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Subject: [PATCH 14/23] media: i2c: imx258: Issue reset before starting streaming
Date: Wed, 27 Mar 2024 17:17:00 -0600
Message-ID: <20240327231710.53188-15-git@luigi311.com>
In-Reply-To: <20240327231710.53188-1-git@luigi311.com>
References: <20240327231710.53188-1-git@luigi311.com>
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>

Whilst not documented, register 0x0103 bit 0 is the soft
reset for the sensor, so send it before trying to configure
the sensor.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/media/i2c/imx258.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
index c2c5e819ddc0..a62ed8c26663 100644
--- a/drivers/media/i2c/imx258.c
+++ b/drivers/media/i2c/imx258.c
@@ -20,6 +20,8 @@
 #define IMX258_MODE_STANDBY		0x00
 #define IMX258_MODE_STREAMING		0x01
 
+#define IMX258_REG_RESET		0x0103
+
 /* Chip ID */
 #define IMX258_REG_CHIP_ID		0x0016
 #define IMX258_CHIP_ID			0x0258
@@ -1059,6 +1061,16 @@ static int imx258_start_streaming(struct imx258 *imx258)
 	const struct imx258_link_freq_config *link_freq_cfg;
 	int ret, link_freq_index;
 
+	ret = imx258_write_reg(imx258, IMX258_REG_RESET, IMX258_REG_VALUE_08BIT,
+			       0x01);
+	if (ret) {
+		dev_err(&client->dev, "%s failed to reset sensor\n", __func__);
+		return ret;
+	}
+
+	/* 12ms is required from poweron to standby */
+	fsleep(12000);
+
 	/* Setup PLL */
 	link_freq_index = imx258->cur_mode->link_freq_index;
 	link_freq_cfg = &imx258->link_freq_configs[link_freq_index];
-- 
2.42.0