From: Ricardo Ribalda <ribalda@chromium.org>
Date: Thu, 23 Mar 2023 23:44:20 +0100
Subject: [PATCH] media: ov8856: Do not check for for module version
References: bsc#1012628
Patch-mainline: 6.3.2
Git-commit: 5a4e1b5aed2a36a10d6a3b30fafb6b3bf41c3186

commit 5a4e1b5aed2a36a10d6a3b30fafb6b3bf41c3186 upstream.

It the device is probed in non-zero ACPI D state, the module
identification is delayed until the first streamon.

The module identification has two parts: deviceID and version. To rea
the version we have to enable OTP read. This cannot be done during
streamon, becase it modifies REG_MODE_SELECT.

Since the driver has the same behaviour for all the module versions, do
not read the module version from the sensor's OTP.

Cc: stable@vger.kernel.org
Fixes: 0e014f1a8d54 ("media: ov8856: support device probe in non-zero ACPI D state")
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/media/i2c/ov8856.c | 40 --------------------------------------
 1 file changed, 40 deletions(-)

diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
index cf8384e0..b5c78813 100644
--- a/drivers/media/i2c/ov8856.c
+++ b/drivers/media/i2c/ov8856.c
@@ -1709,46 +1709,6 @@ static int ov8856_identify_module(struct ov8856 *ov8856)
 		return -ENXIO;
 	}
 
-	ret = ov8856_write_reg(ov8856, OV8856_REG_MODE_SELECT,
-			       OV8856_REG_VALUE_08BIT, OV8856_MODE_STREAMING);
-	if (ret)
-		return ret;
-
-	ret = ov8856_write_reg(ov8856, OV8856_OTP_MODE_CTRL,
-			       OV8856_REG_VALUE_08BIT, OV8856_OTP_MODE_AUTO);
-	if (ret) {
-		dev_err(&client->dev, "failed to set otp mode");
-		return ret;
-	}
-
-	ret = ov8856_write_reg(ov8856, OV8856_OTP_LOAD_CTRL,
-			       OV8856_REG_VALUE_08BIT,
-			       OV8856_OTP_LOAD_CTRL_ENABLE);
-	if (ret) {
-		dev_err(&client->dev, "failed to enable load control");
-		return ret;
-	}
-
-	ret = ov8856_read_reg(ov8856, OV8856_MODULE_REVISION,
-			      OV8856_REG_VALUE_08BIT, &val);
-	if (ret) {
-		dev_err(&client->dev, "failed to read module revision");
-		return ret;
-	}
-
-	dev_info(&client->dev, "OV8856 revision %x (%s) at address 0x%02x\n",
-		 val,
-		 val == OV8856_2A_MODULE ? "2A" :
-		 val == OV8856_1B_MODULE ? "1B" : "unknown revision",
-		 client->addr);
-
-	ret = ov8856_write_reg(ov8856, OV8856_REG_MODE_SELECT,
-			       OV8856_REG_VALUE_08BIT, OV8856_MODE_STANDBY);
-	if (ret) {
-		dev_err(&client->dev, "failed to exit streaming mode");
-		return ret;
-	}
-
 	ov8856->identified = true;
 
 	return 0;
-- 
2.35.3