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From 78f7140c81532ad42eb3a167d7b4f83eee13701e Mon Sep 17 00:00:00 2001
From: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Date: Fri, 2 Aug 2019 21:20:00 +0300
Subject: [PATCH] media: i2c: gw5200: detection workaround
This adds detection of GW5200 workaround:
ISP starts for more then 1 second. Force detect gw5200
if enabled in dts/cmdline and the serizlier presents
---
drivers/media/i2c/soc_camera/gw5200_imx390.c | 39 +++++++++++++++++++++++++---
1 file changed, 35 insertions(+), 4 deletions(-)
diff --git a/drivers/media/i2c/soc_camera/gw5200_imx390.c b/drivers/media/i2c/soc_camera/gw5200_imx390.c
index 90de41f..98352a9 100644
--- a/drivers/media/i2c/soc_camera/gw5200_imx390.c
+++ b/drivers/media/i2c/soc_camera/gw5200_imx390.c
@@ -22,10 +22,10 @@
#include "gw5200_imx390.h"
-static const int gw5200_i2c_addr[] = {0x18};
+static const int gw5200_i2c_addr[] = {0x6d};
#define GW5200_PID 0x00
-#define GW5200_VERSION_REG 0x30
+#define GW5200_VERSION_REG 0x00
#define GW5200_MEDIA_BUS_FMT MEDIA_BUS_FMT_YUYV8_2X8
@@ -41,6 +41,7 @@ struct gw5200_priv {
int exposure;
int gain;
int autogain;
+ int gw5200;
/* serializers */
int max9286_addr;
int max9271_addr;
@@ -51,6 +52,10 @@ struct gw5200_priv {
int gpio_fsin;
};
+static int gw5200 = 0;
+module_param(gw5200, int, 0644);
+MODULE_PARM_DESC(gw5200, " gw5200 force (0 - imager disabled)");
+
static inline struct gw5200_priv *to_gw5200(const struct i2c_client *client)
{
return container_of(i2c_get_clientdata(client), struct gw5200_priv, sd);
@@ -337,9 +342,10 @@ static DEVICE_ATTR(otp_id_gw5200, S_IRUGO, gw5200_otp_id_show, NULL);
static int gw5200_initialize(struct i2c_client *client)
{
struct gw5200_priv *priv = to_gw5200(client);
- u8 pid = 0;
+ u8 pid = 0xff;
int ret = 0;
int tmp_addr;
+#if 0
int i;
for (i = 0; i < ARRAY_SIZE(gw5200_i2c_addr); i++) {
@@ -357,7 +363,7 @@ static int gw5200_initialize(struct i2c_client *client)
client->addr = tmp_addr;
/* check model ID */
- reg8_read(client, GW5200_PID, &pid);
+ ret = reg8_read(client, GW5200_PID, &pid);
if (pid == GW5200_VERSION_REG)
break;
@@ -368,6 +374,23 @@ static int gw5200_initialize(struct i2c_client *client)
ret = -ENODEV;
goto err;
}
+#else
+ // Workaround: GW5200 has some hidden protocol to access it's registers, hence check serializer and dts
+ tmp_addr = client->addr;
+ if (priv->ti9x4_addr) {
+ client->addr = priv->ti9x3_addr; /* Serializer I2C address */
+ /* check UB953 ID */
+ reg8_read(client, 0xf1, &pid);
+ }
+ client->addr = tmp_addr;
+
+ if (pid != 'U') {
+ dev_dbg(&client->dev, "Product ID error %x\n", pid);
+ ret = -ENODEV;
+ goto err;
+ }
+#endif
+
#if 0
/* Program wizard registers */
gw5200_set_regs(client, gw5200_regs_wizard, ARRAY_SIZE(gw5200_regs_wizard));
@@ -393,6 +416,8 @@ static int gw5200_parse_dt(struct device_node *np, struct gw5200_priv *priv)
if (!endpoint)
break;
+ of_property_read_u32(endpoint, "gw5200", &priv->gw5200);
+
rendpoint = of_parse_phandle(endpoint, "remote-endpoint", 0);
if (!rendpoint)
continue;
@@ -437,6 +462,12 @@ static int gw5200_parse_dt(struct device_node *np, struct gw5200_priv *priv)
mdelay(10);
+ if (gw5200)
+ priv->gw5200 = gw5200;
+
+ if (!priv->gw5200)
+ return -ENODEV;
+
return 0;
}
--
2.7.4
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