[PATCH 20/21] media: i2c: imx258: Change register settings for variants of the sensor

[Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>]

Sony have advised that there are variants of the IMX258 sensor which
require slightly different register configuration to the mainline
imx258 driver defaults.

There is no available run-time detection for the variant, so add
configuration via the DT compatible string.

The Vision Components imx258 module supports PDAF, so add the
register differences for that variant

Signed-off-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
---
 drivers/media/i2c/imx258.c | 49 ++++++++++++++++++++++++++++++++++----
 1 file changed, 45 insertions(+), 4 deletions(-)

diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
index 986757650378..98b5c1e3abff 100644
--- a/drivers/media/i2c/imx258.c
+++ b/drivers/media/i2c/imx258.c
@@ -6,6 +6,7 @@
 #include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 #include <media/v4l2-ctrls.h>
@@ -320,8 +321,6 @@ static const struct imx258_reg mipi_642mbps_24mhz_4l[] = {
 
 static const struct imx258_reg mode_common_regs[] = {
 	{ 0x3051, 0x00 },
-	{ 0x3052, 0x00 },
-	{ 0x4E21, 0x14 },
 	{ 0x6B11, 0xCF },
 	{ 0x7FF0, 0x08 },
 	{ 0x7FF1, 0x0F },
@@ -344,7 +343,6 @@ static const struct imx258_reg mode_common_regs[] = {
 	{ 0x7FA8, 0x03 },
 	{ 0x7FA9, 0xFE },
 	{ 0x7B24, 0x81 },
-	{ 0x7B25, 0x00 },
 	{ 0x6564, 0x07 },
 	{ 0x6B0D, 0x41 },
 	{ 0x653D, 0x04 },
@@ -459,6 +457,33 @@ static const struct imx258_reg mode_1048_780_regs[] = {
 	{ 0x034F, 0x0C },
 };
 
+struct imx258_variant_cfg {
+	const struct imx258_reg *regs;
+	unsigned int num_regs;
+};
+
+static const struct imx258_reg imx258_cfg_regs[] = {
+	{ 0x3052, 0x00 },
+	{ 0x4E21, 0x14 },
+	{ 0x7B25, 0x00 },
+};
+
+static const struct imx258_variant_cfg imx258_cfg = {
+	.regs = imx258_cfg_regs,
+	.num_regs = ARRAY_SIZE(imx258_cfg_regs),
+};
+
+static const struct imx258_reg imx258_pdaf_cfg_regs[] = {
+	{ 0x3052, 0x01 },
+	{ 0x4E21, 0x10 },
+	{ 0x7B25, 0x01 },
+};
+
+static const struct imx258_variant_cfg imx258_pdaf_cfg = {
+	.regs = imx258_pdaf_cfg_regs,
+	.num_regs = ARRAY_SIZE(imx258_pdaf_cfg_regs),
+};
+
 static const char * const imx258_test_pattern_menu[] = {
 	"Disabled",
 	"Solid Colour",
@@ -643,6 +668,8 @@ struct imx258 {
 	struct v4l2_subdev sd;
 	struct media_pad pad;
 
+	const struct imx258_variant_cfg *variant_cfg;
+
 	struct v4l2_ctrl_handler ctrl_handler;
 	/* V4L2 Controls */
 	struct v4l2_ctrl *link_freq;
@@ -1134,6 +1161,14 @@ static int imx258_start_streaming(struct imx258 *imx258)
 		return ret;
 	}
 
+	ret = imx258_write_regs(imx258, imx258->variant_cfg->regs,
+				imx258->variant_cfg->num_regs);
+	if (ret) {
+		dev_err(&client->dev, "%s failed to set variant config\n",
+			__func__);
+		return ret;
+	}
+
 	ret = imx258_write_reg(imx258, IMX258_CLK_BLANK_STOP,
 			       IMX258_REG_VALUE_08BIT,
 			       imx258->csi2_flags & V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK ?
@@ -1490,6 +1525,7 @@ static int imx258_probe(struct i2c_client *client)
 	struct v4l2_fwnode_endpoint ep = {
 		.bus_type = V4L2_MBUS_CSI2_DPHY
 	};
+	const struct of_device_id *match;
 	int ret;
 	u32 val = 0;
 
@@ -1565,6 +1601,10 @@ static int imx258_probe(struct i2c_client *client)
 
 	imx258->csi2_flags = ep.bus.mipi_csi2.flags;
 
+	imx258->variant_cfg = of_device_get_match_data(&client->dev);
+	if (!match)
+		imx258->variant_cfg = &imx258_cfg;
+
 	/* Initialize subdev */
 	v4l2_i2c_subdev_init(&imx258->sd, client, &imx258_subdev_ops);
 
@@ -1653,7 +1693,8 @@ MODULE_DEVICE_TABLE(acpi, imx258_acpi_ids);
 #endif
 
 static const struct of_device_id imx258_dt_ids[] = {
-	{ .compatible = "sony,imx258" },
+	{ .compatible = "sony,imx258", .data = &imx258_cfg },
+	{ .compatible = "sony,imx258-pdaf", .data = &imx258_pdaf_cfg },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, imx258_dt_ids);
-- 
2.25.1