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From: Robert Foss <robert.foss@linaro.org>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Sakari Ailus <sakari.ailus@iki.fi>,
	Marco Felsch <m.felsch@pengutronix.de>,
	Maxime Ripard <maxime@cerno.tech>,
	linux-media@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Cc: Dongchun Zhu <dongchun.zhu@mediatek.com>,
	Fabio Estevam <festevam@gmail.com>,
	Tomasz Figa <tfiga@chromium.org>, Ben Kao <ben.kao@intel.com>,
	Robert Foss <robert.foss@linaro.org>
Subject: [PATCH v8 3/3] media: ov8856: Implement sensor module revision identification
Date: Mon, 11 May 2020 13:03:50 +0200	[thread overview]
Message-ID: <20200511110350.11565-4-robert.foss@linaro.org> (raw)
In-Reply-To: <20200511110350.11565-1-robert.foss@linaro.org>

Query the sensor for its module revision, and compare it
to known revisions.

Currently 2A and 1B revision indentification is supported.

Signed-off-by: Robert Foss <robert.foss@linaro.org>
---

- Changes since v7:
  * Marco: Align broken line

- Changes since v3:
  * Actually add module revision 2A

- Changes since v2:
  * Add module revision 2A
  * Sakari: Remove ov8856_check_revision()
  * Sakari: Stop EEPROM streaming mode

 drivers/media/i2c/ov8856.c | 53 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
index 68cf2d6c5804..1657e03d9a9d 100644
--- a/drivers/media/i2c/ov8856.c
+++ b/drivers/media/i2c/ov8856.c
@@ -32,6 +32,19 @@
 #define OV8856_MODE_STANDBY		0x00
 #define OV8856_MODE_STREAMING		0x01
 
+/* module revisions */
+#define OV8856_2A_MODULE		0x01
+#define OV8856_1B_MODULE		0x02
+
+/* the OTP read-out buffer is at 0x7000 and 0xf is the offset
+ * of the byte in the OTP that means the module revision
+ */
+#define OV8856_MODULE_REVISION		0x700f
+#define OV8856_OTP_MODE_CTRL		0x3d84
+#define OV8856_OTP_LOAD_CTRL		0x3d81
+#define OV8856_OTP_MODE_AUTO		0x00
+#define OV8856_OTP_LOAD_CTRL_ENABLE	BIT(0)
+
 /* vertical-timings from sensor */
 #define OV8856_REG_VTS			0x380e
 #define OV8856_VTS_MAX			0x7fff
@@ -1156,6 +1169,46 @@ 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;
+	}
+
 	return 0;
 }
 
-- 
2.25.1


WARNING: multiple messages have this Message-ID (diff)
From: Robert Foss <robert.foss@linaro.org>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Sakari Ailus <sakari.ailus@iki.fi>,
	Marco Felsch <m.felsch@pengutronix.de>,
	Maxime Ripard <maxime@cerno.tech>,
	linux-media@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Cc: Ben Kao <ben.kao@intel.com>, Fabio Estevam <festevam@gmail.com>,
	Dongchun Zhu <dongchun.zhu@mediatek.com>,
	Robert Foss <robert.foss@linaro.org>,
	Tomasz Figa <tfiga@chromium.org>
Subject: [PATCH v8 3/3] media: ov8856: Implement sensor module revision identification
Date: Mon, 11 May 2020 13:03:50 +0200	[thread overview]
Message-ID: <20200511110350.11565-4-robert.foss@linaro.org> (raw)
In-Reply-To: <20200511110350.11565-1-robert.foss@linaro.org>

Query the sensor for its module revision, and compare it
to known revisions.

Currently 2A and 1B revision indentification is supported.

Signed-off-by: Robert Foss <robert.foss@linaro.org>
---

- Changes since v7:
  * Marco: Align broken line

- Changes since v3:
  * Actually add module revision 2A

- Changes since v2:
  * Add module revision 2A
  * Sakari: Remove ov8856_check_revision()
  * Sakari: Stop EEPROM streaming mode

 drivers/media/i2c/ov8856.c | 53 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
index 68cf2d6c5804..1657e03d9a9d 100644
--- a/drivers/media/i2c/ov8856.c
+++ b/drivers/media/i2c/ov8856.c
@@ -32,6 +32,19 @@
 #define OV8856_MODE_STANDBY		0x00
 #define OV8856_MODE_STREAMING		0x01
 
+/* module revisions */
+#define OV8856_2A_MODULE		0x01
+#define OV8856_1B_MODULE		0x02
+
+/* the OTP read-out buffer is at 0x7000 and 0xf is the offset
+ * of the byte in the OTP that means the module revision
+ */
+#define OV8856_MODULE_REVISION		0x700f
+#define OV8856_OTP_MODE_CTRL		0x3d84
+#define OV8856_OTP_LOAD_CTRL		0x3d81
+#define OV8856_OTP_MODE_AUTO		0x00
+#define OV8856_OTP_LOAD_CTRL_ENABLE	BIT(0)
+
 /* vertical-timings from sensor */
 #define OV8856_REG_VTS			0x380e
 #define OV8856_VTS_MAX			0x7fff
@@ -1156,6 +1169,46 @@ 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;
+	}
+
 	return 0;
 }
 
-- 
2.25.1


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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2020-05-11 11:04 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-11 11:03 [PATCH v8 0/3] media: ov8856: Add devicetree support Robert Foss
2020-05-11 11:03 ` Robert Foss
2020-05-11 11:03 ` [PATCH v11 1/3] media: dt-bindings: ov8856: Document YAML bindings Robert Foss
2020-05-11 11:03   ` Robert Foss
2020-05-11 11:03 ` [PATCH v8 2/3] media: ov8856: Add devicetree support Robert Foss
2020-05-11 11:03   ` Robert Foss
2020-05-12  0:25   ` Sakari Ailus
2020-05-12  0:25     ` Sakari Ailus
2020-05-12  8:13     ` Robert Foss
2020-05-12  8:13       ` Robert Foss
2020-05-11 11:03 ` Robert Foss [this message]
2020-05-11 11:03   ` [PATCH v8 3/3] media: ov8856: Implement sensor module revision identification Robert Foss

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