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From 07aec3b12f833316963d45681f2dcbf688973621 Mon Sep 17 00:00:00 2001
From: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Date: Wed, 25 Mar 2020 14:34:14 +0300
Subject: [PATCH] media: i2c: max9286: increase i2c freq inside GMSL cahnnel
This slightly (10%) increases the i2c transaction speed over GMSL.
Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
---
drivers/media/i2c/soc_camera/max9286.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/media/i2c/soc_camera/max9286.c b/drivers/media/i2c/soc_camera/max9286.c
index 05247ff..28bd3c3 100644
--- a/drivers/media/i2c/soc_camera/max9286.c
+++ b/drivers/media/i2c/soc_camera/max9286.c
@@ -31,7 +31,7 @@
#define MAXIM_I2C_I2C_SPEED_105KHZ (0x3 << 2) /* 105 kbps */
#define MAXIM_I2C_I2C_SPEED_085KHZ (0x2 << 2) /* 84.7 kbps */
#define MAXIM_I2C_I2C_SPEED_028KHZ (0x1 << 2) /* 28.3 kbps */
-#define MAXIM_I2C_I2C_SPEED MAXIM_I2C_I2C_SPEED_339KHZ
+#define MAXIM_I2C_I2C_SPEED MAXIM_I2C_I2C_SPEED_837KHZ
struct max9286_priv {
struct v4l2_subdev sd[4];
@@ -270,6 +270,7 @@ static void max9286_postinit(struct i2c_client *client, int addr)
reg8_write(client, 0x0b, priv->csi2_outord); /* CSI2 output order */
reg8_write(client, 0x15, 0x9b); /* enable CSI output, VC is set accordingly to Link number, BIT7 magic must be set */
reg8_write(client, 0x1b, priv->switchin | priv->links_mask); /* coax polarity, enable equalizer for CAMs */
+ reg8_write(client, 0x34, 0x22 | MAXIM_I2C_I2C_SPEED); /* disable artificial ACK, I2C speed set */
usleep_range(5000, 5500); /* wait 2ms after any change of reverse channel settings */
if (strcmp(priv->fsync_mode, "manual") == 0) {
--
2.7.4
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