When supporting Rpi Camera v2 Module on the RZ/G2E, found the driver had
some issues with rcar mipi-csi driver. The sensor never entered into LP-11
state.
The powerup sequence in the datasheet[1] shows the sensor entering into
LP-11 in streaming mode, so to fix this issue transitions are performed
from "streaming -> standby" in the probe() after power up.
With this commit the sensor is able to enter LP-11 mode during power up,
as expected by some CSI-2 controllers.
[1] https://publiclab.org/system/images/photos/000/023/294/original/
RASPBERRY_PI_CAMERA_V2_DATASHEET_IMX219PQH5_7.0.0_Datasheet_XXX.PDF
Signed-off-by: Lad Prabhakar <[email protected]>
---
drivers/media/i2c/imx219.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
index f1effb5a5f66..16010ca1781a 100644
--- a/drivers/media/i2c/imx219.c
+++ b/drivers/media/i2c/imx219.c
@@ -1224,6 +1224,23 @@ static int imx219_probe(struct i2c_client *client)
/* Set default mode to max resolution */
imx219->mode = &supported_modes[0];
+ /* sensor doesn't enter LP-11 state upon power up until and unless
+ * streaming is started, so upon power up switch the modes to:
+ * streaming -> standby
+ */
+ ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
+ IMX219_REG_VALUE_08BIT, IMX219_MODE_STREAMING);
+ if (ret < 0)
+ goto error_power_off;
+ usleep_range(100, 110);
+
+ /* put sensor back to standby mode */
+ ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
+ IMX219_REG_VALUE_08BIT, IMX219_MODE_STANDBY);
+ if (ret < 0)
+ goto error_power_off;
+ usleep_range(100, 110);
+
ret = imx219_init_controls(imx219);
if (ret)
goto error_power_off;
--
2.20.1
Hi Prabhakar.
Thanks for the update.
On Fri, 6 Mar 2020 at 10:32, Lad Prabhakar <[email protected]> wrote:
>
> When supporting Rpi Camera v2 Module on the RZ/G2E, found the driver had
> some issues with rcar mipi-csi driver. The sensor never entered into LP-11
> state.
>
> The powerup sequence in the datasheet[1] shows the sensor entering into
> LP-11 in streaming mode, so to fix this issue transitions are performed
> from "streaming -> standby" in the probe() after power up.
>
> With this commit the sensor is able to enter LP-11 mode during power up,
> as expected by some CSI-2 controllers.
>
> [1] https://publiclab.org/system/images/photos/000/023/294/original/
> RASPBERRY_PI_CAMERA_V2_DATASHEET_IMX219PQH5_7.0.0_Datasheet_XXX.PDF
>
> Signed-off-by: Lad Prabhakar <[email protected]>
Acked-by: Dave Stevenson <[email protected]>
> ---
> drivers/media/i2c/imx219.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
> index f1effb5a5f66..16010ca1781a 100644
> --- a/drivers/media/i2c/imx219.c
> +++ b/drivers/media/i2c/imx219.c
> @@ -1224,6 +1224,23 @@ static int imx219_probe(struct i2c_client *client)
> /* Set default mode to max resolution */
> imx219->mode = &supported_modes[0];
>
> + /* sensor doesn't enter LP-11 state upon power up until and unless
> + * streaming is started, so upon power up switch the modes to:
> + * streaming -> standby
> + */
> + ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
> + IMX219_REG_VALUE_08BIT, IMX219_MODE_STREAMING);
> + if (ret < 0)
> + goto error_power_off;
> + usleep_range(100, 110);
> +
> + /* put sensor back to standby mode */
> + ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
> + IMX219_REG_VALUE_08BIT, IMX219_MODE_STANDBY);
> + if (ret < 0)
> + goto error_power_off;
> + usleep_range(100, 110);
> +
> ret = imx219_init_controls(imx219);
> if (ret)
> goto error_power_off;
> --
> 2.20.1
>
Hi Dave,
On Fri, Mar 6, 2020 at 1:01 PM Dave Stevenson
<[email protected]> wrote:
>
> Hi Prabhakar.
>
> Thanks for the update.
>
> On Fri, 6 Mar 2020 at 10:32, Lad Prabhakar <[email protected]> wrote:
> >
> > When supporting Rpi Camera v2 Module on the RZ/G2E, found the driver had
> > some issues with rcar mipi-csi driver. The sensor never entered into LP-11
> > state.
> >
> > The powerup sequence in the datasheet[1] shows the sensor entering into
> > LP-11 in streaming mode, so to fix this issue transitions are performed
> > from "streaming -> standby" in the probe() after power up.
> >
> > With this commit the sensor is able to enter LP-11 mode during power up,
> > as expected by some CSI-2 controllers.
> >
> > [1] https://publiclab.org/system/images/photos/000/023/294/original/
> > RASPBERRY_PI_CAMERA_V2_DATASHEET_IMX219PQH5_7.0.0_Datasheet_XXX.PDF
> >
> > Signed-off-by: Lad Prabhakar <[email protected]>
>
> Acked-by: Dave Stevenson <[email protected]>
>
Thank you for the Ack.
Cheers,
--Prabhakar
>
> > ---
> > drivers/media/i2c/imx219.c | 17 +++++++++++++++++
> > 1 file changed, 17 insertions(+)
> >
> > diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
> > index f1effb5a5f66..16010ca1781a 100644
> > --- a/drivers/media/i2c/imx219.c
> > +++ b/drivers/media/i2c/imx219.c
> > @@ -1224,6 +1224,23 @@ static int imx219_probe(struct i2c_client *client)
> > /* Set default mode to max resolution */
> > imx219->mode = &supported_modes[0];
> >
> > + /* sensor doesn't enter LP-11 state upon power up until and unless
> > + * streaming is started, so upon power up switch the modes to:
> > + * streaming -> standby
> > + */
> > + ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
> > + IMX219_REG_VALUE_08BIT, IMX219_MODE_STREAMING);
> > + if (ret < 0)
> > + goto error_power_off;
> > + usleep_range(100, 110);
> > +
> > + /* put sensor back to standby mode */
> > + ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
> > + IMX219_REG_VALUE_08BIT, IMX219_MODE_STANDBY);
> > + if (ret < 0)
> > + goto error_power_off;
> > + usleep_range(100, 110);
> > +
> > ret = imx219_init_controls(imx219);
> > if (ret)
> > goto error_power_off;
> > --
> > 2.20.1
> >