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From: Robert Foss <robert.foss@linaro.org>
To: Dongchun Zhu <dongchun.zhu@mediatek.com>,
	Fabio Estevam <festevam@gmail.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Sakari Ailus <sakari.ailus@iki.fi>,
	Tomasz Figa <tfiga@chromium.org>,
	linux-media@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Cc: Robert Foss <robert.foss@linaro.org>
Subject: [PATCH v3 3/3] media: ov8856: Implement sensor module revision identification
Date: Tue, 31 Mar 2020 15:33:46 +0200
Message-ID: <20200331133346.372517-4-robert.foss@linaro.org> (raw)
In-Reply-To: <20200331133346.372517-1-robert.foss@linaro.org>

Query the sensor for its module revision, and compare it
to known revisions.
Currently only the '1B' revision has been added.

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

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


 drivers/media/i2c/ov8856.c | 51 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
index 260aaf332631..c7551cee2bb0 100644
--- a/drivers/media/i2c/ov8856.c
+++ b/drivers/media/i2c/ov8856.c
@@ -32,6 +32,18 @@
 #define OV8856_MODE_STANDBY		0x00
 #define OV8856_MODE_STREAMING		0x01
 
+/* define 1B module revision */
+#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
@@ -1152,6 +1164,45 @@ 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_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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Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-31 13:33 [PATCH v3 0/3] media: ov8856: Add devicetree support Robert Foss
2020-03-31 13:33 ` [PATCH v6 1/3] media: dt-bindings: ov8856: Document YAML bindings Robert Foss
2020-03-31 15:12   ` Marco Felsch
2020-04-02  9:57     ` Robert Foss
2020-04-03 19:21       ` Marco Felsch
2020-04-01  8:07   ` Maxime Ripard
2020-04-02 10:10     ` Robert Foss
2020-04-03 23:27       ` Sakari Ailus
2020-04-04  9:34         ` Maxime Ripard
2020-04-06  8:25           ` Robert Foss
2020-04-06  8:35           ` Sakari Ailus
2020-04-07  8:36             ` Maxime Ripard
2020-04-07 11:29               ` Robert Foss
2020-04-07 12:32                 ` Maxime Ripard
2020-04-07 15:47                   ` Robert Foss
2020-04-07 16:39                     ` Sakari Ailus
2020-04-07 16:46                       ` Tomasz Figa
2020-04-07 17:20                         ` Sakari Ailus
2020-04-08 12:21                           ` Maxime Ripard
2020-04-08 12:35                             ` Tomasz Figa
2020-04-08 13:43                               ` Maxime Ripard
2020-04-08 15:28                                 ` Sakari Ailus
2020-04-08 15:30                                   ` Sakari Ailus
2020-04-08 16:34                                     ` Andy Shevchenko
2020-04-15 10:18                                     ` Maxime Ripard
2020-04-15 11:10                                       ` Robert Foss
2020-04-15 16:16                                       ` Sakari Ailus
2020-04-20 15:02                                         ` Maxime Ripard
2020-04-09  8:32                                   ` Robert Foss
2020-04-07 16:20                   ` Sakari Ailus
2020-04-04  9:23       ` Maxime Ripard
2020-03-31 13:33 ` [PATCH v3 2/3] media: ov8856: Add devicetree support Robert Foss
2020-03-31 14:01   ` Andy Shevchenko
2020-04-06 13:37     ` Robert Foss
2020-04-06 15:06       ` Andy Shevchenko
2020-04-06 15:25         ` Robert Foss
2020-04-03 23:33   ` Sakari Ailus
2020-03-31 13:33 ` Robert Foss [this message]

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