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From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
To:     Jacopo Mondi <jacopo@jmondi.org>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Steve Longerbeam <slongerbeam@gmail.com>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        linux-media@vger.kernel.org,
        Hugues Fruchet <hugues.fruchet@st.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc:     linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
        Biju Das <biju.das.jz@bp.renesas.com>,
        Prabhakar <prabhakar.csengg@gmail.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Subject: [PATCH 1/2] media: i2c: ov5640: Enable data pins on startup for DVP mode
Date:   Fri, 31 Jul 2020 10:24:46 +0100
Message-Id: <1596187487-31403-2-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com>
In-Reply-To: <1596187487-31403-1-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com>
References: <1596187487-31403-1-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

During testing this sensor on iW-RainboW-G21D-Qseven platform noticed the
capture worked only for first run and for subsequent runs it failed.

This patch does the following in DVP mode:
1: Enables data lines on power up
2: Configures HVP lines on power up instead of configuring everytime on
   stream ON/OFF
3: Disables MIPI interface.
4: Puts the sensor in power down mode during stream OFF.

Fixes: f22996db44e2d ("media: ov5640: add support of DVP parallel interface")
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
---
 drivers/media/i2c/ov5640.c | 253 +++++++++++++++++++++------------------------
 1 file changed, 120 insertions(+), 133 deletions(-)

diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
index 2fe4a7a..ac305a5 100644
--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -274,7 +274,7 @@ static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl)
 /* YUV422 UYVY VGA@30fps */
 static const struct reg_value ov5640_init_setting_30fps_VGA[] = {
 	{0x3103, 0x11, 0, 0}, {0x3008, 0x82, 0, 5}, {0x3008, 0x42, 0, 0},
-	{0x3103, 0x03, 0, 0}, {0x3017, 0x00, 0, 0}, {0x3018, 0x00, 0, 0},
+	{0x3103, 0x03, 0, 0},
 	{0x3630, 0x36, 0, 0},
 	{0x3631, 0x0e, 0, 0}, {0x3632, 0xe2, 0, 0}, {0x3633, 0x12, 0, 0},
 	{0x3621, 0xe0, 0, 0}, {0x3704, 0xa0, 0, 0}, {0x3703, 0x5a, 0, 0},
@@ -1210,96 +1210,7 @@ static int ov5640_set_autogain(struct ov5640_dev *sensor, bool on)
 
 static int ov5640_set_stream_dvp(struct ov5640_dev *sensor, bool on)
 {
-	int ret;
-	unsigned int flags = sensor->ep.bus.parallel.flags;
-	u8 pclk_pol = 0;
-	u8 hsync_pol = 0;
-	u8 vsync_pol = 0;
-
-	/*
-	 * Note about parallel port configuration.
-	 *
-	 * When configured in parallel mode, the OV5640 will
-	 * output 10 bits data on DVP data lines [9:0].
-	 * If only 8 bits data are wanted, the 8 bits data lines
-	 * of the camera interface must be physically connected
-	 * on the DVP data lines [9:2].
-	 *
-	 * Control lines polarity can be configured through
-	 * devicetree endpoint control lines properties.
-	 * If no endpoint control lines properties are set,
-	 * polarity will be as below:
-	 * - VSYNC:	active high
-	 * - HREF:	active low
-	 * - PCLK:	active low
-	 */
-
-	if (on) {
-		/*
-		 * configure parallel port control lines polarity
-		 *
-		 * POLARITY CTRL0
-		 * - [5]:	PCLK polarity (0: active low, 1: active high)
-		 * - [1]:	HREF polarity (0: active low, 1: active high)
-		 * - [0]:	VSYNC polarity (mismatch here between
-		 *		datasheet and hardware, 0 is active high
-		 *		and 1 is active low...)
-		 */
-		if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
-			pclk_pol = 1;
-		if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
-			hsync_pol = 1;
-		if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
-			vsync_pol = 1;
-
-		ret = ov5640_write_reg(sensor,
-				       OV5640_REG_POLARITY_CTRL00,
-				       (pclk_pol << 5) |
-				       (hsync_pol << 1) |
-				       vsync_pol);
-
-		if (ret)
-			return ret;
-	}
-
-	/*
-	 * powerdown MIPI TX/RX PHY & disable MIPI
-	 *
-	 * MIPI CONTROL 00
-	 * 4:	 PWDN PHY TX
-	 * 3:	 PWDN PHY RX
-	 * 2:	 MIPI enable
-	 */
-	ret = ov5640_write_reg(sensor,
-			       OV5640_REG_IO_MIPI_CTRL00, on ? 0x18 : 0);
-	if (ret)
-		return ret;
-
-	/*
-	 * enable VSYNC/HREF/PCLK DVP control lines
-	 * & D[9:6] DVP data lines
-	 *
-	 * PAD OUTPUT ENABLE 01
-	 * - 6:		VSYNC output enable
-	 * - 5:		HREF output enable
-	 * - 4:		PCLK output enable
-	 * - [3:0]:	D[9:6] output enable
-	 */
-	ret = ov5640_write_reg(sensor,
-			       OV5640_REG_PAD_OUTPUT_ENABLE01,
-			       on ? 0x7f : 0);
-	if (ret)
-		return ret;
-
-	/*
-	 * enable D[5:0] DVP data lines
-	 *
-	 * PAD OUTPUT ENABLE 02
-	 * - [7:2]:	D[5:0] output enable
-	 */
-	return ov5640_write_reg(sensor,
-				OV5640_REG_PAD_OUTPUT_ENABLE02,
-				on ? 0xfc : 0);
+	return ov5640_write_reg(sensor, OV5640_REG_SYS_CTRL0, on ? 0x2 : 0x42);
 }
 
 static int ov5640_set_stream_mipi(struct ov5640_dev *sensor, bool on)
@@ -2003,6 +1914,10 @@ static void ov5640_set_power_off(struct ov5640_dev *sensor)
 
 static int ov5640_set_power(struct ov5640_dev *sensor, bool on)
 {
+	unsigned int flags = sensor->ep.bus.parallel.flags;
+	u8 pclk_pol = 0;
+	u8 hsync_pol = 0;
+	u8 vsync_pol = 0;
 	int ret = 0;
 
 	if (on) {
@@ -2014,52 +1929,124 @@ static int ov5640_set_power(struct ov5640_dev *sensor, bool on)
 		if (ret)
 			goto power_off;
 
-		/* We're done here for DVP bus, while CSI-2 needs setup. */
-		if (sensor->ep.bus_type != V4L2_MBUS_CSI2_DPHY)
-			return 0;
+		/* CSI-2 setup. */
+		if (sensor->ep.bus_type == V4L2_MBUS_CSI2_DPHY) {
+			/*
+			 * Power up MIPI HS Tx and LS Rx; 2 data lanes mode
+			 *
+			 * 0x300e = 0x40
+			 * [7:5] = 010	: 2 data lanes mode (see FIXME note in
+			 *		  "ov5640_set_stream_mipi()")
+			 * [4] = 0	: Power up MIPI HS Tx
+			 * [3] = 0	: Power up MIPI LS Rx
+			 * [2] = 0	: MIPI interface disabled
+			 */
+			ret = ov5640_write_reg(sensor, OV5640_REG_IO_MIPI_CTRL00, 0x40);
+			if (ret)
+				goto power_off;
 
-		/*
-		 * Power up MIPI HS Tx and LS Rx; 2 data lanes mode
-		 *
-		 * 0x300e = 0x40
-		 * [7:5] = 010	: 2 data lanes mode (see FIXME note in
-		 *		  "ov5640_set_stream_mipi()")
-		 * [4] = 0	: Power up MIPI HS Tx
-		 * [3] = 0	: Power up MIPI LS Rx
-		 * [2] = 0	: MIPI interface disabled
-		 */
-		ret = ov5640_write_reg(sensor,
-				       OV5640_REG_IO_MIPI_CTRL00, 0x40);
-		if (ret)
-			goto power_off;
+			/*
+			 * Gate clock and set LP11 in 'no packets mode' (idle)
+			 *
+			 * 0x4800 = 0x24
+			 * [5] = 1	: Gate clock when 'no packets'
+			 * [2] = 1	: MIPI bus in LP11 when 'no packets'
+			 */
+			ret = ov5640_write_reg(sensor, OV5640_REG_MIPI_CTRL00, 0x24);
+			if (ret)
+				goto power_off;
 
-		/*
-		 * Gate clock and set LP11 in 'no packets mode' (idle)
-		 *
-		 * 0x4800 = 0x24
-		 * [5] = 1	: Gate clock when 'no packets'
-		 * [2] = 1	: MIPI bus in LP11 when 'no packets'
-		 */
-		ret = ov5640_write_reg(sensor,
-				       OV5640_REG_MIPI_CTRL00, 0x24);
-		if (ret)
-			goto power_off;
+			/*
+			 * Set data lanes and clock in LP11 when 'sleeping'
+			 *
+			 * 0x3019 = 0x70
+			 * [6] = 1	: MIPI data lane 2 in LP11 when 'sleeping'
+			 * [5] = 1	: MIPI data lane 1 in LP11 when 'sleeping'
+			 * [4] = 1	: MIPI clock lane in LP11 when 'sleeping'
+			 */
+			ret = ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT00, 0x70);
+			if (ret)
+				goto power_off;
 
-		/*
-		 * Set data lanes and clock in LP11 when 'sleeping'
-		 *
-		 * 0x3019 = 0x70
-		 * [6] = 1	: MIPI data lane 2 in LP11 when 'sleeping'
-		 * [5] = 1	: MIPI data lane 1 in LP11 when 'sleeping'
-		 * [4] = 1	: MIPI clock lane in LP11 when 'sleeping'
-		 */
-		ret = ov5640_write_reg(sensor,
-				       OV5640_REG_PAD_OUTPUT00, 0x70);
-		if (ret)
-			goto power_off;
+			/* Give lanes some time to coax into LP11 state. */
+			usleep_range(500, 1000);
+		} else {
+			/*
+			 * Note about parallel port configuration.
+			 *
+			 * When configured in parallel mode, the OV5640 will
+			 * output 10 bits data on DVP data lines [9:0].
+			 * If only 8 bits data are wanted, the 8 bits data lines
+			 * of the camera interface must be physically connected
+			 * on the DVP data lines [9:2].
+			 *
+			 * Control lines polarity can be configured through
+			 * devicetree endpoint control lines properties.
+			 * If no endpoint control lines properties are set,
+			 * polarity will be as below:
+			 * - VSYNC:	active high
+			 * - HREF:	active low
+			 * - PCLK:	active low
+			 */
+			/*
+			 * configure parallel port control lines polarity
+			 *
+			 * POLARITY CTRL0
+			 * - [5]:	PCLK polarity (0: active low, 1: active high)
+			 * - [1]:	HREF polarity (0: active low, 1: active high)
+			 * - [0]:	VSYNC polarity (mismatch here between
+			 *		datasheet and hardware, 0 is active high
+			 *		and 1 is active low...)
+			 */
+			if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
+				pclk_pol = 1;
+			if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
+				hsync_pol = 1;
+			if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
+				vsync_pol = 1;
+
+			ret = ov5640_write_reg(sensor, OV5640_REG_POLARITY_CTRL00,
+					       (pclk_pol << 5) | (hsync_pol << 1) | vsync_pol);
+
+			if (ret)
+				goto power_off;
+
+			/*
+			 * powerdown MIPI TX/RX PHY & disable MIPI
+			 *
+			 * MIPI CONTROL 00
+			 * 4:	 PWDN PHY TX
+			 * 3:	 PWDN PHY RX
+			 * 2:	 MIPI enable
+			 */
+			ret = ov5640_write_reg(sensor, OV5640_REG_IO_MIPI_CTRL00, 0x18);
+			if (ret)
+				goto power_off;
+
+			/*
+			 * enable VSYNC/HREF/PCLK DVP control lines
+			 * & D[9:6] DVP data lines
+			 *
+			 * PAD OUTPUT ENABLE 01
+			 * - 6:		VSYNC output enable
+			 * - 5:		HREF output enable
+			 * - 4:		PCLK output enable
+			 * - [3:0]:	D[9:6] output enable
+			 */
+			ret = ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT_ENABLE01, 0x7f);
+			if (ret)
+				goto power_off;
 
-		/* Give lanes some time to coax into LP11 state. */
-		usleep_range(500, 1000);
+			/*
+			 * enable D[5:0] DVP data lines
+			 *
+			 * PAD OUTPUT ENABLE 02
+			 * - [7:2]:	D[5:0] output enable
+			 */
+			ret = ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT_ENABLE02, 0xfc);
+			if (ret)
+				goto power_off;
+		}
 
 	} else {
 		if (sensor->ep.bus_type == V4L2_MBUS_CSI2_DPHY) {
-- 
2.7.4