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Subject: media: i2c: ov5645: Fix power sequence
Author:  Ezequiel Garcia <ezequ...@collabora.com>
Date:    Thu Aug 8 08:05:40 2019 -0300

This is mostly a port of Jacopo's fix:

  commit aa4bb8b8838ffcc776a79f49a4d7476b82405349
  Author: Jacopo Mondi <jac...@jmondi.org>
  Date:   Fri Jul 6 05:51:52 2018 -0400

  media: ov5640: Re-work MIPI startup sequence

In the OV5645 case, the changes are:

- At set_power(1) time power up MIPI Tx/Rx and set data and clock lanes in
  LP11 during 'sleep' and 'idle' with MIPI clock in non-continuous mode.
- At set_power(0) time power down MIPI Tx/Rx (in addition to the current
  power down of regulators and clock gating).
- At s_stream time enable/disable the MIPI interface output.

With this commit the sensor is able to enter LP-11 mode during power up,
as expected by some CSI-2 controllers.

Many thanks to Fabio Estevam for his help debugging this issue.

Tested-by: Fabio Estevam <feste...@gmail.com>
Signed-off-by: Ezequiel Garcia <ezequ...@collabora.com>
Reviewed-by: Philipp Zabel <p.za...@pengutronix.de>
Reviewed-by: Jacopo Mondi <jac...@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+sams...@kernel.org>

 drivers/media/i2c/ov5645.c | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

---

diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index 7721cce8353c..a6c17d15d754 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -41,6 +41,8 @@
 #define                OV5645_CHIP_ID_HIGH_BYTE        0x56
 #define OV5645_CHIP_ID_LOW             0x300b
 #define                OV5645_CHIP_ID_LOW_BYTE         0x45
+#define OV5645_IO_MIPI_CTRL00          0x300e
+#define OV5645_PAD_OUTPUT00            0x3019
 #define OV5645_AWB_MANUAL_CONTROL      0x3406
 #define                OV5645_AWB_MANUAL_ENABLE        BIT(0)
 #define OV5645_AEC_PK_MANUAL           0x3503
@@ -51,6 +53,7 @@
 #define                OV5645_ISP_VFLIP                BIT(2)
 #define OV5645_TIMING_TC_REG21         0x3821
 #define                OV5645_SENSOR_MIRROR            BIT(1)
+#define OV5645_MIPI_CTRL00             0x4800
 #define OV5645_PRE_ISP_TEST_SETTING_1  0x503d
 #define                OV5645_TEST_PATTERN_MASK        0x3
 #define                OV5645_SET_TEST_PATTERN(x)      ((x) & 
OV5645_TEST_PATTERN_MASK)
@@ -124,7 +127,6 @@ static const struct reg_value ov5645_global_init_setting[] 
= {
        { 0x3503, 0x07 },
        { 0x3002, 0x1c },
        { 0x3006, 0xc3 },
-       { 0x300e, 0x45 },
        { 0x3017, 0x00 },
        { 0x3018, 0x00 },
        { 0x302e, 0x0b },
@@ -353,7 +355,10 @@ static const struct reg_value ov5645_global_init_setting[] 
= {
        { 0x3a1f, 0x14 },
        { 0x0601, 0x02 },
        { 0x3008, 0x42 },
-       { 0x3008, 0x02 }
+       { 0x3008, 0x02 },
+       { OV5645_IO_MIPI_CTRL00, 0x40 },
+       { OV5645_MIPI_CTRL00, 0x24 },
+       { OV5645_PAD_OUTPUT00, 0x70 }
 };
 
 static const struct reg_value ov5645_setting_sxga[] = {
@@ -690,13 +695,9 @@ static int ov5645_s_power(struct v4l2_subdev *sd, int on)
                                goto exit;
                        }
 
-                       ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
-                                              OV5645_SYSTEM_CTRL0_STOP);
-                       if (ret < 0) {
-                               ov5645_set_power_off(ov5645);
-                               goto exit;
-                       }
+                       usleep_range(500, 1000);
                } else {
+                       ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
                        ov5645_set_power_off(ov5645);
                }
        }
@@ -1002,11 +1003,20 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, 
int enable)
                        dev_err(ov5645->dev, "could not sync v4l2 controls\n");
                        return ret;
                }
+
+               ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x45);
+               if (ret < 0)
+                       return ret;
+
                ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
                                       OV5645_SYSTEM_CTRL0_START);
                if (ret < 0)
                        return ret;
        } else {
+               ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
+               if (ret < 0)
+                       return ret;
+
                ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
                                       OV5645_SYSTEM_CTRL0_STOP);
                if (ret < 0)

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