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From 9524eae5a46285e574b869879fb0228fb4424a5f Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Thu, 1 Dec 2022 13:54:49 +0000
Subject: [PATCH] media: i2c: ov7251: Add module param to select ext
trig mode
As there isn't currently a defined mechanism for selecting an
external trigger mode on image sensors, copy the imx477
approach of using a module parameter to enable ext trig.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
drivers/media/i2c/ov7251.c | 35 ++++++++++++++++++++++++++++++++---
1 file changed, 32 insertions(+), 3 deletions(-)
--- a/drivers/media/i2c/ov7251.c
+++ b/drivers/media/i2c/ov7251.c
@@ -23,6 +23,10 @@
#include <media/v4l2-fwnode.h>
#include <media/v4l2-subdev.h>
+static int trigger_mode;
+module_param(trigger_mode, int, 0644);
+MODULE_PARM_DESC(trigger_mode, "Set vsync trigger mode: 0=standalone, (1=source - not implemented), 2=sink");
+
#define OV7251_SC_MODE_SELECT 0x0100
#define OV7251_SC_MODE_SELECT_SW_STANDBY 0x0
#define OV7251_SC_MODE_SELECT_STREAMING 0x1
@@ -525,7 +529,6 @@ static const struct reg_value ov7251_set
{ 0x3662, 0x01 },
{ 0x3663, 0x70 },
{ 0x3664, 0x50 },
- { 0x3666, 0x0a },
{ 0x3669, 0x1a },
{ 0x366a, 0x00 },
{ 0x366b, 0x50 },
@@ -592,9 +595,8 @@ static const struct reg_value ov7251_set
{ 0x3c00, 0x89 },
{ 0x3c01, 0x63 },
{ 0x3c02, 0x01 },
- { 0x3c03, 0x00 },
{ 0x3c04, 0x00 },
- { 0x3c05, 0x03 },
+ { 0x3c05, 0x01 },
{ 0x3c06, 0x00 },
{ 0x3c07, 0x06 },
{ 0x3c0c, 0x01 },
@@ -624,6 +626,16 @@ static const struct reg_value ov7251_set
{ 0x5001, 0x80 },
};
+static const struct reg_value ov7251_ext_trig_on[] = {
+ { 0x3666, 0x00 },
+ { 0x3c03, 0x17 },
+};
+
+static const struct reg_value ov7251_ext_trig_off[] = {
+ { 0x3666, 0x0a },
+ { 0x3c03, 0x00 },
+};
+
static const unsigned long supported_xclk_rates[] = {
[OV7251_19_2_MHZ] = 19200000,
[OV7251_24_MHZ] = 24000000,
@@ -1372,6 +1384,23 @@ static int ov7251_s_stream(struct v4l2_s
dev_err(ov7251->dev, "could not sync v4l2 controls\n");
goto err_power_down;
}
+
+ /* Set vsync trigger mode */
+ switch (trigger_mode) {
+ case 2:
+ ov7251_set_register_array(ov7251,
+ ov7251_ext_trig_on,
+ ARRAY_SIZE(ov7251_ext_trig_on));
+ break;
+ case 0:
+ default:
+ /* case 1 for ext trig source currently not implemented */
+ ov7251_set_register_array(ov7251,
+ ov7251_ext_trig_off,
+ ARRAY_SIZE(ov7251_ext_trig_off));
+ break;
+ }
+
ret = ov7251_write_reg(ov7251, OV7251_SC_MODE_SELECT,
OV7251_SC_MODE_SELECT_STREAMING);
if (ret)
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