0x20 },
{ 0x3445, 0x25 },
- { 0x3407, 0x03 },
{ 0x303a, 0x0c },
{ 0x3040, 0x00 },
{ 0x3041, 0x00 },
@@ -169,7 +178,6 @@ static const struct imx290_regval imx290_1080p_settings[] = {
{ 0x3164, 0x1a },
{ 0x3480, 0x49 },
/* data rate settings */
- { 0x3009, 0x01 },
{ 0x3405, 0x10 },
{ 0x3446, 0x57 },
{ 0x3447, 0x00 },
@@ -187,8 +195,6 @@ static const struct imx290_regval imx290_1080p_settings[] = {
{ 0x3453, 0x00 },
{ 0x3454, 0x17 },
{ 0x3455, 0x00 },
- { 0x301c, 0x98 },
- { 0x301d, 0x08 },
};

static const struct imx290_regval imx290_720p_settings[] = {
@@ -210,7 +216,6 @@ static const struct imx290_regval imx290_720p_settings[] = {
{ 0x3164, 0x1a },
{ 0x3480, 0x49 },
/* data rate settings */
- { 0x3009, 0x01 },
{ 0x3405, 0x10 },
{ 0x3446, 0x4f },
{ 0x3447, 0x00 },
@@ -228,8 +233,6 @@ static const struct imx290_regval imx290_720p_settings[] = {
{ 0x3453, 0x00 },
{ 0x3454, 0x17 },
{ 0x3455, 0x00 },
- { 0x301c, 0xe4 },
- { 0x301d, 0x0c },
};

static const struct imx290_regval imx290_10bit_settings[] = {
@@ -522,6 +525,25 @@ static int imx290_write_current_format(struct imx290 *imx290,
return 0;
}

+static int imx290_set_hmax(struct imx290 *imx290, u32 val)
+{
+ int ret;
+
+ ret = imx290_write_reg(imx290, IMX290_HMAX_LOW, (val & 0xff));
+ if (ret) {
+ dev_err(imx290->dev, "Error setting HMAX register\n");
+ return ret;
+ }
+
+ ret = imx290_write_reg(imx290, IMX290_HMAX_HIGH, ((val >> 8) & 0xff));
+ if (ret) {
+ dev_err(imx290->dev, "Error setting HMAX register\n");
+ return ret;
+ }
+
+ return 0;
+}
+
/* Start streaming */
static int imx290_start_streaming(struct imx290 *imx290)
{
@@ -551,6 +573,40 @@ static int imx290_start_streaming(struct imx290 *imx290)
return ret;
}

+ switch (imx290->nlanes) {
+ case 2:
+ if (imx290->current_mode->width == 1920) {
+ ret = imx290_set_hmax(imx290, IMX290_HMAX_2_1920);
+ if (ret < 0)
+ return ret;
+ } else {
+ ret = imx290_set_hmax(imx290, IMX290_HMAX_2_720);
+ if (ret < 0)
+ return ret;
+ }
+
+ break;
+ case 4:
+ if (imx290->current_mode->width == 1920) {
+ ret = imx290_set_hmax(imx290, IMX290_HMAX_4_1920);
+ if (ret < 0)
+ return ret;
+ } else {
+ ret = imx290_set_hmax(imx290, IMX290_HMAX_4_720);
+ if (ret < 0)
+ return ret;
+ }
+
+ break;
+ default:
+ /*
+ * We should never hit this since the data lane count is
+ * validated in probe itself
+ */
+ dev_err(imx290->dev, "Lane configuration not supported\n");
+ return -EINVAL;
+ }
+
/* Apply customized values from user */
ret = v4l2_ctrl_handler_setup(imx290->sd.ctrl_handler);
if (ret) {
@@ -607,6 +663,49 @@ static int imx290_get_regulators(struct device *dev, struct imx290 *imx290)
imx290->supplies);
}

+static int imx290_set_data_lanes(struct imx290 *imx290)
+{
+ int ret = 0, laneval, frsel;
+
+ switch (imx290->nlanes) {
+ case 2:
+ laneval = 0x01;
+ frsel = 0x02;
+ break;
+ case 4:
+ laneval = 0x03;
+ frsel = 0x01;
+ break;
+ default:
+ /*
+ * We should never hit this since the data lane count is
+ * validated in probe itself
+ */
+ dev_err(imx290->dev, "Lane configuration not supported\n");
+ ret = -EINVAL;
+ goto exit;
+ }
+
+ ret = imx290_write_reg(imx290, IMX290_PHY_LANE_NUM, laneval);
+ if (ret) {
+ dev_err(imx290->dev, "Error setting Physical Lane number register\n");
+ goto exit;
+ }
+
+ ret = imx290_write_reg(imx290, IMX290_CSI_LANE_MODE, laneval);
+ if (ret) {
+ dev_err(imx290->dev, "Error setting CSI Lane mode register\n");
+ goto exit;
+ }
+
+ ret = imx290_write_reg(imx290, IMX290_FR_FDG_SEL, frsel);
+ if (ret)
+ dev_err(imx290->dev, "Error setting FR/FDG SEL register\n");
+
+exit:
+ return ret;
+}
+
static int imx290_power_on(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
@@ -631,6 +730,9 @@ static int imx290_power_on(struct device *dev)
gpiod_set_value_cansleep(imx290->rst_gpio, 1);
usleep_range(30000, 31000);

+ /* Set data lane count */
+ imx290_set_data_lanes(imx290);
+
return 0;
}

@@ -703,6 +805,16 @@ static int imx290_probe(struct i2c_client *client)
goto free_err;
}

+ /* Get number of data lanes */
+ imx290->nlanes = imx290->ep.bus.mipi_csi2.num_data_lanes;
+ if (imx290->nlanes != 2 && imx290->nlanes != 4) {
+ dev_err(dev, "Invalid data lanes: %d\n", imx290->nlanes);
+ ret = -EINVAL;
+ goto free_err;
+ }
+
+ dev_dbg(dev, "Using %u data lanes\n", imx290->nlanes);
+
if (!imx290->ep.nr_of_link_frequencies) {
dev_err(dev, "link-frequency property not found in DT\n");
ret = -EINVAL;
@@ -822,6 +934,9 @@ static int imx290_probe(struct i2c_client *client)
goto free_entity;
}

+ /* Set data lane count */
+ imx290_set_data_lanes(imx290);
+
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
pm_runtime_idle(dev);
--
2.17.1
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