[PATCH 5.10 125/717] media: ov5640: fix support of BT656 bus mode

Greg Kroah-Hartman
2020-12-28T14:05:53Z

From: Hugues Fruchet <hugues.fruchet@st.com>

[ Upstream commit 68579b32e786f9680e7c6b6c7d17e26943bb02b3 ]

Fix PCLK polarity not being taken into account.
Add comments about BT656 register control.
Remove useless ov5640_set_stream_bt656() function.
Refine comments about MIPI IO register control.

Fixes: 4039b03720f7 ("media: i2c: ov5640: Add support for BT656 mode")
Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/i2c/ov5640.c | 82 +++++++++++++++++++++-----------------
1 file changed, 45 insertions(+), 37 deletions(-)

diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
index 8d0254d0e5ea7..8f0812e859012 100644
--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -1216,20 +1216,6 @@ static int ov5640_set_autogain(struct ov5640_dev *sensor, bool on)
BIT(1), on ? 0 : BIT(1));
}

-static int ov5640_set_stream_bt656(struct ov5640_dev *sensor, bool on)
-{
- int ret;
-
- ret = ov5640_write_reg(sensor, OV5640_REG_CCIR656_CTRL00,
- on ? 0x1 : 0x00);
- if (ret)
- return ret;
-
- return ov5640_write_reg(sensor, OV5640_REG_SYS_CTRL0, on ?
- OV5640_REG_SYS_CTRL0_SW_PWUP :
- OV5640_REG_SYS_CTRL0_SW_PWDN);
-}
-
static int ov5640_set_stream_dvp(struct ov5640_dev *sensor, bool on)
{
return ov5640_write_reg(sensor, OV5640_REG_SYS_CTRL0, on ?
@@ -1994,13 +1980,13 @@ static int ov5640_set_power_mipi(struct ov5640_dev *sensor, bool on)
static int ov5640_set_power_dvp(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;
+ bool bt656 = sensor->ep.bus_type == V4L2_MBUS_BT656;
+ u8 polarities = 0;
int ret;

if (!on) {
/* Reset settings to their default values. */
+ ov5640_write_reg(sensor, OV5640_REG_CCIR656_CTRL00, 0x00);
ov5640_write_reg(sensor, OV5640_REG_IO_MIPI_CTRL00, 0x58);
ov5640_write_reg(sensor, OV5640_REG_POLARITY_CTRL00, 0x20);
ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT_ENABLE01, 0x00);
@@ -2024,7 +2010,35 @@ static int ov5640_set_power_dvp(struct ov5640_dev *sensor, bool on)
* - VSYNC: active high
* - HREF: active low
* - PCLK: active low
+ *
+ * VSYNC & HREF are not configured if BT656 bus mode is selected
*/
+
+ /*
+ * BT656 embedded synchronization configuration
+ *
+ * CCIR656 CTRL00
+ * - [7]: SYNC code selection (0: auto generate sync code,
+ * 1: sync code from regs 0x4732-0x4735)
+ * - [6]: f value in CCIR656 SYNC code when fixed f value
+ * - [5]: Fixed f value
+ * - [4:3]: Blank toggle data options (00: data=1'h040/1'h200,
+ * 01: data from regs 0x4736-0x4738, 10: always keep 0)
+ * - [1]: Clip data disable
+ * - [0]: CCIR656 mode enable
+ *
+ * Default CCIR656 SAV/EAV mode with default codes
+ * SAV=0xff000080 & EAV=0xff00009d is enabled here with settings:
+ * - CCIR656 mode enable
+ * - auto generation of sync codes
+ * - blank toggle data 1'h040/1'h200
+ * - clip reserved data (0x00 & 0xff changed to 0x01 & 0xfe)
+ */
+ ret = ov5640_write_reg(sensor, OV5640_REG_CCIR656_CTRL00,
+ bt656 ? 0x01 : 0x00);
+ if (ret)
+ return ret;
+
/*
* configure parallel port control lines polarity
*
@@ -2035,29 +2049,26 @@ static int ov5640_set_power_dvp(struct ov5640_dev *sensor, bool on)
* datasheet and hardware, 0 is active high
* and 1 is active low...)
*/
- if (sensor->ep.bus_type == V4L2_MBUS_PARALLEL) {
- if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
- pclk_pol = 1;
+ if (!bt656) {
if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
- hsync_pol = 1;
+ polarities |= BIT(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;
+ polarities |= BIT(0);
}
+ if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
+ polarities |= BIT(5);
+
+ ret = ov5640_write_reg(sensor, OV5640_REG_POLARITY_CTRL00, polarities);
+ if (ret)
+ return ret;

/*
- * powerdown MIPI TX/RX PHY & disable MIPI
+ * powerdown MIPI TX/RX PHY & enable DVP
*
* MIPI CONTROL 00
- * 4: PWDN PHY TX
- * 3: PWDN PHY RX
- * 2: MIPI enable
+ * [4] = 1 : Power down MIPI HS Tx
+ * [3] = 1 : Power down MIPI LS Rx
+ * [2] = 0 : DVP enable (MIPI disable)
*/
ret = ov5640_write_reg(sensor, OV5640_REG_IO_MIPI_CTRL00, 0x18);
if (ret)
@@ -2074,8 +2085,7 @@ static int ov5640_set_power_dvp(struct ov5640_dev *sensor, bool on)
* - [3:0]: D[9:6] output enable
*/
ret = ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT_ENABLE01,
- sensor->ep.bus_type == V4L2_MBUS_PARALLEL ?
- 0x7f : 0x1f);
+ bt656 ? 0x1f : 0x7f);
if (ret)
return ret;

@@ -2925,8 +2935,6 @@ static int ov5640_s_stream(struct v4l2_subdev *sd, int enable)

if (sensor->ep.bus_type == V4L2_MBUS_CSI2_DPHY)
ret = ov5640_set_stream_mipi(sensor, enable);
- else if (sensor->ep.bus_type == V4L2_MBUS_BT656)
- ret = ov5640_set_stream_bt656(sensor, enable);
else
ret = ov5640_set_stream_dvp(sensor, enable);

--
2.27.0