[PATCH v2] media: ov08x40: Add Signal Integration Adjustments for specific project

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From: Jason Chen <jason.z.chen@xxxxxxxxx>

Due to certain MIPI hardware designs using overly long cables, there
is a loss of signal strength, resulting in failed signal integration.
The patch includes changes to adjust the driving strength in the register
settings for a specific project.

Signed-off-by: Jason Chen <jason.z.chen@xxxxxxxxx>
---
 drivers/media/i2c/ov08x40.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/media/i2c/ov08x40.c b/drivers/media/i2c/ov08x40.c
index 520ccd4aecf..ddcb4b6848b 100644
--- a/drivers/media/i2c/ov08x40.c
+++ b/drivers/media/i2c/ov08x40.c
@@ -160,6 +160,18 @@ static const struct ov08x40_reg mipi_data_rate_800mbps[] = {
 	{0x6002, 0x2e},
 };
 
+static const struct ov08x40_reg mipi_si_changed_regs[] = {
+	{0x481b, 0x2c}, /* HS Exit: Data Tx TEOT - reducing 8ns */
+	{0x4826, 0x42}, /* HS Entry: Data Tx TREOT - raising 8ns */
+	{0x4829, 0x54}, /* HS Exit: Data Tx TREOT - reducing 8ns */
+	{0x4885, 0x1f}, /* driving strength change */
+};
+
+struct ov08x40_reg_list si_regs = {
+	.regs = mipi_si_changed_regs,
+	.num_of_regs = ARRAY_SIZE(mipi_si_changed_regs),
+};
+
 static const struct ov08x40_reg mode_3856x2416_regs[] = {
 	{0x5000, 0x5d},
 	{0x5001, 0x20},
@@ -2913,6 +2925,9 @@ static int ov08x40_start_streaming(struct ov08x40 *ov08x)
 		return ret;
 	}
 
+	/* Apply SI change to current project */
+	ov08x40_write_reg_list(ov08x, &si_regs);
+
 	/* Apply default values of current mode */
 	reg_list = &ov08x->cur_mode->reg_list;
 	ret = ov08x40_write_reg_list(ov08x, reg_list);
-- 
2.34.1





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