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
